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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/http-0.2.9/src/header/name.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>name.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../http/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../http/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="kw">use </span><span class="kw">crate</span>::byte_str::ByteStr;
 <span class="kw">use </span>bytes::{Bytes, BytesMut};

 <span class="kw">use </span>std::borrow::Borrow;
 <span class="kw">use </span>std::error::Error;
 <span class="kw">use </span>std::convert::{TryFrom};
 <span class="kw">use </span>std::hash::{Hash, Hasher};
 <span class="kw">use </span>std::mem::MaybeUninit;
 <span class="kw">use </span>std::str::FromStr;
 <span class="kw">use </span>std::fmt;

 <span class="doccomment">/// Represents an HTTP header field name
 ///
 /// Header field names identify the header. Header sets may include multiple
 /// headers with the same name. The HTTP specification defines a number of
 /// standard headers, but HTTP messages may include non-standard header names as
 /// well as long as they adhere to the specification.
 ///
 /// `HeaderName` is used as the [`HeaderMap`] key. Constants are available for
 /// all standard header names in the [`header`] module.
 ///
 /// # Representation
 ///
 /// `HeaderName` represents standard header names using an `enum`, as such they
 /// will not require an allocation for storage. All custom header names are
 /// lower cased upon conversion to a `HeaderName` value. This avoids the
 /// overhead of dynamically doing lower case conversion during the hash code
 /// computation and the comparison operation.
 ///
 /// [`HeaderMap`]: struct.HeaderMap.html
 /// [`header`]: index.html
 </span><span class="attribute">#[derive(Clone, Eq, PartialEq, Hash)]
 </span><span class="kw">pub struct </span>HeaderName {
     inner: Repr&lt;Custom&gt;,
 }

 <span class="comment">// Almost a full `HeaderName`
 </span><span class="attribute">#[derive(Debug, Hash)]
 </span><span class="kw">pub struct </span>HdrName&lt;<span class="lifetime">&#39;a</span>&gt; {
     inner: Repr&lt;MaybeLower&lt;<span class="lifetime">&#39;a</span>&gt;&gt;,
 }

 <span class="attribute">#[derive(Debug, Clone, Eq, PartialEq, Hash)]
 </span><span class="kw">enum </span>Repr&lt;T&gt; {
     Standard(StandardHeader),
     Custom(T),
 }

 <span class="comment">// Used to hijack the Hash impl
 </span><span class="attribute">#[derive(Debug, Clone, Eq, PartialEq)]
 </span><span class="kw">struct </span>Custom(ByteStr);

 <span class="attribute">#[derive(Debug, Clone)]
 </span><span class="comment">// Invariant: If lower then buf is valid UTF-8.
 </span><span class="kw">struct </span>MaybeLower&lt;<span class="lifetime">&#39;a</span>&gt; {
     buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8],
     lower: bool,
 }

 <span class="doccomment">/// A possible error when converting a `HeaderName` from another type.
 </span><span class="kw">pub struct </span>InvalidHeaderName {
     _priv: (),
 }

 <span class="macro">macro_rules! </span>standard_headers {
     (
         $(
             $(<span class="attribute">#[<span class="macro-nonterminal">$docs</span>:meta]</span>)*
             (<span class="macro-nonterminal">$konst</span>:ident, <span class="macro-nonterminal">$upcase</span>:ident, <span class="macro-nonterminal">$name_bytes</span>:literal);
         )+
     ) =&gt; {
         <span class="attribute">#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
         </span><span class="kw">enum </span>StandardHeader {
             $(
                 <span class="macro-nonterminal">$konst</span>,
             )+
         }

         $(
             $(<span class="attribute">#[<span class="macro-nonterminal">$docs</span>]</span>)*
             <span class="kw">pub const </span><span class="macro-nonterminal">$upcase</span>: HeaderName = HeaderName {
                 inner: Repr::Standard(StandardHeader::<span class="macro-nonterminal">$konst</span>),
             };
         )+

         <span class="kw">impl </span>StandardHeader {
             <span class="attribute">#[inline]
             </span><span class="kw">fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str {
                 <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
                     <span class="comment">// Safety: test_parse_standard_headers ensures these &amp;[u8]s are &amp;str-safe.
                     </span>$(
                     StandardHeader::<span class="macro-nonterminal">$konst </span>=&gt; <span class="kw">unsafe </span>{ std::str::from_utf8_unchecked( <span class="macro-nonterminal">$name_bytes </span>) },
                     )+
                 }
             }

             <span class="kw">const fn </span>from_bytes(name_bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Option</span>&lt;StandardHeader&gt; {
                 <span class="kw">match </span>name_bytes {
                     $(
                         <span class="macro-nonterminal">$name_bytes </span>=&gt; <span class="prelude-val">Some</span>(StandardHeader::<span class="macro-nonterminal">$konst</span>),
                     )+
                     <span class="kw">_ </span>=&gt; <span class="prelude-val">None</span>,
                 }
             }
         }

         <span class="attribute">#[cfg(test)]
         </span><span class="kw">const </span>TEST_HEADERS: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[(StandardHeader, <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[u8])] = <span class="kw-2">&amp;</span>[
             $(
             (StandardHeader::<span class="macro-nonterminal">$konst</span>, <span class="macro-nonterminal">$name_bytes</span>),
             )+
         ];

         <span class="attribute">#[test]
         </span><span class="kw">fn </span>test_parse_standard_headers() {
             <span class="kw">for </span><span class="kw-2">&amp;</span>(std, name_bytes) <span class="kw">in </span>TEST_HEADERS {
                 <span class="comment">// Test lower case
                 </span><span class="macro">assert_eq!</span>(HeaderName::from_bytes(name_bytes).unwrap(), HeaderName::from(std));

                 <span class="comment">// Test upper case
                 </span><span class="kw">let </span>upper = std::str::from_utf8(name_bytes).expect(<span class="string">&quot;byte string constants are all utf-8&quot;</span>).to_uppercase();
                 <span class="macro">assert_eq!</span>(HeaderName::from_bytes(upper.as_bytes()).unwrap(), HeaderName::from(std));
             }
         }

         <span class="attribute">#[test]
         </span><span class="kw">fn </span>test_standard_headers_into_bytes() {
             <span class="kw">for </span><span class="kw-2">&amp;</span>(std, name_bytes) <span class="kw">in </span>TEST_HEADERS {
                 <span class="kw">let </span>name = std::str::from_utf8(name_bytes).unwrap();
                 <span class="kw">let </span>std = HeaderName::from(std);
                 <span class="comment">// Test lower case
                 </span><span class="kw">let </span>bytes: Bytes =
                     HeaderName::from_bytes(name_bytes).unwrap().inner.into();
                 <span class="macro">assert_eq!</span>(bytes, name);
                 <span class="macro">assert_eq!</span>(HeaderName::from_bytes(name_bytes).unwrap(), std);

                 <span class="comment">// Test upper case
                 </span><span class="kw">let </span>upper = name.to_uppercase();
                 <span class="kw">let </span>bytes: Bytes =
                     HeaderName::from_bytes(upper.as_bytes()).unwrap().inner.into();
                 <span class="macro">assert_eq!</span>(bytes, name_bytes);
                 <span class="macro">assert_eq!</span>(HeaderName::from_bytes(upper.as_bytes()).unwrap(),
                            std);
             }

         }
     }
 }

 <span class="comment">// Generate constants for all standard HTTP headers. This includes a static hash
 // code for the &quot;fast hash&quot; path. The hash code for static headers *do not* have
 // to match the text representation of those headers. This is because header
 // strings are always converted to the static values (when they match) before
 // being hashed. This means that it is impossible to compare the static hash
 // code of CONTENT_LENGTH with &quot;content-length&quot;.
 </span><span class="macro">standard_headers! </span>{
     <span class="doccomment">/// Advertises which content types the client is able to understand.
     ///
     /// The Accept request HTTP header advertises which content types, expressed
     /// as MIME types, the client is able to understand. Using content
     /// negotiation, the server then selects one of the proposals, uses it and
     /// informs the client of its choice with the Content-Type response header.
     /// Browsers set adequate values for this header depending of the context
     /// where the request is done: when fetching a CSS stylesheet a different
     /// value is set for the request than when fetching an image, video or a
     /// script.
     </span>(Accept, ACCEPT, <span class="string">b&quot;accept&quot;</span>);

     <span class="doccomment">/// Advertises which character set the client is able to understand.
     ///
     /// The Accept-Charset request HTTP header advertises which character set
     /// the client is able to understand. Using content negotiation, the server
     /// then selects one of the proposals, uses it and informs the client of its
     /// choice within the Content-Type response header. Browsers usually don&#39;t
     /// set this header as the default value for each content type is usually
     /// correct and transmitting it would allow easier fingerprinting.
     ///
     /// If the server cannot serve any matching character set, it can
     /// theoretically send back a 406 (Not Acceptable) error code. But, for a
     /// better user experience, this is rarely done and the more common way is
     /// to ignore the Accept-Charset header in this case.
     </span>(AcceptCharset, ACCEPT_CHARSET, <span class="string">b&quot;accept-charset&quot;</span>);

     <span class="doccomment">/// Advertises which content encoding the client is able to understand.
     ///
     /// The Accept-Encoding request HTTP header advertises which content
     /// encoding, usually a compression algorithm, the client is able to
     /// understand. Using content negotiation, the server selects one of the
     /// proposals, uses it and informs the client of its choice with the
     /// Content-Encoding response header.
     ///
     /// Even if both the client and the server supports the same compression
     /// algorithms, the server may choose not to compress the body of a
     /// response, if the identity value is also acceptable. Two common cases
     /// lead to this:
     ///
     /// * The data to be sent is already compressed and a second compression
     /// won&#39;t lead to smaller data to be transmitted. This may the case with
     /// some image formats;
     ///
     /// * The server is overloaded and cannot afford the computational overhead
     /// induced by the compression requirement. Typically, Microsoft recommends
     /// not to compress if a server use more than 80 % of its computational
     /// power.
     ///
     /// As long as the identity value, meaning no encryption, is not explicitly
     /// forbidden, by an identity;q=0 or a *;q=0 without another explicitly set
     /// value for identity, the server must never send back a 406 Not Acceptable
     /// error.
     </span>(AcceptEncoding, ACCEPT_ENCODING, <span class="string">b&quot;accept-encoding&quot;</span>);

     <span class="doccomment">/// Advertises which languages the client is able to understand.
     ///
     /// The Accept-Language request HTTP header advertises which languages the
     /// client is able to understand, and which locale variant is preferred.
     /// Using content negotiation, the server then selects one of the proposals,
     /// uses it and informs the client of its choice with the Content-Language
     /// response header. Browsers set adequate values for this header according
     /// their user interface language and even if a user can change it, this
     /// happens rarely (and is frown upon as it leads to fingerprinting).
     ///
     /// This header is a hint to be used when the server has no way of
     /// determining the language via another way, like a specific URL, that is
     /// controlled by an explicit user decision. It is recommended that the
     /// server never overrides an explicit decision. The content of the
     /// Accept-Language is often out of the control of the user (like when
     /// traveling and using an Internet Cafe in a different country); the user
     /// may also want to visit a page in another language than the locale of
     /// their user interface.
     ///
     /// If the server cannot serve any matching language, it can theoretically
     /// send back a 406 (Not Acceptable) error code. But, for a better user
     /// experience, this is rarely done and more common way is to ignore the
     /// Accept-Language header in this case.
     </span>(AcceptLanguage, ACCEPT_LANGUAGE, <span class="string">b&quot;accept-language&quot;</span>);

