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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/hyper-0.14.26/src/client/conn.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>conn.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="../../../hyper/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="../../../hyper/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="doccomment">//! Lower-level client connection API.
 //!
 //! The types in this module are to provide a lower-level API based around a
 //! single connection. Connecting to a host, pooling connections, and the like
 //! are not handled at this level. This module provides the building blocks to
 //! customize those things externally.
 //!
 //! If don&#39;t have need to manage connections yourself, consider using the
 //! higher-level [Client](super) API.
 //!
 //! ## Example
 //! A simple example that uses the `SendRequest` struct to talk HTTP over a Tokio TCP stream
 //! ```no_run
 //! # #[cfg(all(feature = &quot;client&quot;, feature = &quot;http1&quot;, feature = &quot;runtime&quot;))]
 //! # mod rt {
 //! use tower::ServiceExt;
 //! use http::{Request, StatusCode};
 //! use hyper::{client::conn, Body};
 //! use tokio::net::TcpStream;
 //!
 //! #[tokio::main]
 //! async fn main() -&gt; Result&lt;(), Box&lt;dyn std::error::Error&gt;&gt; {
 //!     let target_stream = TcpStream::connect(&quot;example.com:80&quot;).await?;
 //!
 //!     let (mut request_sender, connection) = conn::handshake(target_stream).await?;
 //!
 //!     // spawn a task to poll the connection and drive the HTTP state
 //!     tokio::spawn(async move {
 //!         if let Err(e) = connection.await {
 //!             eprintln!(&quot;Error in connection: {}&quot;, e);
 //!         }
 //!     });
 //!
 //!     let request = Request::builder()
 //!         // We need to manually add the host header because SendRequest does not
 //!         .header(&quot;Host&quot;, &quot;example.com&quot;)
 //!         .method(&quot;GET&quot;)
 //!         .body(Body::from(&quot;&quot;))?;
 //!     let response = request_sender.send_request(request).await?;
 //!     assert!(response.status() == StatusCode::OK);
 //!
 //!     // To send via the same connection again, it may not work as it may not be ready,
 //!     // so we have to wait until the request_sender becomes ready.
 //!     request_sender.ready().await?;
 //!     let request = Request::builder()
 //!         .header(&quot;Host&quot;, &quot;example.com&quot;)
 //!         .method(&quot;GET&quot;)
 //!         .body(Body::from(&quot;&quot;))?;
 //!     let response = request_sender.send_request(request).await?;
 //!     assert!(response.status() == StatusCode::OK);
 //!     Ok(())
 //! }
 //!
 //! # }
 //! ```

 </span><span class="attribute">#[cfg(all(feature = <span class="string">&quot;backports&quot;</span>, feature = <span class="string">&quot;http1&quot;</span>))]
 </span><span class="kw">pub mod </span>http1;
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;backports&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>))]
 </span><span class="kw">pub mod </span>http2;

 <span class="kw">use </span>std::error::Error <span class="kw">as </span>StdError;
 <span class="kw">use </span>std::fmt;
 <span class="attribute">#[cfg(not(all(feature = <span class="string">&quot;http1&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>)))]
 </span><span class="kw">use </span>std::marker::PhantomData;
 <span class="kw">use </span>std::sync::Arc;
 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;runtime&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>))]
 </span><span class="kw">use </span>std::time::Duration;

 <span class="kw">use </span>bytes::Bytes;
 <span class="kw">use </span>futures_util::future::{<span class="self">self</span>, Either, FutureExt <span class="kw">as _</span>};
 <span class="kw">use </span>httparse::ParserConfig;
 <span class="kw">use </span>pin_project_lite::pin_project;
 <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite};
 <span class="kw">use </span>tower_service::Service;
 <span class="kw">use </span>tracing::{debug, trace};

 <span class="kw">use </span><span class="kw">super</span>::dispatch;
 <span class="kw">use </span><span class="kw">crate</span>::body::HttpBody;
 <span class="attribute">#[cfg(not(all(feature = <span class="string">&quot;http1&quot;</span>, feature = <span class="string">&quot;http2&quot;</span>)))]
 </span><span class="kw">use </span><span class="kw">crate</span>::common::Never;
 <span class="kw">use </span><span class="kw">crate</span>::common::{
     exec::{BoxSendFuture, Exec},
     task, Future, Pin, Poll,
 };
 <span class="kw">use </span><span class="kw">crate</span>::proto;
 <span class="kw">use </span><span class="kw">crate</span>::rt::Executor;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
 </span><span class="kw">use </span><span class="kw">crate</span>::upgrade::Upgraded;
 <span class="kw">use crate</span>::{Body, Request, Response};

 <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
 </span><span class="kw">type </span>Http1Dispatcher&lt;T, B&gt; =
     proto::dispatch::Dispatcher&lt;proto::dispatch::Client&lt;B&gt;, B, T, proto::h1::ClientTransaction&gt;;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http1&quot;</span>))]
 </span><span class="kw">type </span>Http1Dispatcher&lt;T, B&gt; = (Never, PhantomData&lt;(T, Pin&lt;Box&lt;B&gt;&gt;)&gt;);

 <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">type </span>Http2ClientTask&lt;B&gt; = proto::h2::ClientTask&lt;B&gt;;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http2&quot;</span>))]
 </span><span class="kw">type </span>Http2ClientTask&lt;B&gt; = (Never, PhantomData&lt;Pin&lt;Box&lt;B&gt;&gt;&gt;);

 <span class="macro">pin_project! </span>{
     <span class="attribute">#[project = ProtoClientProj]
     </span><span class="kw">enum </span>ProtoClient&lt;T, B&gt;
     <span class="kw">where
         </span>B: HttpBody,
     {
         H1 {
             <span class="attribute">#[pin]
             </span>h1: Http1Dispatcher&lt;T, B&gt;,
         },
         H2 {
             <span class="attribute">#[pin]
             </span>h2: Http2ClientTask&lt;B&gt;,
         },
     }
 }

