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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/connect/http.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>http.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="kw">use </span>std::error::Error <span class="kw">as </span>StdError;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::future::Future;
 <span class="kw">use </span>std::io;
 <span class="kw">use </span>std::marker::PhantomData;
 <span class="kw">use </span>std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
 <span class="kw">use </span>std::pin::Pin;
 <span class="kw">use </span>std::sync::Arc;
 <span class="kw">use </span>std::task::{<span class="self">self</span>, Poll};
 <span class="kw">use </span>std::time::Duration;

 <span class="kw">use </span>futures_util::future::Either;
 <span class="kw">use </span>http::uri::{Scheme, Uri};
 <span class="kw">use </span>pin_project_lite::pin_project;
 <span class="kw">use </span>tokio::net::{TcpSocket, TcpStream};
 <span class="kw">use </span>tokio::time::Sleep;
 <span class="kw">use </span>tracing::{debug, trace, warn};

 <span class="kw">use </span><span class="kw">super</span>::dns::{<span class="self">self</span>, resolve, GaiResolver, Resolve};
 <span class="kw">use super</span>::{Connected, Connection};
 <span class="comment">//#[cfg(feature = &quot;runtime&quot;)] use super::dns::TokioThreadpoolGaiResolver;

 </span><span class="doccomment">/// A connector for the `http` scheme.
 ///
 /// Performs DNS resolution in a thread pool, and then connects over TCP.
 ///
 /// # Note
 ///
 /// Sets the [`HttpInfo`](HttpInfo) value on responses, which includes
 /// transport information such as the remote socket address used.
 </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;tcp&quot;</span>)))]
 #[derive(Clone)]
 </span><span class="kw">pub struct </span>HttpConnector&lt;R = GaiResolver&gt; {
     config: Arc&lt;Config&gt;,
     resolver: R,
 }

 <span class="doccomment">/// Extra information about the transport when an HttpConnector is used.
 ///
 /// # Example
 ///
 /// ```
 /// # async fn doc() -&gt; hyper::Result&lt;()&gt; {
 /// use hyper::Uri;
 /// use hyper::client::{Client, connect::HttpInfo};
 ///
 /// let client = Client::new();
 /// let uri = Uri::from_static(&quot;http://example.com&quot;);
 ///
 /// let res = client.get(uri).await?;
 /// res
 ///     .extensions()
 ///     .get::&lt;HttpInfo&gt;()
 ///     .map(|info| {
 ///         println!(&quot;remote addr = {}&quot;, info.remote_addr());
 ///     });
 /// # Ok(())
 /// # }
 /// ```
 ///
 /// # Note
 ///
 /// If a different connector is used besides [`HttpConnector`](HttpConnector),
 /// this value will not exist in the extensions. Consult that specific
 /// connector to see what &quot;extra&quot; information it might provide to responses.
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>HttpInfo {
     remote_addr: SocketAddr,
     local_addr: SocketAddr,
 }

 <span class="attribute">#[derive(Clone)]
 </span><span class="kw">struct </span>Config {
     connect_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;,
     enforce_http: bool,
     happy_eyeballs_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;,
     keep_alive_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;,
     local_address_ipv4: <span class="prelude-ty">Option</span>&lt;Ipv4Addr&gt;,
     local_address_ipv6: <span class="prelude-ty">Option</span>&lt;Ipv6Addr&gt;,
     nodelay: bool,
     reuse_address: bool,
     send_buffer_size: <span class="prelude-ty">Option</span>&lt;usize&gt;,
     recv_buffer_size: <span class="prelude-ty">Option</span>&lt;usize&gt;,
 }

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

 </span><span class="kw">impl </span>HttpConnector {
     <span class="doccomment">/// Construct a new HttpConnector.
     </span><span class="kw">pub fn </span>new() -&gt; HttpConnector {
         HttpConnector::new_with_resolver(GaiResolver::new())
     }
 }

 <span class="comment">/*
 #[cfg(feature = &quot;runtime&quot;)]
 impl HttpConnector&lt;TokioThreadpoolGaiResolver&gt; {
     /// Construct a new HttpConnector using the `TokioThreadpoolGaiResolver`.
     ///
     /// This resolver **requires** the threadpool runtime to be used.
     pub fn new_with_tokio_threadpool_resolver() -&gt; Self {
         HttpConnector::new_with_resolver(TokioThreadpoolGaiResolver::new())
     }
 }
 */