     <span class="doccomment">/// Marker used by the server to advertise partial request support.
     ///
     /// The Accept-Ranges response HTTP header is a marker used by the server to
     /// advertise its support of partial requests. The value of this field
     /// indicates the unit that can be used to define a range.
     ///
     /// In presence of an Accept-Ranges header, the browser may try to resume an
     /// interrupted download, rather than to start it from the start again.
     </span>(AcceptRanges, ACCEPT_RANGES, <span class="string">b&quot;accept-ranges&quot;</span>);

     <span class="doccomment">/// Preflight response indicating if the response to the request can be
     /// exposed to the page.
     ///
     /// The Access-Control-Allow-Credentials response header indicates whether
     /// or not the response to the request can be exposed to the page. It can be
     /// exposed when the true value is returned; it can&#39;t in other cases.
     ///
     /// Credentials are cookies, authorization headers or TLS client
     /// certificates.
     ///
     /// When used as part of a response to a preflight request, this indicates
     /// whether or not the actual request can be made using credentials. Note
     /// that simple GET requests are not preflighted, and so if a request is
     /// made for a resource with credentials, if this header is not returned
     /// with the resource, the response is ignored by the browser and not
     /// returned to web content.
     ///
     /// The Access-Control-Allow-Credentials header works in conjunction with
     /// the XMLHttpRequest.withCredentials property or with the credentials
     /// option in the Request() constructor of the Fetch API. Credentials must
     /// be set on both sides (the Access-Control-Allow-Credentials header and in
     /// the XHR or Fetch request) in order for the CORS request with credentials
     /// to succeed.
     </span>(AccessControlAllowCredentials, ACCESS_CONTROL_ALLOW_CREDENTIALS, <span class="string">b&quot;access-control-allow-credentials&quot;</span>);

     <span class="doccomment">/// Preflight response indicating permitted HTTP headers.
     ///
     /// The Access-Control-Allow-Headers response header is used in response to
     /// a preflight request to indicate which HTTP headers will be available via
     /// Access-Control-Expose-Headers when making the actual request.
     ///
     /// The simple headers, Accept, Accept-Language, Content-Language,
     /// Content-Type (but only with a MIME type of its parsed value (ignoring
     /// parameters) of either application/x-www-form-urlencoded,
     /// multipart/form-data, or text/plain), are always available and don&#39;t need
     /// to be listed by this header.
     ///
     /// This header is required if the request has an
     /// Access-Control-Request-Headers header.
     </span>(AccessControlAllowHeaders, ACCESS_CONTROL_ALLOW_HEADERS, <span class="string">b&quot;access-control-allow-headers&quot;</span>);

     <span class="doccomment">/// Preflight header response indicating permitted access methods.
     ///
     /// The Access-Control-Allow-Methods response header specifies the method or
     /// methods allowed when accessing the resource in response to a preflight
     /// request.
     </span>(AccessControlAllowMethods, ACCESS_CONTROL_ALLOW_METHODS, <span class="string">b&quot;access-control-allow-methods&quot;</span>);

     <span class="doccomment">/// Indicates whether the response can be shared with resources with the
     /// given origin.
     </span>(AccessControlAllowOrigin, ACCESS_CONTROL_ALLOW_ORIGIN, <span class="string">b&quot;access-control-allow-origin&quot;</span>);

     <span class="doccomment">/// Indicates which headers can be exposed as part of the response by
     /// listing their names.
     </span>(AccessControlExposeHeaders, ACCESS_CONTROL_EXPOSE_HEADERS, <span class="string">b&quot;access-control-expose-headers&quot;</span>);

     <span class="doccomment">/// Indicates how long the results of a preflight request can be cached.
     </span>(AccessControlMaxAge, ACCESS_CONTROL_MAX_AGE, <span class="string">b&quot;access-control-max-age&quot;</span>);

     <span class="doccomment">/// Informs the server which HTTP headers will be used when an actual
     /// request is made.
     </span>(AccessControlRequestHeaders, ACCESS_CONTROL_REQUEST_HEADERS, <span class="string">b&quot;access-control-request-headers&quot;</span>);

     <span class="doccomment">/// Informs the server know which HTTP method will be used when the actual
     /// request is made.
     </span>(AccessControlRequestMethod, ACCESS_CONTROL_REQUEST_METHOD, <span class="string">b&quot;access-control-request-method&quot;</span>);

     <span class="doccomment">/// Indicates the time in seconds the object has been in a proxy cache.
     ///
     /// The Age header is usually close to zero. If it is Age: 0, it was
     /// probably just fetched from the origin server; otherwise It is usually
     /// calculated as a difference between the proxy&#39;s current date and the Date
     /// general header included in the HTTP response.
     </span>(Age, AGE, <span class="string">b&quot;age&quot;</span>);

     <span class="doccomment">/// Lists the set of methods support by a resource.
     ///
     /// This header must be sent if the server responds with a 405 Method Not
     /// Allowed status code to indicate which request methods can be used. An
     /// empty Allow header indicates that the resource allows no request
     /// methods, which might occur temporarily for a given resource, for
     /// example.
     </span>(Allow, ALLOW, <span class="string">b&quot;allow&quot;</span>);

     <span class="doccomment">/// Advertises the availability of alternate services to clients.
     </span>(AltSvc, ALT_SVC, <span class="string">b&quot;alt-svc&quot;</span>);

     <span class="doccomment">/// Contains the credentials to authenticate a user agent with a server.
     ///
     /// Usually this header is included after the server has responded with a
     /// 401 Unauthorized status and the WWW-Authenticate header.
     </span>(Authorization, AUTHORIZATION, <span class="string">b&quot;authorization&quot;</span>);

     <span class="doccomment">/// Specifies directives for caching mechanisms in both requests and
     /// responses.
     ///
     /// Caching directives are unidirectional, meaning that a given directive in
     /// a request is not implying that the same directive is to be given in the
     /// response.
     </span>(CacheControl, CACHE_CONTROL, <span class="string">b&quot;cache-control&quot;</span>);

     <span class="doccomment">/// Indicates how caches have handled a response and its corresponding request.
     ///
     /// See [RFC 9211](https://www.rfc-editor.org/rfc/rfc9211.html).
     </span>(CacheStatus, CACHE_STATUS, <span class="string">b&quot;cache-status&quot;</span>);

     <span class="doccomment">/// Specifies directives that allow origin servers to control the behavior of CDN caches
     /// interposed between them and clients separately from other caches that might handle the
     /// response.
     ///
     /// See [RFC 9213](https://www.rfc-editor.org/rfc/rfc9213.html).
     </span>(CdnCacheControl, CDN_CACHE_CONTROL, <span class="string">b&quot;cdn-cache-control&quot;</span>);

     <span class="doccomment">/// Controls whether or not the network connection stays open after the
     /// current transaction finishes.
     ///
     /// If the value sent is keep-alive, the connection is persistent and not
     /// closed, allowing for subsequent requests to the same server to be done.
     ///
     /// Except for the standard hop-by-hop headers (Keep-Alive,
     /// Transfer-Encoding, TE, Connection, Trailer, Upgrade, Proxy-Authorization
     /// and Proxy-Authenticate), any hop-by-hop headers used by the message must
     /// be listed in the Connection header, so that the first proxy knows he has
     /// to consume them and not to forward them further. Standard hop-by-hop
     /// headers can be listed too (it is often the case of Keep-Alive, but this
     /// is not mandatory.
     </span>(Connection, CONNECTION, <span class="string">b&quot;connection&quot;</span>);

     <span class="doccomment">/// Indicates if the content is expected to be displayed inline.
     ///
     /// In a regular HTTP response, the Content-Disposition response header is a
     /// header indicating if the content is expected to be displayed inline in
     /// the browser, that is, as a Web page or as part of a Web page, or as an
     /// attachment, that is downloaded and saved locally.
     ///
     /// In a multipart/form-data body, the HTTP Content-Disposition general
     /// header is a header that can be used on the subpart of a multipart body
     /// to give information about the field it applies to. The subpart is
     /// delimited by the boundary defined in the Content-Type header. Used on
     /// the body itself, Content-Disposition has no effect.
     ///
     /// The Content-Disposition header is defined in the larger context of MIME
     /// messages for e-mail, but only a subset of the possible parameters apply
     /// to HTTP forms and POST requests. Only the value form-data, as well as
     /// the optional directive name and filename, can be used in the HTTP
     /// context.
     </span>(ContentDisposition, CONTENT_DISPOSITION, <span class="string">b&quot;content-disposition&quot;</span>);

     <span class="doccomment">/// Used to compress the media-type.
     ///
     /// When present, its value indicates what additional content encoding has
     /// been applied to the entity-body. It lets the client know, how to decode
     /// in order to obtain the media-type referenced by the Content-Type header.
     ///
     /// It is recommended to compress data as much as possible and therefore to
     /// use this field, but some types of resources, like jpeg images, are
     /// already compressed.  Sometimes using additional compression doesn&#39;t
     /// reduce payload size and can even make the payload longer.
     </span>(ContentEncoding, CONTENT_ENCODING, <span class="string">b&quot;content-encoding&quot;</span>);

     <span class="doccomment">/// Used to describe the languages intended for the audience.
     ///
     /// This header allows a user to differentiate according to the users&#39; own
     /// preferred language. For example, if &quot;Content-Language: de-DE&quot; is set, it
     /// says that the document is intended for German language speakers
     /// (however, it doesn&#39;t indicate the document is written in German. For
     /// example, it might be written in English as part of a language course for
     /// German speakers).
     ///
     /// If no Content-Language is specified, the default is that the content is
     /// intended for all language audiences. Multiple language tags are also
     /// possible, as well as applying the Content-Language header to various
     /// media types and not only to textual documents.
     </span>(ContentLanguage, CONTENT_LANGUAGE, <span class="string">b&quot;content-language&quot;</span>);

     <span class="doccomment">/// Indicates the size of the entity-body.
     ///
     /// The header value must be a decimal indicating the number of octets sent
     /// to the recipient.
     </span>(ContentLength, CONTENT_LENGTH, <span class="string">b&quot;content-length&quot;</span>);

     <span class="doccomment">/// Indicates an alternate location for the returned data.
     ///
     /// The principal use case is to indicate the URL of the resource
     /// transmitted as the result of content negotiation.
     ///
     /// Location and Content-Location are different: Location indicates the
     /// target of a redirection (or the URL of a newly created document), while
     /// Content-Location indicates the direct URL to use to access the resource,
     /// without the need of further content negotiation. Location is a header
     /// associated with the response, while Content-Location is associated with
     /// the entity returned.
     </span>(ContentLocation, CONTENT_LOCATION, <span class="string">b&quot;content-location&quot;</span>);

     <span class="doccomment">/// Indicates where in a full body message a partial message belongs.
     </span>(ContentRange, CONTENT_RANGE, <span class="string">b&quot;content-range&quot;</span>);

     <span class="doccomment">/// Allows controlling resources the user agent is allowed to load for a
     /// given page.
     ///
     /// With a few exceptions, policies mostly involve specifying server origins
     /// and script endpoints. This helps guard against cross-site scripting
     /// attacks (XSS).
     </span>(ContentSecurityPolicy, CONTENT_SECURITY_POLICY, <span class="string">b&quot;content-security-policy&quot;</span>);

     <span class="doccomment">/// Allows experimenting with policies by monitoring their effects.
     ///
     /// The HTTP Content-Security-Policy-Report-Only response header allows web
     /// developers to experiment with policies by monitoring (but not enforcing)
     /// their effects. These violation reports consist of JSON documents sent
     /// via an HTTP POST request to the specified URI.
     </span>(ContentSecurityPolicyReportOnly, CONTENT_SECURITY_POLICY_REPORT_ONLY, <span class="string">b&quot;content-security-policy-report-only&quot;</span>);