 <span class="doccomment">/// Returns a handshake future over some IO.
 ///
 /// This is a shortcut for `Builder::new().handshake(io)`.
 /// See [`client::conn`](crate::client::conn) for more.
 </span><span class="attribute">#[cfg_attr(
     feature = <span class="string">&quot;deprecated&quot;</span>,
     deprecated(
         note = <span class="string">&quot;This function will be replaced with `client::conn::http1::handshake` and `client::conn::http2::handshake` in 1.0, enable the \&quot;backports\&quot; feature to use them now.&quot;
     </span>)
 )]
 #[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">pub async fn </span>handshake&lt;T&gt;(
     io: T,
 ) -&gt; <span class="kw">crate</span>::Result&lt;(SendRequest&lt;<span class="kw">crate</span>::Body&gt;, Connection&lt;T, <span class="kw">crate</span>::Body&gt;)&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin + Send + <span class="lifetime">&#39;static</span>,
 {
     <span class="attribute">#[allow(deprecated)]
     </span>Builder::new().handshake(io).<span class="kw">await
 </span>}

 <span class="doccomment">/// The sender side of an established connection.
 </span><span class="attribute">#[cfg_attr(
     feature = <span class="string">&quot;deprecated&quot;</span>,
     deprecated(
         note = <span class="string">&quot;This type will be replaced with `client::conn::http1::SendRequest` and `client::conn::http2::SendRequest` in 1.0, enable the \&quot;backports\&quot; feature to use them now.&quot;
     </span>)
 )]
 </span><span class="kw">pub struct </span>SendRequest&lt;B&gt; {
     dispatch: dispatch::Sender&lt;Request&lt;B&gt;, Response&lt;Body&gt;&gt;,
 }

 <span class="doccomment">/// A future that processes all HTTP state for the IO object.
 ///
 /// In most cases, this should just be spawned into an executor, so that it
 /// can process incoming and outgoing messages, notice hangups, and the like.
 </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 #[cfg_attr(
     feature = <span class="string">&quot;deprecated&quot;</span>,
     deprecated(
         note = <span class="string">&quot;This type will be replaced with `client::conn::http1::Connection` and `client::conn::http2::Connection` in 1.0, enable the \&quot;backports\&quot; feature to use them now.&quot;
     </span>)
 )]
 </span><span class="kw">pub struct </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Send + <span class="lifetime">&#39;static</span>,
     B: HttpBody + <span class="lifetime">&#39;static</span>,
 {
     inner: <span class="prelude-ty">Option</span>&lt;ProtoClient&lt;T, B&gt;&gt;,
 }

 <span class="doccomment">/// A builder to configure an HTTP connection.
 ///
 /// After setting options, the builder is used to create a handshake future.
 </span><span class="attribute">#[derive(Clone, Debug)]
 #[cfg_attr(
     feature = <span class="string">&quot;deprecated&quot;</span>,
     deprecated(
         note = <span class="string">&quot;This type will be replaced with `client::conn::http1::Builder` and `client::conn::http2::Builder` in 1.0, enable the \&quot;backports\&quot; feature to use them now.&quot;
     </span>)
 )]
 </span><span class="kw">pub struct </span>Builder {
     <span class="kw">pub</span>(<span class="kw">super</span>) exec: Exec,
     h09_responses: bool,
     h1_parser_config: ParserConfig,
     h1_writev: <span class="prelude-ty">Option</span>&lt;bool&gt;,
     h1_title_case_headers: bool,
     h1_preserve_header_case: bool,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
     </span>h1_preserve_header_order: bool,
     h1_read_buf_exact_size: <span class="prelude-ty">Option</span>&lt;usize&gt;,
     h1_max_buf_size: <span class="prelude-ty">Option</span>&lt;usize&gt;,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
     </span>h1_headers_raw: bool,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     </span>h2_builder: proto::h2::client::Config,
     version: Proto,
 }

 <span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">enum </span>Proto {
     <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
     </span>Http1,
     <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     </span>Http2,
 }

 <span class="doccomment">/// A future returned by `SendRequest::send_request`.
 ///
 /// Yields a `Response` if successful.
 </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>ResponseFuture {
     inner: ResponseFutureState,
 }

 <span class="kw">enum </span>ResponseFutureState {
     Waiting(dispatch::Promise&lt;Response&lt;Body&gt;&gt;),
     <span class="comment">// Option is to be able to `take()` it in `poll`
     </span>Error(<span class="prelude-ty">Option</span>&lt;<span class="kw">crate</span>::Error&gt;),
 }

 <span class="doccomment">/// Deconstructed parts of a `Connection`.
 ///
 /// This allows taking apart a `Connection` at a later time, in order to
 /// reclaim the IO object, and additional related pieces.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Parts&lt;T&gt; {
     <span class="doccomment">/// The original IO object used in the handshake.
     </span><span class="kw">pub </span>io: T,
     <span class="doccomment">/// A buffer of bytes that have been read but not processed as HTTP.
     ///
     /// For instance, if the `Connection` is used for an HTTP upgrade request,
     /// it is possible the server sent back the first bytes of the new protocol
     /// along with the response upgrade.
     ///
     /// You will want to check for any existing bytes if you plan to continue
     /// communicating on the IO object.
     </span><span class="kw">pub </span>read_buf: Bytes,
     _inner: (),
 }

 <span class="comment">// ========== internal client api

 // A `SendRequest` that can be cloned to send HTTP2 requests.
 // private for now, probably not a great idea of a type...
 </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 #[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Http2SendRequest&lt;B&gt; {
     dispatch: dispatch::UnboundedSender&lt;Request&lt;B&gt;, Response&lt;Body&gt;&gt;,
 }