     <span class="doccomment">/// Used to indicate the media type of the resource.
     ///
     /// In responses, a Content-Type header tells the client what the content
     /// type of the returned content actually is. Browsers will do MIME sniffing
     /// in some cases and will not necessarily follow the value of this header;
     /// to prevent this behavior, the header X-Content-Type-Options can be set
     /// to nosniff.
     ///
     /// In requests, (such as POST or PUT), the client tells the server what
     /// type of data is actually sent.
     </span>(ContentType, CONTENT_TYPE, <span class="string">b&quot;content-type&quot;</span>);

     <span class="doccomment">/// Contains stored HTTP cookies previously sent by the server with the
     /// Set-Cookie header.
     ///
     /// The Cookie header might be omitted entirely, if the privacy setting of
     /// the browser are set to block them, for example.
     </span>(Cookie, COOKIE, <span class="string">b&quot;cookie&quot;</span>);

     <span class="doccomment">/// Indicates the client&#39;s tracking preference.
     ///
     /// This header lets users indicate whether they would prefer privacy rather
     /// than personalized content.
     </span>(Dnt, DNT, <span class="string">b&quot;dnt&quot;</span>);

     <span class="doccomment">/// Contains the date and time at which the message was originated.
     </span>(Date, DATE, <span class="string">b&quot;date&quot;</span>);

     <span class="doccomment">/// Identifier for a specific version of a resource.
     ///
     /// This header allows caches to be more efficient, and saves bandwidth, as
     /// a web server does not need to send a full response if the content has
     /// not changed. On the other side, if the content has changed, etags are
     /// useful to help prevent simultaneous updates of a resource from
     /// overwriting each other (&quot;mid-air collisions&quot;).
     ///
     /// If the resource at a given URL changes, a new Etag value must be
     /// generated. Etags are therefore similar to fingerprints and might also be
     /// used for tracking purposes by some servers. A comparison of them allows
     /// to quickly determine whether two representations of a resource are the
     /// same, but they might also be set to persist indefinitely by a tracking
     /// server.
     </span>(Etag, ETAG, <span class="string">b&quot;etag&quot;</span>);

     <span class="doccomment">/// Indicates expectations that need to be fulfilled by the server in order
     /// to properly handle the request.
     ///
     /// The only expectation defined in the specification is Expect:
     /// 100-continue, to which the server shall respond with:
     ///
     /// * 100 if the information contained in the header is sufficient to cause
     /// an immediate success,
     ///
     /// * 417 (Expectation Failed) if it cannot meet the expectation; or any
     /// other 4xx status otherwise.
     ///
     /// For example, the server may reject a request if its Content-Length is
     /// too large.
     ///
     /// No common browsers send the Expect header, but some other clients such
     /// as cURL do so by default.
     </span>(Expect, EXPECT, <span class="string">b&quot;expect&quot;</span>);

     <span class="doccomment">/// Contains the date/time after which the response is considered stale.
     ///
     /// Invalid dates, like the value 0, represent a date in the past and mean
     /// that the resource is already expired.
     ///
     /// If there is a Cache-Control header with the &quot;max-age&quot; or &quot;s-max-age&quot;
     /// directive in the response, the Expires header is ignored.
     </span>(Expires, EXPIRES, <span class="string">b&quot;expires&quot;</span>);

     <span class="doccomment">/// Contains information from the client-facing side of proxy servers that
     /// is altered or lost when a proxy is involved in the path of the request.
     ///
     /// The alternative and de-facto standard versions of this header are the
     /// X-Forwarded-For, X-Forwarded-Host and X-Forwarded-Proto headers.
     ///
     /// This header is used for debugging, statistics, and generating
     /// location-dependent content and by design it exposes privacy sensitive
     /// information, such as the IP address of the client. Therefore the user&#39;s
     /// privacy must be kept in mind when deploying this header.
     </span>(Forwarded, FORWARDED, <span class="string">b&quot;forwarded&quot;</span>);

     <span class="doccomment">/// Contains an Internet email address for a human user who controls the
     /// requesting user agent.
     ///
     /// If you are running a robotic user agent (e.g. a crawler), the From
     /// header should be sent, so you can be contacted if problems occur on
     /// servers, such as if the robot is sending excessive, unwanted, or invalid
     /// requests.
     </span>(From, FROM, <span class="string">b&quot;from&quot;</span>);

     <span class="doccomment">/// Specifies the domain name of the server and (optionally) the TCP port
     /// number on which the server is listening.
     ///
     /// If no port is given, the default port for the service requested (e.g.,
     /// &quot;80&quot; for an HTTP URL) is implied.
     ///
     /// A Host header field must be sent in all HTTP/1.1 request messages. A 400
     /// (Bad Request) status code will be sent to any HTTP/1.1 request message
     /// that lacks a Host header field or contains more than one.
     </span>(Host, HOST, <span class="string">b&quot;host&quot;</span>);

     <span class="doccomment">/// Makes a request conditional based on the E-Tag.
     ///
     /// For GET and HEAD methods, the server will send back the requested
     /// resource only if it matches one of the listed ETags. For PUT and other
     /// non-safe methods, it will only upload the resource in this case.
     ///
     /// The comparison with the stored ETag uses the strong comparison
     /// algorithm, meaning two files are considered identical byte to byte only.
     /// This is weakened when the  W/ prefix is used in front of the ETag.
     ///
     /// There are two common use cases:
     ///
     /// * For GET and HEAD methods, used in combination with an Range header, it
     /// can guarantee that the new ranges requested comes from the same resource
     /// than the previous one. If it doesn&#39;t match, then a 416 (Range Not
     /// Satisfiable) response is returned.
     ///
     /// * For other methods, and in particular for PUT, If-Match can be used to
     /// prevent the lost update problem. It can check if the modification of a
     /// resource that the user wants to upload will not override another change
     /// that has been done since the original resource was fetched. If the
     /// request cannot be fulfilled, the 412 (Precondition Failed) response is
     /// returned.
     </span>(IfMatch, IF_MATCH, <span class="string">b&quot;if-match&quot;</span>);

     <span class="doccomment">/// Makes a request conditional based on the modification date.
     ///
     /// The If-Modified-Since request HTTP header makes the request conditional:
     /// the server will send back the requested resource, with a 200 status,
     /// only if it has been last modified after the given date. If the request
     /// has not been modified since, the response will be a 304 without any
     /// body; the Last-Modified header will contain the date of last
     /// modification. Unlike If-Unmodified-Since, If-Modified-Since can only be
     /// used with a GET or HEAD.
     ///
     /// When used in combination with If-None-Match, it is ignored, unless the
     /// server doesn&#39;t support If-None-Match.
     ///
     /// The most common use case is to update a cached entity that has no
     /// associated ETag.
     </span>(IfModifiedSince, IF_MODIFIED_SINCE, <span class="string">b&quot;if-modified-since&quot;</span>);

     <span class="doccomment">/// Makes a request conditional based on the E-Tag.
     ///
     /// The If-None-Match HTTP request header makes the request conditional. For
     /// GET and HEAD methods, the server will send back the requested resource,
     /// with a 200 status, only if it doesn&#39;t have an ETag matching the given
     /// ones. For other methods, the request will be processed only if the
     /// eventually existing resource&#39;s ETag doesn&#39;t match any of the values
     /// listed.
     ///
     /// When the condition fails for GET and HEAD methods, then the server must
     /// return HTTP status code 304 (Not Modified). For methods that apply
     /// server-side changes, the status code 412 (Precondition Failed) is used.
     /// Note that the server generating a 304 response MUST generate any of the
     /// following header fields that would have been sent in a 200 (OK) response
     /// to the same request: Cache-Control, Content-Location, Date, ETag,
     /// Expires, and Vary.
     ///
     /// The comparison with the stored ETag uses the weak comparison algorithm,
     /// meaning two files are considered identical not only if they are
     /// identical byte to byte, but if the content is equivalent. For example,
     /// two pages that would differ only by the date of generation in the footer
     /// would be considered as identical.
     ///
     /// When used in combination with If-Modified-Since, it has precedence (if
     /// the server supports it).
     ///
     /// There are two common use cases:
     ///
     /// * For `GET` and `HEAD` methods, to update a cached entity that has an associated ETag.
     /// * For other methods, and in particular for `PUT`, `If-None-Match` used with
     /// the `*` value can be used to save a file not known to exist,
     /// guaranteeing that another upload didn&#39;t happen before, losing the data
     /// of the previous put; this problems is the variation of the lost update
     /// problem.
     </span>(IfNoneMatch, IF_NONE_MATCH, <span class="string">b&quot;if-none-match&quot;</span>);

     <span class="doccomment">/// Makes a request conditional based on range.
     ///
     /// The If-Range HTTP request header makes a range request conditional: if
     /// the condition is fulfilled, the range request will be issued and the
     /// server sends back a 206 Partial Content answer with the appropriate
     /// body. If the condition is not fulfilled, the full resource is sent back,
     /// with a 200 OK status.
     ///
     /// This header can be used either with a Last-Modified validator, or with
     /// an ETag, but not with both.
     ///
     /// The most common use case is to resume a download, to guarantee that the
     /// stored resource has not been modified since the last fragment has been
     /// received.
     </span>(IfRange, IF_RANGE, <span class="string">b&quot;if-range&quot;</span>);

     <span class="doccomment">/// Makes the request conditional based on the last modification date.
     ///
     /// The If-Unmodified-Since request HTTP header makes the request
     /// conditional: the server will send back the requested resource, or accept
     /// it in the case of a POST or another non-safe method, only if it has not
     /// been last modified after the given date. If the request has been
     /// modified after the given date, the response will be a 412 (Precondition
     /// Failed) error.
     ///
     /// There are two common use cases:
     ///
     /// * In conjunction non-safe methods, like POST, it can be used to
     /// implement an optimistic concurrency control, like done by some wikis:
     /// editions are rejected if the stored document has been modified since the
     /// original has been retrieved.
     ///
     /// * In conjunction with a range request with a If-Range header, it can be
     /// used to ensure that the new fragment requested comes from an unmodified
     /// document.
     </span>(IfUnmodifiedSince, IF_UNMODIFIED_SINCE, <span class="string">b&quot;if-unmodified-since&quot;</span>);

     <span class="doccomment">/// Content-Types that are acceptable for the response.
     </span>(LastModified, LAST_MODIFIED, <span class="string">b&quot;last-modified&quot;</span>);

     <span class="doccomment">/// Allows the server to point an interested client to another resource
     /// containing metadata about the requested resource.
     </span>(Link, LINK, <span class="string">b&quot;link&quot;</span>);

     <span class="doccomment">/// Indicates the URL to redirect a page to.
     ///
     /// The Location response header indicates the URL to redirect a page to. It
     /// only provides a meaning when served with a 3xx status response.
     ///
     /// The HTTP method used to make the new request to fetch the page pointed
     /// to by Location depends of the original method and of the kind of
     /// redirection:
     ///
     /// * If 303 (See Also) responses always lead to the use of a GET method,
     /// 307 (Temporary Redirect) and 308 (Permanent Redirect) don&#39;t change the
     /// method used in the original request;
     ///
     /// * 301 (Permanent Redirect) and 302 (Found) doesn&#39;t change the method
     /// most of the time, though older user-agents may (so you basically don&#39;t
     /// know).
     ///
     /// All responses with one of these status codes send a Location header.
     ///
     /// Beside redirect response, messages with 201 (Created) status also
     /// include the Location header. It indicates the URL to the newly created
     /// resource.
     ///
     /// Location and Content-Location are different: Location indicates the
     /// target of a redirection (or the URL of a newly created resource), while
     /// Content-Location indicates the direct URL to use to access the resource
     /// when content negotiation happened, without the need of further content
     /// negotiation. Location is a header associated with the response, while
     /// Content-Location is associated with the entity returned.
     </span>(Location, LOCATION, <span class="string">b&quot;location&quot;</span>);