 <span class="comment">// ===== impl SendRequest

 </span><span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;B&gt; SendRequest&lt;B&gt; {
     <span class="doccomment">/// Polls to determine whether this sender can be used yet for a request.
     ///
     /// If the associated connection is closed, this returns an Error.
     </span><span class="kw">pub fn </span>poll_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="kw">crate</span>::Result&lt;()&gt;&gt; {
         <span class="self">self</span>.dispatch.poll_ready(cx)
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">async fn </span>when_ready(<span class="self">self</span>) -&gt; <span class="kw">crate</span>::Result&lt;<span class="self">Self</span>&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>me = <span class="prelude-val">Some</span>(<span class="self">self</span>);
         future::poll_fn(<span class="kw">move </span>|cx| {
             <span class="macro">ready!</span>(me.as_mut().unwrap().poll_ready(cx))<span class="question-mark">?</span>;
             Poll::Ready(<span class="prelude-val">Ok</span>(me.take().unwrap()))
         })
         .<span class="kw">await
     </span>}

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_ready(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.dispatch.is_ready()
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_closed(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.dispatch.is_closed()
     }

     <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>into_http2(<span class="self">self</span>) -&gt; Http2SendRequest&lt;B&gt; {
         Http2SendRequest {
             dispatch: <span class="self">self</span>.dispatch.unbound(),
         }
     }
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;B&gt; SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: HttpBody + <span class="lifetime">&#39;static</span>,
 {
     <span class="doccomment">/// Sends a `Request` on the associated connection.
     ///
     /// Returns a future that if successful, yields the `Response`.
     ///
     /// # Note
     ///
     /// There are some key differences in what automatic things the `Client`
     /// does for you that will not be done here:
     ///
     /// - `Client` requires absolute-form `Uri`s, since the scheme and
     ///   authority are needed to connect. They aren&#39;t required here.
     /// - Since the `Client` requires absolute-form `Uri`s, it can add
     ///   the `Host` header based on it. You must add a `Host` header yourself
     ///   before calling this method.
     /// - Since absolute-form `Uri`s are not required, if received, they will
     ///   be serialized as-is.
     ///
     /// # Example
     ///
     /// ```
     /// # use http::header::HOST;
     /// # use hyper::client::conn::SendRequest;
     /// # use hyper::Body;
     /// use hyper::Request;
     ///
     /// # async fn doc(mut tx: SendRequest&lt;Body&gt;) -&gt; hyper::Result&lt;()&gt; {
     /// // build a Request
     /// let req = Request::builder()
     ///     .uri(&quot;/foo/bar&quot;)
     ///     .header(HOST, &quot;hyper.rs&quot;)
     ///     .body(Body::empty())
     ///     .unwrap();
     ///
     /// // send it and await a Response
     /// let res = tx.send_request(req).await?;
     /// // assert the Response
     /// assert!(res.status().is_success());
     /// # Ok(())
     /// # }
     /// # fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>send_request(<span class="kw-2">&amp;mut </span><span class="self">self</span>, req: Request&lt;B&gt;) -&gt; ResponseFuture {
         <span class="kw">let </span>inner = <span class="kw">match </span><span class="self">self</span>.dispatch.send(req) {
             <span class="prelude-val">Ok</span>(rx) =&gt; ResponseFutureState::Waiting(rx),
             <span class="prelude-val">Err</span>(_req) =&gt; {
                 <span class="macro">debug!</span>(<span class="string">&quot;connection was not ready&quot;</span>);
                 <span class="kw">let </span>err = <span class="kw">crate</span>::Error::new_canceled().with(<span class="string">&quot;connection was not ready&quot;</span>);
                 ResponseFutureState::Error(<span class="prelude-val">Some</span>(err))
             }
         };

         ResponseFuture { inner }
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>send_request_retryable(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         req: Request&lt;B&gt;,
     ) -&gt; <span class="kw">impl </span>Future&lt;Output = <span class="prelude-ty">Result</span>&lt;Response&lt;Body&gt;, (<span class="kw">crate</span>::Error, <span class="prelude-ty">Option</span>&lt;Request&lt;B&gt;&gt;)&gt;&gt; + Unpin
     <span class="kw">where
         </span>B: Send,
     {
         <span class="kw">match </span><span class="self">self</span>.dispatch.try_send(req) {
             <span class="prelude-val">Ok</span>(rx) =&gt; {
                 Either::Left(rx.then(<span class="kw">move </span>|res| {
                     <span class="kw">match </span>res {
                         <span class="prelude-val">Ok</span>(<span class="prelude-val">Ok</span>(res)) =&gt; future::ok(res),
                         <span class="prelude-val">Ok</span>(<span class="prelude-val">Err</span>(err)) =&gt; future::err(err),
                         <span class="comment">// this is definite bug if it happens, but it shouldn&#39;t happen!
                         </span><span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(<span class="string">&quot;dispatch dropped without returning error&quot;</span>),
                     }
                 }))
             }
             <span class="prelude-val">Err</span>(req) =&gt; {
                 <span class="macro">debug!</span>(<span class="string">&quot;connection was not ready&quot;</span>);
                 <span class="kw">let </span>err = <span class="kw">crate</span>::Error::new_canceled().with(<span class="string">&quot;connection was not ready&quot;</span>);
                 Either::Right(future::err((err, <span class="prelude-val">Some</span>(req))))
             }
         }
     }
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;B&gt; Service&lt;Request&lt;B&gt;&gt; <span class="kw">for </span>SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: HttpBody + <span class="lifetime">&#39;static</span>,
 {
     <span class="kw">type </span>Response = Response&lt;Body&gt;;
     <span class="kw">type </span>Error = <span class="kw">crate</span>::Error;
     <span class="kw">type </span>Future = ResponseFuture;

     <span class="kw">fn </span>poll_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;(), <span class="self">Self</span>::Error&gt;&gt; {
         <span class="self">self</span>.poll_ready(cx)
     }