     <span class="doccomment">/// Indicates the max number of intermediaries the request should be sent
     /// through.
     </span>(MaxForwards, MAX_FORWARDS, <span class="string">b&quot;max-forwards&quot;</span>);

     <span class="doccomment">/// Indicates where a fetch originates from.
     ///
     /// It doesn&#39;t include any path information, but only the server name. It is
     /// sent with CORS requests, as well as with POST requests. It is similar to
     /// the Referer header, but, unlike this header, it doesn&#39;t disclose the
     /// whole path.
     </span>(Origin, ORIGIN, <span class="string">b&quot;origin&quot;</span>);

     <span class="doccomment">/// HTTP/1.0 header usually used for backwards compatibility.
     ///
     /// The Pragma HTTP/1.0 general header is an implementation-specific header
     /// that may have various effects along the request-response chain. It is
     /// used for backwards compatibility with HTTP/1.0 caches where the
     /// Cache-Control HTTP/1.1 header is not yet present.
     </span>(Pragma, PRAGMA, <span class="string">b&quot;pragma&quot;</span>);

     <span class="doccomment">/// Defines the authentication method that should be used to gain access to
     /// a proxy.
     ///
     /// Unlike `www-authenticate`, the `proxy-authenticate` header field applies
     /// only to the next outbound client on the response chain. This is because
     /// only the client that chose a given proxy is likely to have the
     /// credentials necessary for authentication. However, when multiple proxies
     /// are used within the same administrative domain, such as office and
     /// regional caching proxies within a large corporate network, it is common
     /// for credentials to be generated by the user agent and passed through the
     /// hierarchy until consumed. Hence, in such a configuration, it will appear
     /// as if Proxy-Authenticate is being forwarded because each proxy will send
     /// the same challenge set.
     ///
     /// The `proxy-authenticate` header is sent along with a `407 Proxy
     /// Authentication Required`.
     </span>(ProxyAuthenticate, PROXY_AUTHENTICATE, <span class="string">b&quot;proxy-authenticate&quot;</span>);

     <span class="doccomment">/// Contains the credentials to authenticate a user agent to a proxy server.
     ///
     /// This header is usually included after the server has responded with a
     /// 407 Proxy Authentication Required status and the Proxy-Authenticate
     /// header.
     </span>(ProxyAuthorization, PROXY_AUTHORIZATION, <span class="string">b&quot;proxy-authorization&quot;</span>);

     <span class="doccomment">/// Associates a specific cryptographic public key with a certain server.
     ///
     /// This decreases the risk of MITM attacks with forged certificates. If one
     /// or several keys are pinned and none of them are used by the server, the
     /// browser will not accept the response as legitimate, and will not display
     /// it.
     </span>(PublicKeyPins, PUBLIC_KEY_PINS, <span class="string">b&quot;public-key-pins&quot;</span>);

     <span class="doccomment">/// Sends reports of pinning violation to the report-uri specified in the
     /// header.
     ///
     /// Unlike `Public-Key-Pins`, this header still allows browsers to connect
     /// to the server if the pinning is violated.
     </span>(PublicKeyPinsReportOnly, PUBLIC_KEY_PINS_REPORT_ONLY, <span class="string">b&quot;public-key-pins-report-only&quot;</span>);

     <span class="doccomment">/// Indicates the part of a document that the server should return.
     ///
     /// Several parts can be requested with one Range header at once, and the
     /// server may send back these ranges in a multipart document. If the server
     /// sends back ranges, it uses the 206 Partial Content for the response. If
     /// the ranges are invalid, the server returns the 416 Range Not Satisfiable
     /// error. The server can also ignore the Range header and return the whole
     /// document with a 200 status code.
     </span>(Range, RANGE, <span class="string">b&quot;range&quot;</span>);

     <span class="doccomment">/// Contains the address of the previous web page from which a link to the
     /// currently requested page was followed.
     ///
     /// The Referer header allows servers to identify where people are visiting
     /// them from and may use that data for analytics, logging, or optimized
     /// caching, for example.
     </span>(Referer, REFERER, <span class="string">b&quot;referer&quot;</span>);

     <span class="doccomment">/// Governs which referrer information should be included with requests
     /// made.
     </span>(ReferrerPolicy, REFERRER_POLICY, <span class="string">b&quot;referrer-policy&quot;</span>);

     <span class="doccomment">/// Informs the web browser that the current page or frame should be
     /// refreshed.
     </span>(Refresh, REFRESH, <span class="string">b&quot;refresh&quot;</span>);

     <span class="doccomment">/// The Retry-After response HTTP header indicates how long the user agent
     /// should wait before making a follow-up request. There are two main cases
     /// this header is used:
     ///
     /// * When sent with a 503 (Service Unavailable) response, it indicates how
     /// long the service is expected to be unavailable.
     ///
     /// * When sent with a redirect response, such as 301 (Moved Permanently),
     /// it indicates the minimum time that the user agent is asked to wait
     /// before issuing the redirected request.
     </span>(RetryAfter, RETRY_AFTER, <span class="string">b&quot;retry-after&quot;</span>);

     <span class="doccomment">/// The |Sec-WebSocket-Accept| header field is used in the WebSocket
     /// opening handshake. It is sent from the server to the client to
     /// confirm that the server is willing to initiate the WebSocket
     /// connection.
     </span>(SecWebSocketAccept, SEC_WEBSOCKET_ACCEPT, <span class="string">b&quot;sec-websocket-accept&quot;</span>);

     <span class="doccomment">/// The |Sec-WebSocket-Extensions| header field is used in the WebSocket
     /// opening handshake. It is initially sent from the client to the
     /// server, and then subsequently sent from the server to the client, to
     /// agree on a set of protocol-level extensions to use for the duration
     /// of the connection.
     </span>(SecWebSocketExtensions, SEC_WEBSOCKET_EXTENSIONS, <span class="string">b&quot;sec-websocket-extensions&quot;</span>);

     <span class="doccomment">/// The |Sec-WebSocket-Key| header field is used in the WebSocket opening
     /// handshake. It is sent from the client to the server to provide part
     /// of the information used by the server to prove that it received a
     /// valid WebSocket opening handshake. This helps ensure that the server
     /// does not accept connections from non-WebSocket clients (e.g., HTTP
     /// clients) that are being abused to send data to unsuspecting WebSocket
     /// servers.
     </span>(SecWebSocketKey, SEC_WEBSOCKET_KEY, <span class="string">b&quot;sec-websocket-key&quot;</span>);

     <span class="doccomment">/// The |Sec-WebSocket-Protocol| header field is used in the WebSocket
     /// opening handshake. It is sent from the client to the server and back
     /// from the server to the client to confirm the subprotocol of the
     /// connection.  This enables scripts to both select a subprotocol and be
     /// sure that the server agreed to serve that subprotocol.
     </span>(SecWebSocketProtocol, SEC_WEBSOCKET_PROTOCOL, <span class="string">b&quot;sec-websocket-protocol&quot;</span>);

     <span class="doccomment">/// The |Sec-WebSocket-Version| header field is used in the WebSocket
     /// opening handshake.  It is sent from the client to the server to
     /// indicate the protocol version of the connection.  This enables
     /// servers to correctly interpret the opening handshake and subsequent
     /// data being sent from the data, and close the connection if the server
     /// cannot interpret that data in a safe manner.
     </span>(SecWebSocketVersion, SEC_WEBSOCKET_VERSION, <span class="string">b&quot;sec-websocket-version&quot;</span>);

     <span class="doccomment">/// Contains information about the software used by the origin server to
     /// handle the request.
     ///
     /// Overly long and detailed Server values should be avoided as they
     /// potentially reveal internal implementation details that might make it
     /// (slightly) easier for attackers to find and exploit known security
     /// holes.
     </span>(Server, SERVER, <span class="string">b&quot;server&quot;</span>);

     <span class="doccomment">/// Used to send cookies from the server to the user agent.
     </span>(SetCookie, SET_COOKIE, <span class="string">b&quot;set-cookie&quot;</span>);

     <span class="doccomment">/// Tells the client to communicate with HTTPS instead of using HTTP.
     </span>(StrictTransportSecurity, STRICT_TRANSPORT_SECURITY, <span class="string">b&quot;strict-transport-security&quot;</span>);

     <span class="doccomment">/// Informs the server of transfer encodings willing to be accepted as part
     /// of the response.
     ///
     /// See also the Transfer-Encoding response header for more details on
     /// transfer encodings. Note that chunked is always acceptable for HTTP/1.1
     /// recipients and you that don&#39;t have to specify &quot;chunked&quot; using the TE
     /// header. However, it is useful for setting if the client is accepting
     /// trailer fields in a chunked transfer coding using the &quot;trailers&quot; value.
     </span>(Te, TE, <span class="string">b&quot;te&quot;</span>);

     <span class="doccomment">/// Allows the sender to include additional fields at the end of chunked
     /// messages.
     </span>(Trailer, TRAILER, <span class="string">b&quot;trailer&quot;</span>);

     <span class="doccomment">/// Specifies the form of encoding used to safely transfer the entity to the
     /// client.
     ///
     /// `transfer-encoding` is a hop-by-hop header, that is applying to a
     /// message between two nodes, not to a resource itself. Each segment of a
     /// multi-node connection can use different `transfer-encoding` values. If
     /// you want to compress data over the whole connection, use the end-to-end
     /// header `content-encoding` header instead.
     ///
     /// When present on a response to a `HEAD` request that has no body, it
     /// indicates the value that would have applied to the corresponding `GET`
     /// message.
     </span>(TransferEncoding, TRANSFER_ENCODING, <span class="string">b&quot;transfer-encoding&quot;</span>);

     <span class="doccomment">/// Contains a string that allows identifying the requesting client&#39;s
     /// software.
     </span>(UserAgent, USER_AGENT, <span class="string">b&quot;user-agent&quot;</span>);

     <span class="doccomment">/// Used as part of the exchange to upgrade the protocol.
     </span>(Upgrade, UPGRADE, <span class="string">b&quot;upgrade&quot;</span>);

     <span class="doccomment">/// Sends a signal to the server expressing the client’s preference for an
     /// encrypted and authenticated response.
     </span>(UpgradeInsecureRequests, UPGRADE_INSECURE_REQUESTS, <span class="string">b&quot;upgrade-insecure-requests&quot;</span>);

     <span class="doccomment">/// Determines how to match future requests with cached responses.
     ///
     /// The `vary` HTTP response header determines how to match future request
     /// headers to decide whether a cached response can be used rather than
     /// requesting a fresh one from the origin server. It is used by the server
     /// to indicate which headers it used when selecting a representation of a
     /// resource in a content negotiation algorithm.
     ///
     /// The `vary` header should be set on a 304 Not Modified response exactly
     /// like it would have been set on an equivalent 200 OK response.
     </span>(Vary, VARY, <span class="string">b&quot;vary&quot;</span>);

     <span class="doccomment">/// Added by proxies to track routing.
     ///
     /// The `via` general header is added by proxies, both forward and reverse
     /// proxies, and can appear in the request headers and the response headers.
     /// It is used for tracking message forwards, avoiding request loops, and
     /// identifying the protocol capabilities of senders along the
     /// request/response chain.
     </span>(Via, VIA, <span class="string">b&quot;via&quot;</span>);

     <span class="doccomment">/// General HTTP header contains information about possible problems with
     /// the status of the message.
     ///
     /// More than one `warning` header may appear in a response. Warning header
     /// fields can in general be applied to any message, however some warn-codes
     /// are specific to caches and can only be applied to response messages.
     </span>(Warning, WARNING, <span class="string">b&quot;warning&quot;</span>);

     <span class="doccomment">/// Defines the authentication method that should be used to gain access to
     /// a resource.
     </span>(WwwAuthenticate, WWW_AUTHENTICATE, <span class="string">b&quot;www-authenticate&quot;</span>);

     <span class="doccomment">/// Marker used by the server to indicate that the MIME types advertised in
     /// the `content-type` headers should not be changed and be followed.
     ///
     /// This allows to opt-out of MIME type sniffing, or, in other words, it is
     /// a way to say that the webmasters knew what they were doing.
     ///
     /// This header was introduced by Microsoft in IE 8 as a way for webmasters
     /// to block content sniffing that was happening and could transform
     /// non-executable MIME types into executable MIME types. Since then, other
     /// browsers have introduced it, even if their MIME sniffing algorithms were
     /// less aggressive.
     ///
     /// Site security testers usually expect this header to be set.
     </span>(XContentTypeOptions, X_CONTENT_TYPE_OPTIONS, <span class="string">b&quot;x-content-type-options&quot;</span>);

     <span class="doccomment">/// Controls DNS prefetching.
     ///
     /// The `x-dns-prefetch-control` HTTP response header controls DNS
     /// prefetching, a feature by which browsers proactively perform domain name
     /// resolution on both links that the user may choose to follow as well as
     /// URLs for items referenced by the document, including images, CSS,
     /// JavaScript, and so forth.
     ///
     /// This prefetching is performed in the background, so that the DNS is
     /// likely to have been resolved by the time the referenced items are
     /// needed. This reduces latency when the user clicks a link.
     </span>(XDnsPrefetchControl, X_DNS_PREFETCH_CONTROL, <span class="string">b&quot;x-dns-prefetch-control&quot;</span>);

     <span class="doccomment">/// Indicates whether or not a browser should be allowed to render a page in
     /// a frame.
     ///
     /// Sites can use this to avoid clickjacking attacks, by ensuring that their
     /// content is not embedded into other sites.
     ///
     /// The added security is only provided if the user accessing the document
     /// is using a browser supporting `x-frame-options`.
     </span>(XFrameOptions, X_FRAME_OPTIONS, <span class="string">b&quot;x-frame-options&quot;</span>);

     <span class="doccomment">/// Stop pages from loading when an XSS attack is detected.
     ///
     /// The HTTP X-XSS-Protection response header is a feature of Internet
     /// Explorer, Chrome and Safari that stops pages from loading when they
     /// detect reflected cross-site scripting (XSS) attacks. Although these
     /// protections are largely unnecessary in modern browsers when sites
     /// implement a strong Content-Security-Policy that disables the use of
     /// inline JavaScript (&#39;unsafe-inline&#39;), they can still provide protections
     /// for users of older web browsers that don&#39;t yet support CSP.
     </span>(XXssProtection, X_XSS_PROTECTION, <span class="string">b&quot;x-xss-protection&quot;</span>);
 }

 <span class="doccomment">/// Valid header name characters
 ///
 /// ```not_rust
 ///       field-name     = token
 ///       separators     = &quot;(&quot; | &quot;)&quot; | &quot;&lt;&quot; | &quot;&gt;&quot; | &quot;@&quot;
 ///                      | &quot;,&quot; | &quot;;&quot; | &quot;:&quot; | &quot;\&quot; | &lt;&quot;&gt;
 ///                      | &quot;/&quot; | &quot;[&quot; | &quot;]&quot; | &quot;?&quot; | &quot;=&quot;
 ///                      | &quot;{&quot; | &quot;}&quot; | SP | HT
 ///       token          = 1*tchar
 ///       tchar          = &quot;!&quot; / &quot;#&quot; / &quot;$&quot; / &quot;%&quot; / &quot;&amp;&quot; / &quot;&#39;&quot; / &quot;*&quot;
 ///                      / &quot;+&quot; / &quot;-&quot; / &quot;.&quot; / &quot;^&quot; / &quot;_&quot; / &quot;`&quot; / &quot;|&quot; / &quot;~&quot;
 ///                      / DIGIT / ALPHA
 ///                      ; any VCHAR, except delimiters
 /// ```
 </span><span class="comment">// HEADER_CHARS maps every byte that is 128 or larger to 0 so everything that is
 // mapped by HEADER_CHARS, maps to a valid single-byte UTF-8 codepoint.
 </span><span class="kw">const </span>HEADER_CHARS: [u8; <span class="number">256</span>] = [
     <span class="comment">//  0      1      2      3      4      5      6      7      8      9
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//   x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  1x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  2x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;!&#39;</span>,  <span class="string">b&#39;&quot;&#39;</span>,  <span class="string">b&#39;#&#39;</span>,  <span class="string">b&#39;$&#39;</span>,  <span class="string">b&#39;%&#39;</span>,  <span class="string">b&#39;&amp;&#39;</span>, <span class="string">b&#39;\&#39;&#39;</span>, <span class="comment">//  3x
         </span><span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;*&#39;</span>,  <span class="string">b&#39;+&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;-&#39;</span>,  <span class="string">b&#39;.&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;0&#39;</span>,  <span class="string">b&#39;1&#39;</span>, <span class="comment">//  4x
      </span><span class="string">b&#39;2&#39;</span>,  <span class="string">b&#39;3&#39;</span>,  <span class="string">b&#39;4&#39;</span>,  <span class="string">b&#39;5&#39;</span>,  <span class="string">b&#39;6&#39;</span>,  <span class="string">b&#39;7&#39;</span>,  <span class="string">b&#39;8&#39;</span>,  <span class="string">b&#39;9&#39;</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  5x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;a&#39;</span>,  <span class="string">b&#39;b&#39;</span>,  <span class="string">b&#39;c&#39;</span>,  <span class="string">b&#39;d&#39;</span>,  <span class="string">b&#39;e&#39;</span>, <span class="comment">//  6x
      </span><span class="string">b&#39;f&#39;</span>,  <span class="string">b&#39;g&#39;</span>,  <span class="string">b&#39;h&#39;</span>,  <span class="string">b&#39;i&#39;</span>,  <span class="string">b&#39;j&#39;</span>,  <span class="string">b&#39;k&#39;</span>,  <span class="string">b&#39;l&#39;</span>,  <span class="string">b&#39;m&#39;</span>,  <span class="string">b&#39;n&#39;</span>,  <span class="string">b&#39;o&#39;</span>, <span class="comment">//  7x
      </span><span class="string">b&#39;p&#39;</span>,  <span class="string">b&#39;q&#39;</span>,  <span class="string">b&#39;r&#39;</span>,  <span class="string">b&#39;s&#39;</span>,  <span class="string">b&#39;t&#39;</span>,  <span class="string">b&#39;u&#39;</span>,  <span class="string">b&#39;v&#39;</span>,  <span class="string">b&#39;w&#39;</span>,  <span class="string">b&#39;x&#39;</span>,  <span class="string">b&#39;y&#39;</span>, <span class="comment">//  8x
      </span><span class="string">b&#39;z&#39;</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;^&#39;</span>,  <span class="string">b&#39;_&#39;</span>,  <span class="string">b&#39;`&#39;</span>,  <span class="string">b&#39;a&#39;</span>,  <span class="string">b&#39;b&#39;</span>,  <span class="string">b&#39;c&#39;</span>, <span class="comment">//  9x
      </span><span class="string">b&#39;d&#39;</span>,  <span class="string">b&#39;e&#39;</span>,  <span class="string">b&#39;f&#39;</span>,  <span class="string">b&#39;g&#39;</span>,  <span class="string">b&#39;h&#39;</span>,  <span class="string">b&#39;i&#39;</span>,  <span class="string">b&#39;j&#39;</span>,  <span class="string">b&#39;k&#39;</span>,  <span class="string">b&#39;l&#39;</span>,  <span class="string">b&#39;m&#39;</span>, <span class="comment">// 10x
      </span><span class="string">b&#39;n&#39;</span>,  <span class="string">b&#39;o&#39;</span>,  <span class="string">b&#39;p&#39;</span>,  <span class="string">b&#39;q&#39;</span>,  <span class="string">b&#39;r&#39;</span>,  <span class="string">b&#39;s&#39;</span>,  <span class="string">b&#39;t&#39;</span>,  <span class="string">b&#39;u&#39;</span>,  <span class="string">b&#39;v&#39;</span>,  <span class="string">b&#39;w&#39;</span>, <span class="comment">// 11x
      </span><span class="string">b&#39;x&#39;</span>,  <span class="string">b&#39;y&#39;</span>,  <span class="string">b&#39;z&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;|&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;~&#39;</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 12x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 13x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 14x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 15x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 16x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 17x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 18x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 19x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 20x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 21x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 22x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 23x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 24x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0                              </span><span class="comment">// 25x
 </span>];

 <span class="doccomment">/// Valid header name characters for HTTP/2.0 and HTTP/3.0
 </span><span class="comment">// HEADER_CHARS_H2 maps every byte that is 128 or larger to 0 so everything that is
 // mapped by HEADER_CHARS_H2, maps to a valid single-byte UTF-8 codepoint.
 </span><span class="kw">const </span>HEADER_CHARS_H2: [u8; <span class="number">256</span>] = [
     <span class="comment">//  0      1      2      3      4      5      6      7      8      9
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//   x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  1x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  2x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;!&#39;</span>,  <span class="string">b&#39;&quot;&#39;</span>,  <span class="string">b&#39;#&#39;</span>,  <span class="string">b&#39;$&#39;</span>,  <span class="string">b&#39;%&#39;</span>,  <span class="string">b&#39;&amp;&#39;</span>, <span class="string">b&#39;\&#39;&#39;</span>, <span class="comment">//  3x
         </span><span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;*&#39;</span>,  <span class="string">b&#39;+&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;-&#39;</span>,  <span class="string">b&#39;.&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;0&#39;</span>,  <span class="string">b&#39;1&#39;</span>, <span class="comment">//  4x
      </span><span class="string">b&#39;2&#39;</span>,  <span class="string">b&#39;3&#39;</span>,  <span class="string">b&#39;4&#39;</span>,  <span class="string">b&#39;5&#39;</span>,  <span class="string">b&#39;6&#39;</span>,  <span class="string">b&#39;7&#39;</span>,  <span class="string">b&#39;8&#39;</span>,  <span class="string">b&#39;9&#39;</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  5x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  6x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  7x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">//  8x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,  <span class="string">b&#39;^&#39;</span>,  <span class="string">b&#39;_&#39;</span>,  <span class="string">b&#39;`&#39;</span>,  <span class="string">b&#39;a&#39;</span>,  <span class="string">b&#39;b&#39;</span>,  <span class="string">b&#39;c&#39;</span>, <span class="comment">//  9x
      </span><span class="string">b&#39;d&#39;</span>,  <span class="string">b&#39;e&#39;</span>,  <span class="string">b&#39;f&#39;</span>,  <span class="string">b&#39;g&#39;</span>,  <span class="string">b&#39;h&#39;</span>,  <span class="string">b&#39;i&#39;</span>,  <span class="string">b&#39;j&#39;</span>,  <span class="string">b&#39;k&#39;</span>,  <span class="string">b&#39;l&#39;</span>,  <span class="string">b&#39;m&#39;</span>, <span class="comment">// 10x
      </span><span class="string">b&#39;n&#39;</span>,  <span class="string">b&#39;o&#39;</span>,  <span class="string">b&#39;p&#39;</span>,  <span class="string">b&#39;q&#39;</span>,  <span class="string">b&#39;r&#39;</span>,  <span class="string">b&#39;s&#39;</span>,  <span class="string">b&#39;t&#39;</span>,  <span class="string">b&#39;u&#39;</span>,  <span class="string">b&#39;v&#39;</span>,  <span class="string">b&#39;w&#39;</span>, <span class="comment">// 11x
      </span><span class="string">b&#39;x&#39;</span>,  <span class="string">b&#39;y&#39;</span>,  <span class="string">b&#39;z&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;|&#39;</span>,     <span class="number">0</span>,  <span class="string">b&#39;~&#39;</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 12x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 13x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 14x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 15x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 16x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 17x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 18x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 19x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 20x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 21x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 22x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 23x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>, <span class="comment">// 24x
         </span><span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0</span>,     <span class="number">0                              </span><span class="comment">// 25x
 </span>];