     <span class="kw">fn </span>call(<span class="kw-2">&amp;mut </span><span class="self">self</span>, req: Request&lt;B&gt;) -&gt; <span class="self">Self</span>::Future {
         <span class="self">self</span>.send_request(req)
     }
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;B&gt; fmt::Debug <span class="kw">for </span>SendRequest&lt;B&gt; {
     <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.debug_struct(<span class="string">&quot;SendRequest&quot;</span>).finish()
     }
 }

 <span class="comment">// ===== impl Http2SendRequest

 </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">impl</span>&lt;B&gt; Http2SendRequest&lt;B&gt; {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_ready(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.dispatch.is_ready()
     }

     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>is_closed(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.dispatch.is_closed()
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">impl</span>&lt;B&gt; Http2SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: HttpBody + <span class="lifetime">&#39;static</span>,
 {
     <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>send_request_retryable(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         req: Request&lt;B&gt;,
     ) -&gt; <span class="kw">impl </span>Future&lt;Output = <span class="prelude-ty">Result</span>&lt;Response&lt;Body&gt;, (<span class="kw">crate</span>::Error, <span class="prelude-ty">Option</span>&lt;Request&lt;B&gt;&gt;)&gt;&gt;
     <span class="kw">where
         </span>B: Send,
     {
         <span class="kw">match </span><span class="self">self</span>.dispatch.try_send(req) {
             <span class="prelude-val">Ok</span>(rx) =&gt; {
                 Either::Left(rx.then(<span class="kw">move </span>|res| {
                     <span class="kw">match </span>res {
                         <span class="prelude-val">Ok</span>(<span class="prelude-val">Ok</span>(res)) =&gt; future::ok(res),
                         <span class="prelude-val">Ok</span>(<span class="prelude-val">Err</span>(err)) =&gt; future::err(err),
                         <span class="comment">// this is definite bug if it happens, but it shouldn&#39;t happen!
                         </span><span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="macro">panic!</span>(<span class="string">&quot;dispatch dropped without returning error&quot;</span>),
                     }
                 }))
             }
             <span class="prelude-val">Err</span>(req) =&gt; {
                 <span class="macro">debug!</span>(<span class="string">&quot;connection was not ready&quot;</span>);
                 <span class="kw">let </span>err = <span class="kw">crate</span>::Error::new_canceled().with(<span class="string">&quot;connection was not ready&quot;</span>);
                 Either::Right(future::err((err, <span class="prelude-val">Some</span>(req))))
             }
         }
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">impl</span>&lt;B&gt; fmt::Debug <span class="kw">for </span>Http2SendRequest&lt;B&gt; {
     <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.debug_struct(<span class="string">&quot;Http2SendRequest&quot;</span>).finish()
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
 </span><span class="kw">impl</span>&lt;B&gt; Clone <span class="kw">for </span>Http2SendRequest&lt;B&gt; {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         Http2SendRequest {
             dispatch: <span class="self">self</span>.dispatch.clone(),
         }
     }
 }

 <span class="comment">// ===== impl Connection

 </span><span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;T, B&gt; Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin + Send + <span class="lifetime">&#39;static</span>,
     B: HttpBody + Unpin + Send + <span class="lifetime">&#39;static</span>,
     B::Data: Send,
     B::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
 {
     <span class="doccomment">/// Return the inner IO object, and additional information.
     ///
     /// Only works for HTTP/1 connections. HTTP/2 connections will panic.
     </span><span class="kw">pub fn </span>into_parts(<span class="self">self</span>) -&gt; Parts&lt;T&gt; {
         <span class="kw">match </span><span class="self">self</span>.inner.expect(<span class="string">&quot;already upgraded&quot;</span>) {
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
             </span>ProtoClient::H1 { h1 } =&gt; {
                 <span class="kw">let </span>(io, read_buf, <span class="kw">_</span>) = h1.into_inner();
                 Parts {
                     io,
                     read_buf,
                     _inner: (),
                 }
             }
             ProtoClient::H2 { .. } =&gt; {
                 <span class="macro">panic!</span>(<span class="string">&quot;http2 cannot into_inner&quot;</span>);
             }

             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http1&quot;</span>))]
             </span>ProtoClient::H1 { h1 } =&gt; <span class="kw">match </span>h1.<span class="number">0 </span>{},
         }
     }

     <span class="doccomment">/// Poll the connection for completion, but without calling `shutdown`
     /// on the underlying IO.
     ///
     /// This is useful to allow running a connection while doing an HTTP
     /// upgrade. Once the upgrade is completed, the connection would be &quot;done&quot;,
     /// but it is not desired to actually shutdown the IO object. Instead you
     /// would take it back using `into_parts`.
     ///
     /// Use [`poll_fn`](https://docs.rs/futures/0.1.25/futures/future/fn.poll_fn.html)
     /// and [`try_ready!`](https://docs.rs/futures/0.1.25/futures/macro.try_ready.html)
     /// to work with this function; or use the `without_shutdown` wrapper.
     </span><span class="kw">pub fn </span>poll_without_shutdown(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="kw">crate</span>::Result&lt;()&gt;&gt; {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self</span>.inner.as_mut().expect(<span class="string">&quot;already upgraded&quot;</span>) {
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
             </span>ProtoClient::H1 { <span class="kw-2">ref mut </span>h1 } =&gt; h1.poll_without_shutdown(cx),
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
             </span>ProtoClient::H2 { <span class="kw-2">ref mut </span>h2, .. } =&gt; Pin::new(h2).poll(cx).map_ok(|<span class="kw">_</span>| ()),

             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http1&quot;</span>))]
             </span>ProtoClient::H1 { <span class="kw-2">ref mut </span>h1 } =&gt; <span class="kw">match </span>h1.<span class="number">0 </span>{},
             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http2&quot;</span>))]
             </span>ProtoClient::H2 { <span class="kw-2">ref mut </span>h2, .. } =&gt; <span class="kw">match </span>h2.<span class="number">0 </span>{},
         }
     }