 <span class="kw">fn </span>parse_hdr&lt;<span class="lifetime">&#39;a</span>&gt;(
     data: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8],
     b: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>[MaybeUninit&lt;u8&gt;; SCRATCH_BUF_SIZE],
     table: <span class="kw-2">&amp;</span>[u8; <span class="number">256</span>],
 ) -&gt; <span class="prelude-ty">Result</span>&lt;HdrName&lt;<span class="lifetime">&#39;a</span>&gt;, InvalidHeaderName&gt; {
     <span class="kw">match </span>data.len() {
         <span class="number">0 </span>=&gt; <span class="prelude-val">Err</span>(InvalidHeaderName::new()),
         len @ <span class="number">1</span>..=SCRATCH_BUF_SIZE =&gt; {
             <span class="comment">// Read from data into the buffer - transforming using `table` as we go
             </span>data.iter()
                 .zip(b.iter_mut())
                 .for_each(|(index, out)| <span class="kw-2">*</span>out = MaybeUninit::new(table[<span class="kw-2">*</span>index <span class="kw">as </span>usize]));
             <span class="comment">// Safety: len bytes of b were just initialized.
             </span><span class="kw">let </span>name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8] = <span class="kw">unsafe </span>{ slice_assume_init(<span class="kw-2">&amp;</span>b[<span class="number">0</span>..len]) };
             <span class="kw">match </span>StandardHeader::from_bytes(name) {
                 <span class="prelude-val">Some</span>(sh) =&gt; <span class="prelude-val">Ok</span>(sh.into()),
                 <span class="prelude-val">None </span>=&gt; {
                     <span class="kw">if </span>name.contains(<span class="kw-2">&amp;</span><span class="number">0</span>) {
                         <span class="prelude-val">Err</span>(InvalidHeaderName::new())
                     } <span class="kw">else </span>{
                         <span class="prelude-val">Ok</span>(HdrName::custom(name, <span class="bool-val">true</span>))
                     }
                 }
             }
         }
         SCRATCH_BUF_OVERFLOW..=<span class="kw">super</span>::MAX_HEADER_NAME_LEN =&gt; <span class="prelude-val">Ok</span>(HdrName::custom(data, <span class="bool-val">false</span>)),
         <span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(InvalidHeaderName::new()),
     }
 }


 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;StandardHeader&gt; <span class="kw">for </span>HdrName&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>from(hdr: StandardHeader) -&gt; HdrName&lt;<span class="lifetime">&#39;a</span>&gt; {
         HdrName { inner: Repr::Standard(hdr) }
     }
 }

 <span class="kw">impl </span>HeaderName {
     <span class="doccomment">/// Converts a slice of bytes to an HTTP header name.
     ///
     /// This function normalizes the input.
     </span><span class="kw">pub fn </span>from_bytes(src: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;HeaderName, InvalidHeaderName&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = uninit_u8_array();
         <span class="comment">// Precondition: HEADER_CHARS is a valid table for parse_hdr().
         </span><span class="kw">match </span>parse_hdr(src, <span class="kw-2">&amp;mut </span>buf, <span class="kw-2">&amp;</span>HEADER_CHARS)<span class="question-mark">?</span>.inner {
             Repr::Standard(std) =&gt; <span class="prelude-val">Ok</span>(std.into()),
             Repr::Custom(MaybeLower { buf, lower: <span class="bool-val">true </span>}) =&gt; {
                 <span class="kw">let </span>buf = Bytes::copy_from_slice(buf);
                 <span class="comment">// Safety: the invariant on MaybeLower ensures buf is valid UTF-8.
                 </span><span class="kw">let </span>val = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(buf) };
                 <span class="prelude-val">Ok</span>(Custom(val).into())
             }
             Repr::Custom(MaybeLower { buf, lower: <span class="bool-val">false </span>}) =&gt; {
                 <span class="kw">use </span>bytes::{BufMut};
                 <span class="kw">let </span><span class="kw-2">mut </span>dst = BytesMut::with_capacity(buf.len());

                 <span class="kw">for </span>b <span class="kw">in </span>buf.iter() {
                     <span class="comment">// HEADER_CHARS maps all bytes to valid single-byte UTF-8
                     </span><span class="kw">let </span>b = HEADER_CHARS[<span class="kw-2">*</span>b <span class="kw">as </span>usize];

                     <span class="kw">if </span>b == <span class="number">0 </span>{
                         <span class="kw">return </span><span class="prelude-val">Err</span>(InvalidHeaderName::new());
                     }

                     dst.put_u8(b);
                 }

                 <span class="comment">// Safety: the loop above maps all bytes in buf to valid single byte
                 // UTF-8 before copying them into dst. This means that dst (and hence
                 // dst.freeze()) is valid UTF-8.
                 </span><span class="kw">let </span>val = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(dst.freeze()) };

                 <span class="prelude-val">Ok</span>(Custom(val).into())
             }
         }
     }

     <span class="doccomment">/// Converts a slice of bytes to an HTTP header name.
     ///
     /// This function expects the input to only contain lowercase characters.
     /// This is useful when decoding HTTP/2.0 or HTTP/3.0 headers. Both
     /// require that all headers be represented in lower case.
     ///
     /// # Examples
     ///
     /// ```
     /// # use http::header::*;
     ///
     /// // Parsing a lower case header
     /// let hdr = HeaderName::from_lowercase(b&quot;content-length&quot;).unwrap();
     /// assert_eq!(CONTENT_LENGTH, hdr);
     ///
     /// // Parsing a header that contains uppercase characters
     /// assert!(HeaderName::from_lowercase(b&quot;Content-Length&quot;).is_err());
     /// ```
     </span><span class="kw">pub fn </span>from_lowercase(src: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;HeaderName, InvalidHeaderName&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = uninit_u8_array();
         <span class="comment">// Precondition: HEADER_CHARS_H2 is a valid table for parse_hdr()
         </span><span class="kw">match </span>parse_hdr(src, <span class="kw-2">&amp;mut </span>buf, <span class="kw-2">&amp;</span>HEADER_CHARS_H2)<span class="question-mark">?</span>.inner {
             Repr::Standard(std) =&gt; <span class="prelude-val">Ok</span>(std.into()),
             Repr::Custom(MaybeLower { buf, lower: <span class="bool-val">true </span>}) =&gt; {
                 <span class="kw">let </span>buf = Bytes::copy_from_slice(buf);
                 <span class="comment">// Safety: the invariant on MaybeLower ensures buf is valid UTF-8.
                 </span><span class="kw">let </span>val = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(buf) };
                 <span class="prelude-val">Ok</span>(Custom(val).into())
             }
             Repr::Custom(MaybeLower { buf, lower: <span class="bool-val">false </span>}) =&gt; {
                 <span class="kw">for </span><span class="kw-2">&amp;</span>b <span class="kw">in </span>buf.iter() {
                     <span class="comment">// HEADER_CHARS maps all bytes that are not valid single-byte
                     // UTF-8 to 0 so this check returns an error for invalid UTF-8.
                     </span><span class="kw">if </span>b != HEADER_CHARS[b <span class="kw">as </span>usize] {
                         <span class="kw">return </span><span class="prelude-val">Err</span>(InvalidHeaderName::new());
                     }
                 }

                 <span class="kw">let </span>buf = Bytes::copy_from_slice(buf);
                 <span class="comment">// Safety: the loop above checks that each byte of buf (either
                 // version) is valid UTF-8.
                 </span><span class="kw">let </span>val = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(buf) };
                 <span class="prelude-val">Ok</span>(Custom(val).into())
             }
         }
     }

     <span class="doccomment">/// Converts a static string to a HTTP header name.
     ///
     /// This function requires the static string to only contain lowercase
     /// characters, numerals and symbols, as per the HTTP/2.0 specification
     /// and header names internal representation within this library.
     ///
     /// # Panics
     ///
     /// This function panics when the static string is a invalid header.
     ///
     /// Until [Allow panicking in constants](https://github.com/rust-lang/rfcs/pull/2345)
     /// makes its way into stable, the panic message at compile-time is
     /// going to look cryptic, but should at least point at your header value:
     ///
     /// ```text
     /// error: any use of this value will cause an error
     ///     --&gt; http/src/header/name.rs:1241:13
     ///      |
     /// 1241 |             ([] as [u8; 0])[0]; // Invalid header name
     ///      |             ^^^^^^^^^^^^^^^^^^
     ///      |             |
     ///      |             index out of bounds: the length is 0 but the index is 0
     ///      |             inside `http::HeaderName::from_static` at http/src/header/name.rs:1241:13
     ///      |             inside `INVALID_NAME` at src/main.rs:3:34
     ///      |
     ///     ::: src/main.rs:3:1
     ///      |
     /// 3    | const INVALID_NAME: HeaderName = HeaderName::from_static(&quot;Capitalized&quot;);
     ///      | ------------------------------------------------------------------------
     /// ```
     ///
     /// # Examples
     ///
     /// ```
     /// # use http::header::*;
     /// // Parsing a standard header
     /// let hdr = HeaderName::from_static(&quot;content-length&quot;);
     /// assert_eq!(CONTENT_LENGTH, hdr);
     ///
     /// // Parsing a custom header
     /// let CUSTOM_HEADER: &amp;&#39;static str = &quot;custom-header&quot;;
     ///
     /// let a = HeaderName::from_lowercase(b&quot;custom-header&quot;).unwrap();
     /// let b = HeaderName::from_static(CUSTOM_HEADER);
     /// assert_eq!(a, b);
     /// ```
     ///
     /// ```should_panic
     /// # use http::header::*;
     /// #
     /// // Parsing a header that contains invalid symbols(s):
     /// HeaderName::from_static(&quot;content{}{}length&quot;); // This line panics!
     ///
     /// // Parsing a header that contains invalid uppercase characters.
     /// let a = HeaderName::from_static(&quot;foobar&quot;);
     /// let b = HeaderName::from_static(&quot;FOOBAR&quot;); // This line panics!
     /// ```
     </span><span class="attribute">#[allow(unconditional_panic)] </span><span class="comment">// required for the panic circumvention
     </span><span class="kw">pub const fn </span>from_static(src: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str) -&gt; HeaderName {
         <span class="kw">let </span>name_bytes = src.as_bytes();
         <span class="kw">if let </span><span class="prelude-val">Some</span>(standard) = StandardHeader::from_bytes(name_bytes) {
             <span class="kw">return </span>HeaderName{
                 inner: Repr::Standard(standard),
             };
         }

         <span class="kw">if </span>name_bytes.len() == <span class="number">0 </span>|| name_bytes.len() &gt; <span class="kw">super</span>::MAX_HEADER_NAME_LEN || {
             <span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
             <span class="kw">loop </span>{
                 <span class="kw">if </span>i &gt;= name_bytes.len() {
                     <span class="kw">break </span><span class="bool-val">false</span>;
                 } <span class="kw">else if </span>HEADER_CHARS_H2[name_bytes[i] <span class="kw">as </span>usize] == <span class="number">0 </span>{
                     <span class="kw">break </span><span class="bool-val">true</span>;
                 }
                 i += <span class="number">1</span>;
             }
         } {
             ([] <span class="kw">as </span>[u8; <span class="number">0</span>])[<span class="number">0</span>]; <span class="comment">// Invalid header name
         </span>}