     <span class="doccomment">/// Prevent shutdown of the underlying IO object at the end of service the request,
     /// instead run `into_parts`. This is a convenience wrapper over `poll_without_shutdown`.
     </span><span class="kw">pub fn </span>without_shutdown(<span class="self">self</span>) -&gt; <span class="kw">impl </span>Future&lt;Output = <span class="kw">crate</span>::Result&lt;Parts&lt;T&gt;&gt;&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>conn = <span class="prelude-val">Some</span>(<span class="self">self</span>);
         future::poll_fn(<span class="kw">move </span>|cx| -&gt; Poll&lt;<span class="kw">crate</span>::Result&lt;Parts&lt;T&gt;&gt;&gt; {
             <span class="macro">ready!</span>(conn.as_mut().unwrap().poll_without_shutdown(cx))<span class="question-mark">?</span>;
             Poll::Ready(<span class="prelude-val">Ok</span>(conn.take().unwrap().into_parts()))
         })
     }

     <span class="doccomment">/// Returns whether the [extended CONNECT protocol][1] is enabled or not.
     ///
     /// This setting is configured by the server peer by sending the
     /// [`SETTINGS_ENABLE_CONNECT_PROTOCOL` parameter][2] in a `SETTINGS` frame.
     /// This method returns the currently acknowledged value received from the
     /// remote.
     ///
     /// [1]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
     /// [2]: https://datatracker.ietf.org/doc/html/rfc8441#section-3
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     </span><span class="kw">pub fn </span>http2_is_extended_connect_protocol_enabled(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="kw">match </span><span class="self">self</span>.inner.as_ref().unwrap() {
             ProtoClient::H1 { .. } =&gt; <span class="bool-val">false</span>,
             ProtoClient::H2 { h2 } =&gt; h2.is_extended_connect_protocol_enabled(),
         }
     }
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;T, B&gt; Future <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin + Send,
     B: HttpBody + Send + <span class="lifetime">&#39;static</span>,
     B::Data: Send,
     B::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
 {
     <span class="kw">type </span>Output = <span class="kw">crate</span>::Result&lt;()&gt;;

     <span class="kw">fn </span>poll(<span class="kw-2">mut </span><span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">match </span><span class="macro">ready!</span>(Pin::new(<span class="self">self</span>.inner.as_mut().unwrap()).poll(cx))<span class="question-mark">? </span>{
             proto::Dispatched::Shutdown =&gt; Poll::Ready(<span class="prelude-val">Ok</span>(())),
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
             </span>proto::Dispatched::Upgrade(pending) =&gt; <span class="kw">match </span><span class="self">self</span>.inner.take() {
                 <span class="prelude-val">Some</span>(ProtoClient::H1 { h1 }) =&gt; {
                     <span class="kw">let </span>(io, buf, <span class="kw">_</span>) = h1.into_inner();
                     pending.fulfill(Upgraded::new(io, buf));
                     Poll::Ready(<span class="prelude-val">Ok</span>(()))
                 }
                 <span class="kw">_ </span>=&gt; {
                     drop(pending);
                     <span class="macro">unreachable!</span>(<span class="string">&quot;Upgrade expects h1&quot;</span>);
                 }
             },
         }
     }
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl</span>&lt;T, B&gt; fmt::Debug <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + fmt::Debug + Send + <span class="lifetime">&#39;static</span>,
     B: HttpBody + <span class="lifetime">&#39;static</span>,
 {
     <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.debug_struct(<span class="string">&quot;Connection&quot;</span>).finish()
     }
 }

 <span class="comment">// ===== impl Builder

 </span><span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 </span><span class="kw">impl </span>Builder {
     <span class="doccomment">/// Creates a new connection builder.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>new() -&gt; Builder {
         Builder {
             exec: Exec::Default,
             h09_responses: <span class="bool-val">false</span>,
             h1_writev: <span class="prelude-val">None</span>,
             h1_read_buf_exact_size: <span class="prelude-val">None</span>,
             h1_parser_config: Default::default(),
             h1_title_case_headers: <span class="bool-val">false</span>,
             h1_preserve_header_case: <span class="bool-val">false</span>,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
             </span>h1_preserve_header_order: <span class="bool-val">false</span>,
             h1_max_buf_size: <span class="prelude-val">None</span>,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
             </span>h1_headers_raw: <span class="bool-val">false</span>,
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
             </span>h2_builder: Default::default(),
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
             </span>version: Proto::Http1,
             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http1&quot;</span>))]
             </span>version: Proto::Http2,
         }
     }

     <span class="doccomment">/// Provide an executor to execute background HTTP2 tasks.
     </span><span class="kw">pub fn </span>executor&lt;E&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, exec: E) -&gt; <span class="kw-2">&amp;mut </span>Builder
     <span class="kw">where
         </span>E: Executor&lt;BoxSendFuture&gt; + Send + Sync + <span class="lifetime">&#39;static</span>,
     {
         <span class="self">self</span>.exec = Exec::Executor(Arc::new(exec));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/0.9 responses should be tolerated.
     ///
     /// Default is false.
     </span><span class="kw">pub fn </span>http09_responses(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h09_responses = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/1 connections will accept spaces between header names
     /// and the colon that follow them in responses.
     ///
     /// You probably don&#39;t need this, here is what [RFC 7230 Section 3.2.4.] has
     /// to say about it:
     ///
     /// &gt; No whitespace is allowed between the header field-name and colon. In
     /// &gt; the past, differences in the handling of such whitespace have led to
     /// &gt; security vulnerabilities in request routing and response handling. A
     /// &gt; server MUST reject any received request message that contains
     /// &gt; whitespace between a header field-name and colon with a response code
     /// &gt; of 400 (Bad Request). A proxy MUST remove any such whitespace from a
     /// &gt; response message before forwarding the message downstream.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     ///
     /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
     </span><span class="kw">pub fn </span>http1_allow_spaces_after_header_name_in_responses(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         enabled: bool,
     ) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_parser_config
             .allow_spaces_after_header_name_in_responses(enabled);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/1 connections will accept obsolete line folding for
     /// header values.
     ///
     /// Newline codepoints (`\r` and `\n`) will be transformed to spaces when
     /// parsing.
     ///
     /// You probably don&#39;t need this, here is what [RFC 7230 Section 3.2.4.] has
     /// to say about it:
     ///
     /// &gt; A server that receives an obs-fold in a request message that is not
     /// &gt; within a message/http container MUST either reject the message by
     /// &gt; sending a 400 (Bad Request), preferably with a representation
     /// &gt; explaining that obsolete line folding is unacceptable, or replace
     /// &gt; each received obs-fold with one or more SP octets prior to
     /// &gt; interpreting the field value or forwarding the message downstream.
     ///
     /// &gt; A proxy or gateway that receives an obs-fold in a response message
     /// &gt; that is not within a message/http container MUST either discard the
     /// &gt; message and replace it with a 502 (Bad Gateway) response, preferably
     /// &gt; with a representation explaining that unacceptable line folding was
     /// &gt; received, or replace each received obs-fold with one or more SP
     /// &gt; octets prior to interpreting the field value or forwarding the
     /// &gt; message downstream.
     ///
     /// &gt; A user agent that receives an obs-fold in a response message that is
     /// &gt; not within a message/http container MUST replace each received
     /// &gt; obs-fold with one or more SP octets prior to interpreting the field
     /// &gt; value.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     ///
     /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
     </span><span class="kw">pub fn </span>http1_allow_obsolete_multiline_headers_in_responses(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         enabled: bool,
     ) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_parser_config
             .allow_obsolete_multiline_headers_in_responses(enabled);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/1 connections will silently ignored malformed header lines.
     ///
     /// If this is enabled and and a header line does not start with a valid header
     /// name, or does not include a colon at all, the line will be silently ignored
     /// and no error will be reported.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     </span><span class="kw">pub fn </span>http1_ignore_invalid_headers_in_responses(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         enabled: bool,
     ) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_parser_config
             .ignore_invalid_headers_in_responses(enabled);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/1 connections should try to use vectored writes,
     /// or always flatten into a single buffer.
     ///
     /// Note that setting this to false may mean more copies of body data,
     /// but may also improve performance when an IO transport doesn&#39;t
     /// support vectored writes well, such as most TLS implementations.
     ///
     /// Setting this to true will force hyper to use queued strategy
     /// which may eliminate unnecessary cloning on some TLS backends
     ///
     /// Default is `auto`. In this mode hyper will try to guess which
     /// mode to use
     </span><span class="kw">pub fn </span>http1_writev(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_writev = <span class="prelude-val">Some</span>(enabled);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether HTTP/1 connections will write header names as title case at
     /// the socket level.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     </span><span class="kw">pub fn </span>http1_title_case_headers(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_title_case_headers = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether to support preserving original header cases.
     ///
     /// Currently, this will record the original cases received, and store them
     /// in a private extension on the `Response`. It will also look for and use
     /// such an extension in any provided `Request`.
     ///
     /// Since the relevant extension is still private, there is no way to
     /// interact with the original cases. The only effect this can have now is
     /// to forward the cases in a proxy-like fashion.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     </span><span class="kw">pub fn </span>http1_preserve_header_case(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_preserve_header_case = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set whether to support preserving original header order.
     ///
     /// Currently, this will record the order in which headers are received, and store this
     /// ordering in a private extension on the `Response`. It will also look for and use
     /// such an extension in any provided `Request`.
     ///
     /// Note that this setting does not affect HTTP/2.
     ///
     /// Default is false.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
     </span><span class="kw">pub fn </span>http1_preserve_header_order(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_preserve_header_order = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the exact size of the read buffer to *always* use.
     ///
     /// Note that setting this option unsets the `http1_max_buf_size` option.
     ///
     /// Default is an adaptive read buffer.
     </span><span class="kw">pub fn </span>http1_read_buf_exact_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: <span class="prelude-ty">Option</span>&lt;usize&gt;) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="self">self</span>.h1_read_buf_exact_size = sz;
         <span class="self">self</span>.h1_max_buf_size = <span class="prelude-val">None</span>;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set the maximum buffer size for the connection.
     ///
     /// Default is ~400kb.
     ///
     /// Note that setting this option unsets the `http1_read_exact_buf_size` option.
     ///
     /// # Panics
     ///
     /// The minimum value allowed is 8192. This method panics if the passed `max` is less than the minimum.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http1&quot;</span>)))]
     </span><span class="kw">pub fn </span>http1_max_buf_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: usize) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="macro">assert!</span>(
             max &gt;= proto::h1::MINIMUM_MAX_BUFFER_SIZE,
             <span class="string">&quot;the max_buf_size cannot be smaller than the minimum that h1 specifies.&quot;
         </span>);

         <span class="self">self</span>.h1_max_buf_size = <span class="prelude-val">Some</span>(max);
         <span class="self">self</span>.h1_read_buf_exact_size = <span class="prelude-val">None</span>;
         <span class="self">self
     </span>}

     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>http1_headers_raw(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.h1_headers_raw = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets whether HTTP2 is required.
     ///
     /// Default is false.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_only(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span>Builder {
         <span class="kw">if </span>enabled {
             <span class="self">self</span>.version = Proto::Http2
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the [`SETTINGS_INITIAL_WINDOW_SIZE`][spec] option for HTTP2
     /// stream-level flow control.
     ///
     /// Passing `None` will do nothing.
     ///
     /// If not set, hyper will use a default.
     ///
     /// [spec]: https://http2.github.io/http2-spec/#SETTINGS_INITIAL_WINDOW_SIZE
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_initial_stream_window_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;u32&gt;&gt;) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = sz.into() {
             <span class="self">self</span>.h2_builder.adaptive_window = <span class="bool-val">false</span>;
             <span class="self">self</span>.h2_builder.initial_stream_window_size = sz;
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the max connection-level flow control for HTTP2
     ///
     /// Passing `None` will do nothing.
     ///
     /// If not set, hyper will use a default.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_initial_connection_window_size(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         sz: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;u32&gt;&gt;,
     ) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = sz.into() {
             <span class="self">self</span>.h2_builder.adaptive_window = <span class="bool-val">false</span>;
             <span class="self">self</span>.h2_builder.initial_conn_window_size = sz;
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets whether to use an adaptive flow control.
     ///
     /// Enabling this will override the limits set in
     /// `http2_initial_stream_window_size` and
     /// `http2_initial_connection_window_size`.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_adaptive_window(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="kw">use </span>proto::h2::SPEC_WINDOW_SIZE;