         HeaderName {
             inner: Repr::Custom(Custom(ByteStr::from_static(src)))
         }
     }

     <span class="doccomment">/// Returns a `str` representation of the header.
     ///
     /// The returned string will always be lower case.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="kw">match </span><span class="self">self</span>.inner {
             Repr::Standard(v) =&gt; v.as_str(),
             Repr::Custom(<span class="kw-2">ref </span>v) =&gt; <span class="kw-2">&amp;*</span>v.<span class="number">0</span>,
         }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_bytes(<span class="self">self</span>) -&gt; Bytes {
         <span class="self">self</span>.inner.into()
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>HeaderName {
     <span class="kw">type </span><span class="prelude-val">Err </span>= InvalidHeaderName;

     <span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;HeaderName, InvalidHeaderName&gt; {
         HeaderName::from_bytes(s.as_bytes()).map_err(|<span class="kw">_</span>| InvalidHeaderName { _priv: () })
     }
 }

 <span class="kw">impl </span>AsRef&lt;str&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>as_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="self">self</span>.as_str()
     }
 }

 <span class="kw">impl </span>AsRef&lt;[u8]&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>as_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="self">self</span>.as_str().as_bytes()
     }
 }

 <span class="kw">impl </span>Borrow&lt;str&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>borrow(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="self">self</span>.as_str()
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         fmt::Debug::fmt(<span class="self">self</span>.as_str(), fmt)
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         fmt::Display::fmt(<span class="self">self</span>.as_str(), fmt)
     }
 }

 <span class="kw">impl </span>InvalidHeaderName {
     <span class="kw">fn </span>new() -&gt; InvalidHeaderName {
         InvalidHeaderName { _priv: () }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>HeaderName&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>from(src: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>HeaderName) -&gt; HeaderName {
         src.clone()
     }
 }

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl</span>&lt;T&gt; From&lt;Repr&lt;T&gt;&gt; <span class="kw">for </span>Bytes
 <span class="kw">where
     </span>T: Into&lt;Bytes&gt;,
 {
     <span class="kw">fn </span>from(repr: Repr&lt;T&gt;) -&gt; Bytes {
         <span class="kw">match </span>repr {
             Repr::Standard(header) =&gt; Bytes::from_static(header.as_str().as_bytes()),
             Repr::Custom(header) =&gt; header.into(),
         }
     }
 }

 <span class="kw">impl </span>From&lt;Custom&gt; <span class="kw">for </span>Bytes {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>from(Custom(inner): Custom) -&gt; Bytes {
         Bytes::from(inner)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">type </span>Error = InvalidHeaderName;
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>try_from(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_bytes(s.as_bytes())
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>String&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">type </span>Error = InvalidHeaderName;
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>try_from(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>String) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_bytes(s.as_bytes())
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8]&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">type </span>Error = InvalidHeaderName;
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>try_from(s: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_bytes(s)
     }
 }

 <span class="kw">impl </span>TryFrom&lt;String&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">type </span>Error = InvalidHeaderName;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>try_from(s: String) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_bytes(s.as_bytes())
     }
 }

 <span class="kw">impl </span>TryFrom&lt;Vec&lt;u8&gt;&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">type </span>Error = InvalidHeaderName;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>try_from(vec: Vec&lt;u8&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
         <span class="self">Self</span>::from_bytes(<span class="kw-2">&amp;</span>vec)
     }
 }

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl </span>From&lt;StandardHeader&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>from(src: StandardHeader) -&gt; HeaderName {
         HeaderName {
             inner: Repr::Standard(src),
         }
     }
 }

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl </span>From&lt;Custom&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>from(src: Custom) -&gt; HeaderName {
         HeaderName {
             inner: Repr::Custom(src),
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>HeaderName&gt; <span class="kw">for </span>HeaderName {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;<span class="lifetime">&#39;a </span>HeaderName) -&gt; bool {
         <span class="kw-2">*</span><span class="self">self </span>== <span class="kw-2">**</span>other
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq&lt;HeaderName&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>HeaderName {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>HeaderName) -&gt; bool {
         <span class="kw-2">*</span>other == <span class="kw-2">*</span><span class="self">self
     </span>}
 }

 <span class="kw">impl </span>PartialEq&lt;str&gt; <span class="kw">for </span>HeaderName {
     <span class="doccomment">/// Performs a case-insensitive comparison of the string against the header
     /// name
     ///
     /// # Examples
     ///
     /// ```
     /// use http::header::CONTENT_LENGTH;
     ///
     /// assert_eq!(CONTENT_LENGTH, &quot;content-length&quot;);
     /// assert_eq!(CONTENT_LENGTH, &quot;Content-Length&quot;);
     /// assert_ne!(CONTENT_LENGTH, &quot;content length&quot;);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>str) -&gt; bool {
         eq_ignore_ascii_case(<span class="self">self</span>.as_ref(), other.as_bytes())
     }
 }

 <span class="kw">impl </span>PartialEq&lt;HeaderName&gt; <span class="kw">for </span>str {
     <span class="doccomment">/// Performs a case-insensitive comparison of the string against the header
     /// name
     ///
     /// # Examples
     ///
     /// ```
     /// use http::header::CONTENT_LENGTH;
     ///
     /// assert_eq!(CONTENT_LENGTH, &quot;content-length&quot;);
     /// assert_eq!(CONTENT_LENGTH, &quot;Content-Length&quot;);
     /// assert_ne!(CONTENT_LENGTH, &quot;content length&quot;);
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>HeaderName) -&gt; bool {
         <span class="kw-2">*</span>other == <span class="kw-2">*</span><span class="self">self
     </span>}
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str&gt; <span class="kw">for </span>HeaderName {
     <span class="doccomment">/// Performs a case-insensitive comparison of the string against the header
     /// name
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;<span class="lifetime">&#39;a </span>str) -&gt; bool {
         <span class="kw-2">*</span><span class="self">self </span>== <span class="kw-2">**</span>other
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq&lt;HeaderName&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>str {
     <span class="doccomment">/// Performs a case-insensitive comparison of the string against the header
     /// name
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>HeaderName) -&gt; bool {
         <span class="kw-2">*</span>other == <span class="kw-2">*</span><span class="self">self
     </span>}
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>InvalidHeaderName {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         f.debug_struct(<span class="string">&quot;InvalidHeaderName&quot;</span>)
             <span class="comment">// skip _priv noise
             </span>.finish()
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>InvalidHeaderName {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.write_str(<span class="string">&quot;invalid HTTP header name&quot;</span>)
     }
 }

 <span class="kw">impl </span>Error <span class="kw">for </span>InvalidHeaderName {}

 <span class="comment">// ===== HdrName =====

 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; HdrName&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="comment">// Precondition: if lower then buf is valid UTF-8
     </span><span class="kw">fn </span>custom(buf: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8], lower: bool) -&gt; HdrName&lt;<span class="lifetime">&#39;a</span>&gt; {
         HdrName {
             <span class="comment">// Invariant (on MaybeLower): follows from the precondition
             </span>inner: Repr::Custom(MaybeLower {
                 buf: buf,
                 lower: lower,
             }),
         }
     }

     <span class="kw">pub fn </span>from_bytes&lt;F, U&gt;(hdr: <span class="kw-2">&amp;</span>[u8], f: F) -&gt; <span class="prelude-ty">Result</span>&lt;U, InvalidHeaderName&gt;
         <span class="kw">where </span>F: FnOnce(HdrName&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; U,
     {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = uninit_u8_array();
         <span class="comment">// Precondition: HEADER_CHARS is a valid table for parse_hdr().
         </span><span class="kw">let </span>hdr = parse_hdr(hdr, <span class="kw-2">&amp;mut </span>buf, <span class="kw-2">&amp;</span>HEADER_CHARS)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(f(hdr))
     }

     <span class="kw">pub fn </span>from_static&lt;F, U&gt;(hdr: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str, f: F) -&gt; U
     <span class="kw">where
         </span>F: FnOnce(HdrName&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; U,
     {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = uninit_u8_array();
         <span class="kw">let </span>hdr =
             <span class="comment">// Precondition: HEADER_CHARS is a valid table for parse_hdr().
             </span>parse_hdr(hdr.as_bytes(), <span class="kw-2">&amp;mut </span>buf, <span class="kw-2">&amp;</span>HEADER_CHARS).expect(<span class="string">&quot;static str is invalid name&quot;</span>);
         f(hdr)
     }
 }

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; From&lt;HdrName&lt;<span class="lifetime">&#39;a</span>&gt;&gt; <span class="kw">for </span>HeaderName {
     <span class="kw">fn </span>from(src: HdrName&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; HeaderName {
         <span class="kw">match </span>src.inner {
             Repr::Standard(s) =&gt; HeaderName {
                 inner: Repr::Standard(s),
             },
             Repr::Custom(maybe_lower) =&gt; {
                 <span class="kw">if </span>maybe_lower.lower {
                     <span class="kw">let </span>buf = Bytes::copy_from_slice(<span class="kw-2">&amp;</span>maybe_lower.buf[..]);
                     <span class="comment">// Safety: the invariant on MaybeLower ensures buf is valid UTF-8.
                     </span><span class="kw">let </span>byte_str = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(buf) };

                     HeaderName {
                         inner: Repr::Custom(Custom(byte_str)),
                     }
                 } <span class="kw">else </span>{
                     <span class="kw">use </span>bytes::BufMut;
                     <span class="kw">let </span><span class="kw-2">mut </span>dst = BytesMut::with_capacity(maybe_lower.buf.len());

                     <span class="kw">for </span>b <span class="kw">in </span>maybe_lower.buf.iter() {
                         <span class="comment">// HEADER_CHARS maps each byte to a valid single-byte UTF-8
                         // codepoint.
                         </span>dst.put_u8(HEADER_CHARS[<span class="kw-2">*</span>b <span class="kw">as </span>usize]);
                     }

                     <span class="comment">// Safety: the loop above maps each byte of maybe_lower.buf to a
                     // valid single-byte UTF-8 codepoint before copying it into dst.
                     // dst (and hence dst.freeze()) is thus valid UTF-8.
                     </span><span class="kw">let </span>buf = <span class="kw">unsafe </span>{ ByteStr::from_utf8_unchecked(dst.freeze()) };

                     HeaderName {
                         inner: Repr::Custom(Custom(buf)),
                     }
                 }
             }
         }
     }
 }

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; PartialEq&lt;HdrName&lt;<span class="lifetime">&#39;a</span>&gt;&gt; <span class="kw">for </span>HeaderName {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>HdrName&lt;<span class="lifetime">&#39;a</span>&gt;) -&gt; bool {
         <span class="kw">match </span><span class="self">self</span>.inner {
             Repr::Standard(a) =&gt; <span class="kw">match </span>other.inner {
                 Repr::Standard(b) =&gt; a == b,
                 <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
             },
             Repr::Custom(Custom(<span class="kw-2">ref </span>a)) =&gt; <span class="kw">match </span>other.inner {
                 Repr::Custom(<span class="kw-2">ref </span>b) =&gt; {
                     <span class="kw">if </span>b.lower {
                         a.as_bytes() == b.buf
                     } <span class="kw">else </span>{
                         eq_ignore_ascii_case(a.as_bytes(), b.buf)
                     }
                 }
                 <span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
             },
         }
     }
 }