         <span class="self">self</span>.h2_builder.adaptive_window = enabled;
         <span class="kw">if </span>enabled {
             <span class="self">self</span>.h2_builder.initial_conn_window_size = SPEC_WINDOW_SIZE;
             <span class="self">self</span>.h2_builder.initial_stream_window_size = SPEC_WINDOW_SIZE;
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum frame size to use for HTTP2.
     ///
     /// Passing `None` will do nothing.
     ///
     /// If not set, hyper will use a default.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_max_frame_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, sz: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;u32&gt;&gt;) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = sz.into() {
             <span class="self">self</span>.h2_builder.max_frame_size = sz;
         }
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets an interval for HTTP2 Ping frames should be sent to keep a
     /// connection alive.
     ///
     /// Pass `None` to disable HTTP2 keep-alive.
     ///
     /// Default is currently disabled.
     ///
     /// # Cargo Feature
     ///
     /// Requires the `runtime` cargo feature to be enabled.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
     #[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_keep_alive_interval(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         interval: <span class="kw">impl </span>Into&lt;<span class="prelude-ty">Option</span>&lt;Duration&gt;&gt;,
     ) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.h2_builder.keep_alive_interval = interval.into();
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets a timeout for receiving an acknowledgement of the keep-alive ping.
     ///
     /// If the ping is not acknowledged within the timeout, the connection will
     /// be closed. Does nothing if `http2_keep_alive_interval` is disabled.
     ///
     /// Default is 20 seconds.
     ///
     /// # Cargo Feature
     ///
     /// Requires the `runtime` cargo feature to be enabled.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
     #[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_keep_alive_timeout(<span class="kw-2">&amp;mut </span><span class="self">self</span>, timeout: Duration) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.h2_builder.keep_alive_timeout = timeout;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets whether HTTP2 keep-alive should apply while the connection is idle.
     ///
     /// If disabled, keep-alive pings are only sent while there are open
     /// request/responses streams. If enabled, pings are also sent when no
     /// streams are active. Does nothing if `http2_keep_alive_interval` is
     /// disabled.
     ///
     /// Default is `false`.
     ///
     /// # Cargo Feature
     ///
     /// Requires the `runtime` cargo feature to be enabled.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;runtime&quot;</span>)]
     #[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_keep_alive_while_idle(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.h2_builder.keep_alive_while_idle = enabled;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of HTTP2 concurrent locally reset streams.
     ///
     /// See the documentation of [`h2::client::Builder::max_concurrent_reset_streams`] for more
     /// details.
     ///
     /// The default value is determined by the `h2` crate.
     ///
     /// [`h2::client::Builder::max_concurrent_reset_streams`]: https://docs.rs/h2/client/struct.Builder.html#method.max_concurrent_reset_streams
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_max_concurrent_reset_streams(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: usize) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.h2_builder.max_concurrent_reset_streams = <span class="prelude-val">Some</span>(max);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Set the maximum write buffer size for each HTTP/2 stream.
     ///
     /// Default is currently 1MB, but may change.
     ///
     /// # Panics
     ///
     /// The value must be no larger than `u32::MAX`.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
     #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;http2&quot;</span>)))]
     </span><span class="kw">pub fn </span>http2_max_send_buf_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: usize) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="macro">assert!</span>(max &lt;= std::u32::MAX <span class="kw">as </span>usize);
         <span class="self">self</span>.h2_builder.max_send_buffer_size = max;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Constructs a connection with the configured options and IO.
     /// See [`client::conn`](crate::client::conn) for more.
     ///
     /// Note, if [`Connection`] is not `await`-ed, [`SendRequest`] will
     /// do nothing.
     </span><span class="kw">pub fn </span>handshake&lt;T, B&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         io: T,
     ) -&gt; <span class="kw">impl </span>Future&lt;Output = <span class="kw">crate</span>::Result&lt;(SendRequest&lt;B&gt;, Connection&lt;T, B&gt;)&gt;&gt;
     <span class="kw">where
         </span>T: AsyncRead + AsyncWrite + Unpin + Send + <span class="lifetime">&#39;static</span>,
         B: HttpBody + <span class="lifetime">&#39;static</span>,
         B::Data: Send,
         B::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
     {
         <span class="kw">let </span>opts = <span class="self">self</span>.clone();

         <span class="kw">async move </span>{
             <span class="macro">trace!</span>(<span class="string">&quot;client handshake {:?}&quot;</span>, opts.version);

             <span class="kw">let </span>(tx, rx) = dispatch::channel();
             <span class="kw">let </span>proto = <span class="kw">match </span>opts.version {
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
                 </span>Proto::Http1 =&gt; {
                     <span class="kw">let </span><span class="kw-2">mut </span>conn = proto::Conn::new(io);
                     conn.set_h1_parser_config(opts.h1_parser_config);
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(writev) = opts.h1_writev {
                         <span class="kw">if </span>writev {
                             conn.set_write_strategy_queue();
                         } <span class="kw">else </span>{
                             conn.set_write_strategy_flatten();
                         }
                     }
                     <span class="kw">if </span>opts.h1_title_case_headers {
                         conn.set_title_case_headers();
                     }
                     <span class="kw">if </span>opts.h1_preserve_header_case {
                         conn.set_preserve_header_case();
                     }
                     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                     </span><span class="kw">if </span>opts.h1_preserve_header_order {
                         conn.set_preserve_header_order();
                     }
                     <span class="kw">if </span>opts.h09_responses {
                         conn.set_h09_responses();
                     }