 <span class="comment">// ===== Custom =====

 </span><span class="kw">impl </span>Hash <span class="kw">for </span>Custom {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, hasher: <span class="kw-2">&amp;mut </span>H) {
         hasher.write(<span class="self">self</span>.<span class="number">0</span>.as_bytes())
     }
 }

 <span class="comment">// ===== MaybeLower =====

 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Hash <span class="kw">for </span>MaybeLower&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>hash&lt;H: Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, hasher: <span class="kw-2">&amp;mut </span>H) {
         <span class="kw">if </span><span class="self">self</span>.lower {
             hasher.write(<span class="self">self</span>.buf);
         } <span class="kw">else </span>{
             <span class="kw">for </span><span class="kw-2">&amp;</span>b <span class="kw">in </span><span class="self">self</span>.buf {
                 hasher.write(<span class="kw-2">&amp;</span>[HEADER_CHARS[b <span class="kw">as </span>usize]]);
             }
         }
     }
 }

 <span class="comment">// Assumes that the left hand side is already lower case
 </span><span class="attribute">#[inline]
 </span><span class="kw">fn </span>eq_ignore_ascii_case(lower: <span class="kw-2">&amp;</span>[u8], s: <span class="kw-2">&amp;</span>[u8]) -&gt; bool {
     <span class="kw">if </span>lower.len() != s.len() {
         <span class="kw">return </span><span class="bool-val">false</span>;
     }

     lower.iter().zip(s).all(|(a, b)| {
         <span class="kw-2">*</span>a == HEADER_CHARS[<span class="kw-2">*</span>b <span class="kw">as </span>usize]
     })
 }

 <span class="comment">// Utility functions for MaybeUninit&lt;&gt;. These are drawn from unstable API&#39;s on
 // MaybeUninit&lt;&gt; itself.
 </span><span class="kw">const </span>SCRATCH_BUF_SIZE: usize = <span class="number">64</span>;
 <span class="kw">const </span>SCRATCH_BUF_OVERFLOW: usize = SCRATCH_BUF_SIZE + <span class="number">1</span>;

 <span class="kw">fn </span>uninit_u8_array() -&gt; [MaybeUninit&lt;u8&gt;; SCRATCH_BUF_SIZE] {
     <span class="kw">let </span>arr = MaybeUninit::&lt;[MaybeUninit&lt;u8&gt;; SCRATCH_BUF_SIZE]&gt;::uninit();
     <span class="comment">// Safety: assume_init() is claiming that an array of MaybeUninit&lt;&gt;
     // has been initilized, but MaybeUninit&lt;&gt;&#39;s do not require initilizaton.
     </span><span class="kw">unsafe </span>{ arr.assume_init() }
 }

 <span class="comment">// Assuming all the elements are initilized, get a slice of them.
 //
 // Safety: All elements of `slice` must be initilized to prevent
 // undefined behavior.
 </span><span class="kw">unsafe fn </span>slice_assume_init&lt;T&gt;(slice: <span class="kw-2">&amp;</span>[MaybeUninit&lt;T&gt;]) -&gt; <span class="kw-2">&amp;</span>[T] {
     <span class="kw-2">&amp;*</span>(slice <span class="kw">as </span><span class="kw-2">*const </span>[MaybeUninit&lt;T&gt;] <span class="kw">as </span><span class="kw-2">*const </span>[T])
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use super</span>::<span class="kw-2">*</span>;
     <span class="kw">use </span><span class="self">self</span>::StandardHeader::Vary;

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_bounds() {
         <span class="kw">fn </span>check_bounds&lt;T: Sync + Send&gt;() {}
         check_bounds::&lt;HeaderName&gt;();
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_parse_invalid_headers() {
         <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">128 </span>{
             <span class="kw">let </span>hdr = <span class="macro">vec!</span>[<span class="number">1u8</span>; i];
             <span class="macro">assert!</span>(HeaderName::from_bytes(<span class="kw-2">&amp;</span>hdr).is_err(), <span class="string">&quot;{} invalid header chars did not fail&quot;</span>, i);
         }
     }

     <span class="kw">const </span>ONE_TOO_LONG: <span class="kw-2">&amp;</span>[u8] = <span class="kw-2">&amp;</span>[<span class="string">b&#39;a&#39;</span>; <span class="kw">super</span>::<span class="kw">super</span>::MAX_HEADER_NAME_LEN+<span class="number">1</span>];

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_invalid_name_lengths() {
         <span class="macro">assert!</span>(
             HeaderName::from_bytes(<span class="kw-2">&amp;</span>[]).is_err(),
             <span class="string">&quot;zero-length header name is an error&quot;</span>,
         );

         <span class="kw">let </span>long = <span class="kw-2">&amp;</span>ONE_TOO_LONG[<span class="number">0</span>..<span class="kw">super</span>::<span class="kw">super</span>::MAX_HEADER_NAME_LEN];

         <span class="kw">let </span>long_str = std::str::from_utf8(long).unwrap();
         <span class="macro">assert_eq!</span>(HeaderName::from_static(long_str), long_str); <span class="comment">// shouldn&#39;t panic!

         </span><span class="macro">assert!</span>(
             HeaderName::from_bytes(long).is_ok(),
             <span class="string">&quot;max header name length is ok&quot;</span>,
         );
         <span class="macro">assert!</span>(
             HeaderName::from_bytes(ONE_TOO_LONG).is_err(),
             <span class="string">&quot;longer than max header name length is an error&quot;</span>,
         );
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_static_invalid_name_lengths() {
         <span class="comment">// Safety: ONE_TOO_LONG contains only the UTF-8 safe, single-byte codepoint b&#39;a&#39;.
         </span><span class="kw">let _ </span>= HeaderName::from_static(<span class="kw">unsafe </span>{ std::str::from_utf8_unchecked(ONE_TOO_LONG) });
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_hdr_name() {
         <span class="kw">use </span><span class="self">self</span>::StandardHeader::Vary;

         <span class="kw">let </span>name = HeaderName::from(HdrName {
             inner: Repr::Standard(Vary),
         });

         <span class="macro">assert_eq!</span>(name.inner, Repr::Standard(Vary));

         <span class="kw">let </span>name = HeaderName::from(HdrName {
             inner: Repr::Custom(MaybeLower {
                 buf: <span class="string">b&quot;hello-world&quot;</span>,
                 lower: <span class="bool-val">true</span>,
             }),
         });

         <span class="macro">assert_eq!</span>(name.inner, Repr::Custom(Custom(ByteStr::from_static(<span class="string">&quot;hello-world&quot;</span>))));

         <span class="kw">let </span>name = HeaderName::from(HdrName {
             inner: Repr::Custom(MaybeLower {
                 buf: <span class="string">b&quot;Hello-World&quot;</span>,
                 lower: <span class="bool-val">false</span>,
             }),
         });

         <span class="macro">assert_eq!</span>(name.inner, Repr::Custom(Custom(ByteStr::from_static(<span class="string">&quot;hello-world&quot;</span>))));
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_eq_hdr_name() {
         <span class="kw">use </span><span class="self">self</span>::StandardHeader::Vary;

         <span class="kw">let </span>a = HeaderName { inner: Repr::Standard(Vary) };
         <span class="kw">let </span>b = HdrName { inner: Repr::Standard(Vary) };

         <span class="macro">assert_eq!</span>(a, b);

         <span class="kw">let </span>a = HeaderName { inner: Repr::Custom(Custom(ByteStr::from_static(<span class="string">&quot;vaary&quot;</span>))) };
         <span class="macro">assert_ne!</span>(a, b);

         <span class="kw">let </span>b = HdrName { inner: Repr::Custom(MaybeLower {
             buf: <span class="string">b&quot;vaary&quot;</span>,
             lower: <span class="bool-val">true</span>,
         })};

         <span class="macro">assert_eq!</span>(a, b);

         <span class="kw">let </span>b = HdrName { inner: Repr::Custom(MaybeLower {
             buf: <span class="string">b&quot;vaary&quot;</span>,
             lower: <span class="bool-val">false</span>,
         })};

         <span class="macro">assert_eq!</span>(a, b);

         <span class="kw">let </span>b = HdrName { inner: Repr::Custom(MaybeLower {
             buf: <span class="string">b&quot;VAARY&quot;</span>,
             lower: <span class="bool-val">false</span>,
         })};

         <span class="macro">assert_eq!</span>(a, b);

         <span class="kw">let </span>a = HeaderName { inner: Repr::Standard(Vary) };
         <span class="macro">assert_ne!</span>(a, b);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_static_std() {
         <span class="kw">let </span>a = HeaderName { inner: Repr::Standard(Vary) };

         <span class="kw">let </span>b = HeaderName::from_static(<span class="string">&quot;vary&quot;</span>);
         <span class="macro">assert_eq!</span>(a, b);

         <span class="kw">let </span>b = HeaderName::from_static(<span class="string">&quot;vaary&quot;</span>);
         <span class="macro">assert_ne!</span>(a, b);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_std_uppercase() {
         HeaderName::from_static(<span class="string">&quot;Vary&quot;</span>);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_std_symbol() {
         HeaderName::from_static(<span class="string">&quot;vary{}&quot;</span>);
     }

     <span class="comment">// MaybeLower { lower: true }
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_static_custom_short() {
         <span class="kw">let </span>a = HeaderName { inner: Repr::Custom(Custom(ByteStr::from_static(<span class="string">&quot;customheader&quot;</span>))) };
         <span class="kw">let </span>b = HeaderName::from_static(<span class="string">&quot;customheader&quot;</span>);
         <span class="macro">assert_eq!</span>(a, b);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_custom_short_uppercase() {
         HeaderName::from_static(<span class="string">&quot;custom header&quot;</span>);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_custom_short_symbol() {
         HeaderName::from_static(<span class="string">&quot;CustomHeader&quot;</span>);
     }

     <span class="comment">// MaybeLower { lower: false }
     </span><span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_static_custom_long() {
         <span class="kw">let </span>a = HeaderName { inner: Repr::Custom(Custom(ByteStr::from_static(
             <span class="string">&quot;longer-than-63--thisheaderislongerthansixtythreecharactersandthushandleddifferent&quot;
         </span>))) };
         <span class="kw">let </span>b = HeaderName::from_static(
             <span class="string">&quot;longer-than-63--thisheaderislongerthansixtythreecharactersandthushandleddifferent&quot;
         </span>);
         <span class="macro">assert_eq!</span>(a, b);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_custom_long_uppercase() {
         HeaderName::from_static(
             <span class="string">&quot;Longer-Than-63--ThisHeaderIsLongerThanSixtyThreeCharactersAndThusHandledDifferent&quot;
         </span>);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_custom_long_symbol() {
         HeaderName::from_static(
             <span class="string">&quot;longer-than-63--thisheader{}{}{}{}islongerthansixtythreecharactersandthushandleddifferent&quot;
         </span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_from_static_custom_single_char() {
         <span class="kw">let </span>a = HeaderName { inner: Repr::Custom(Custom(ByteStr::from_static(<span class="string">&quot;a&quot;</span>))) };
         <span class="kw">let </span>b = HeaderName::from_static(<span class="string">&quot;a&quot;</span>);
         <span class="macro">assert_eq!</span>(a, b);
     }

     <span class="attribute">#[test]
     #[should_panic]
     </span><span class="kw">fn </span>test_from_static_empty() {
         HeaderName::from_static(<span class="string">&quot;&quot;</span>);
     }

     <span class="attribute">#[test]
     </span><span class="kw">fn </span>test_all_tokens() {
         HeaderName::from_static(<span class="string">&quot;!#$%&amp;&#39;*+-.^_`|~0123456789abcdefghijklmnopqrstuvwxyz&quot;</span>);
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="http" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>