                     <span class="attribute">#[cfg(feature = <span class="string">&quot;ffi&quot;</span>)]
                     </span>conn.set_raw_headers(opts.h1_headers_raw);

                     <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = opts.h1_read_buf_exact_size {
                         conn.set_read_buf_exact_size(sz);
                     }
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(max) = opts.h1_max_buf_size {
                         conn.set_max_buf_size(max);
                     }
                     <span class="kw">let </span>cd = proto::h1::dispatch::Client::new(rx);
                     <span class="kw">let </span>dispatch = proto::h1::Dispatcher::new(cd, conn);
                     ProtoClient::H1 { h1: dispatch }
                 }
                 <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
                 </span>Proto::Http2 =&gt; {
                     <span class="kw">let </span>h2 =
                         proto::h2::client::handshake(io, rx, <span class="kw-2">&amp;</span>opts.h2_builder, opts.exec.clone())
                             .<span class="kw">await</span><span class="question-mark">?</span>;
                     ProtoClient::H2 { h2 }
                 }
             };

             <span class="prelude-val">Ok</span>((
                 SendRequest { dispatch: tx },
                 Connection { inner: <span class="prelude-val">Some</span>(proto) },
             ))
         }
     }
 }

 <span class="comment">// ===== impl ResponseFuture

 </span><span class="kw">impl </span>Future <span class="kw">for </span>ResponseFuture {
     <span class="kw">type </span>Output = <span class="kw">crate</span>::Result&lt;Response&lt;Body&gt;&gt;;

     <span class="kw">fn </span>poll(<span class="kw-2">mut </span><span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">match </span><span class="self">self</span>.inner {
             ResponseFutureState::Waiting(<span class="kw-2">ref mut </span>rx) =&gt; {
                 Pin::new(rx).poll(cx).map(|res| <span class="kw">match </span>res {
                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Ok</span>(resp)) =&gt; <span class="prelude-val">Ok</span>(resp),
                     <span class="prelude-val">Ok</span>(<span class="prelude-val">Err</span>(err)) =&gt; <span class="prelude-val">Err</span>(err),
                     <span class="comment">// this is definite bug if it happens, but it shouldn&#39;t happen!
                     </span><span class="prelude-val">Err</span>(_canceled) =&gt; <span class="macro">panic!</span>(<span class="string">&quot;dispatch dropped without returning error&quot;</span>),
                 })
             }
             ResponseFutureState::Error(<span class="kw-2">ref mut </span>err) =&gt; {
                 Poll::Ready(<span class="prelude-val">Err</span>(err.take().expect(<span class="string">&quot;polled after ready&quot;</span>)))
             }
         }
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ResponseFuture {
     <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.debug_struct(<span class="string">&quot;ResponseFuture&quot;</span>).finish()
     }
 }

 <span class="comment">// ===== impl ProtoClient

 </span><span class="kw">impl</span>&lt;T, B&gt; Future <span class="kw">for </span>ProtoClient&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Send + Unpin + <span class="lifetime">&#39;static</span>,
     B: HttpBody + Send + <span class="lifetime">&#39;static</span>,
     B::Data: Send,
     B::Error: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
 {
     <span class="kw">type </span>Output = <span class="kw">crate</span>::Result&lt;proto::Dispatched&gt;;

     <span class="kw">fn </span>poll(<span class="self">self</span>: Pin&lt;<span class="kw-2">&amp;mut </span><span class="self">Self</span>&gt;, cx: <span class="kw-2">&amp;mut </span>task::Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">match </span><span class="self">self</span>.project() {
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http1&quot;</span>)]
             </span>ProtoClientProj::H1 { h1 } =&gt; h1.poll(cx),
             <span class="attribute">#[cfg(feature = <span class="string">&quot;http2&quot;</span>)]
             </span>ProtoClientProj::H2 { h2, .. } =&gt; h2.poll(cx),

             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http1&quot;</span>))]
             </span>ProtoClientProj::H1 { h1 } =&gt; <span class="kw">match </span>h1.<span class="number">0 </span>{},
             <span class="attribute">#[cfg(not(feature = <span class="string">&quot;http2&quot;</span>))]
             </span>ProtoClientProj::H2 { h2, .. } =&gt; <span class="kw">match </span>h2.<span class="number">0 </span>{},
         }
     }
 }

 <span class="comment">// assert trait markers

 </span><span class="kw">trait </span>AssertSend: Send {}
 <span class="kw">trait </span>AssertSendSync: Send + Sync {}

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 #[doc(hidden)]
 </span><span class="kw">impl</span>&lt;B: Send&gt; AssertSendSync <span class="kw">for </span>SendRequest&lt;B&gt; {}

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 #[doc(hidden)]
 </span><span class="kw">impl</span>&lt;T: Send, B: Send&gt; AssertSend <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Send + <span class="lifetime">&#39;static</span>,
     B: HttpBody + <span class="lifetime">&#39;static</span>,
     B::Data: Send,
 {
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 #[doc(hidden)]
 </span><span class="kw">impl</span>&lt;T: Send + Sync, B: Send + Sync&gt; AssertSendSync <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Send + <span class="lifetime">&#39;static</span>,
     B: HttpBody + <span class="lifetime">&#39;static</span>,
     B::Data: Send + Sync + <span class="lifetime">&#39;static</span>,
 {
 }

 <span class="attribute">#[cfg_attr(feature = <span class="string">&quot;deprecated&quot;</span>, allow(deprecated))]
 #[doc(hidden)]
 </span><span class="kw">impl </span>AssertSendSync <span class="kw">for </span>Builder {}

 <span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl </span>AssertSend <span class="kw">for </span>ResponseFuture {}
 </code></pre></div>
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