 </span><span class="kw">impl</span>&lt;R&gt; HttpConnector&lt;R&gt; {
     <span class="doccomment">/// Construct a new HttpConnector.
     ///
     /// Takes a [`Resolver`](crate::client::connect::dns#resolvers-are-services) to handle DNS lookups.
     </span><span class="kw">pub fn </span>new_with_resolver(resolver: R) -&gt; HttpConnector&lt;R&gt; {
         HttpConnector {
             config: Arc::new(Config {
                 connect_timeout: <span class="prelude-val">None</span>,
                 enforce_http: <span class="bool-val">true</span>,
                 happy_eyeballs_timeout: <span class="prelude-val">Some</span>(Duration::from_millis(<span class="number">300</span>)),
                 keep_alive_timeout: <span class="prelude-val">None</span>,
                 local_address_ipv4: <span class="prelude-val">None</span>,
                 local_address_ipv6: <span class="prelude-val">None</span>,
                 nodelay: <span class="bool-val">false</span>,
                 reuse_address: <span class="bool-val">false</span>,
                 send_buffer_size: <span class="prelude-val">None</span>,
                 recv_buffer_size: <span class="prelude-val">None</span>,
             }),
             resolver,
         }
     }

     <span class="doccomment">/// Option to enforce all `Uri`s have the `http` scheme.
     ///
     /// Enabled by default.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>enforce_http(<span class="kw-2">&amp;mut </span><span class="self">self</span>, is_enforced: bool) {
         <span class="self">self</span>.config_mut().enforce_http = is_enforced;
     }

     <span class="doccomment">/// Set that all sockets have `SO_KEEPALIVE` set with the supplied duration.
     ///
     /// If `None`, the option will not be set.
     ///
     /// Default is `None`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_keepalive(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dur: <span class="prelude-ty">Option</span>&lt;Duration&gt;) {
         <span class="self">self</span>.config_mut().keep_alive_timeout = dur;
     }

     <span class="doccomment">/// Set that all sockets have `SO_NODELAY` set to the supplied value `nodelay`.
     ///
     /// Default is `false`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_nodelay(<span class="kw-2">&amp;mut </span><span class="self">self</span>, nodelay: bool) {
         <span class="self">self</span>.config_mut().nodelay = nodelay;
     }

     <span class="doccomment">/// Sets the value of the SO_SNDBUF option on the socket.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_send_buffer_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         <span class="self">self</span>.config_mut().send_buffer_size = size;
     }

     <span class="doccomment">/// Sets the value of the SO_RCVBUF option on the socket.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_recv_buffer_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         <span class="self">self</span>.config_mut().recv_buffer_size = size;
     }

     <span class="doccomment">/// Set that all sockets are bound to the configured address before connection.
     ///
     /// If `None`, the sockets will not be bound.
     ///
     /// Default is `None`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_local_address(<span class="kw-2">&amp;mut </span><span class="self">self</span>, addr: <span class="prelude-ty">Option</span>&lt;IpAddr&gt;) {
         <span class="kw">let </span>(v4, v6) = <span class="kw">match </span>addr {
             <span class="prelude-val">Some</span>(IpAddr::V4(a)) =&gt; (<span class="prelude-val">Some</span>(a), <span class="prelude-val">None</span>),
             <span class="prelude-val">Some</span>(IpAddr::V6(a)) =&gt; (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(a)),
             <span class="kw">_ </span>=&gt; (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>),
         };

         <span class="kw">let </span>cfg = <span class="self">self</span>.config_mut();

         cfg.local_address_ipv4 = v4;
         cfg.local_address_ipv6 = v6;
     }

     <span class="doccomment">/// Set that all sockets are bound to the configured IPv4 or IPv6 address (depending on host&#39;s
     /// preferences) before connection.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_local_addresses(<span class="kw-2">&amp;mut </span><span class="self">self</span>, addr_ipv4: Ipv4Addr, addr_ipv6: Ipv6Addr) {
         <span class="kw">let </span>cfg = <span class="self">self</span>.config_mut();

         cfg.local_address_ipv4 = <span class="prelude-val">Some</span>(addr_ipv4);
         cfg.local_address_ipv6 = <span class="prelude-val">Some</span>(addr_ipv6);
     }

     <span class="doccomment">/// Set the connect timeout.
     ///
     /// If a domain resolves to multiple IP addresses, the timeout will be
     /// evenly divided across them.
     ///
     /// Default is `None`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_connect_timeout(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dur: <span class="prelude-ty">Option</span>&lt;Duration&gt;) {
         <span class="self">self</span>.config_mut().connect_timeout = dur;
     }

     <span class="doccomment">/// Set timeout for [RFC 6555 (Happy Eyeballs)][RFC 6555] algorithm.
     ///
     /// If hostname resolves to both IPv4 and IPv6 addresses and connection
     /// cannot be established using preferred address family before timeout
     /// elapses, then connector will in parallel attempt connection using other
     /// address family.
     ///
     /// If `None`, parallel connection attempts are disabled.
     ///
     /// Default is 300 milliseconds.
     ///
     /// [RFC 6555]: https://tools.ietf.org/html/rfc6555
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_happy_eyeballs_timeout(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dur: <span class="prelude-ty">Option</span>&lt;Duration&gt;) {
         <span class="self">self</span>.config_mut().happy_eyeballs_timeout = dur;
     }

     <span class="doccomment">/// Set that all socket have `SO_REUSEADDR` set to the supplied value `reuse_address`.
     ///
     /// Default is `false`.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>set_reuse_address(<span class="kw-2">&amp;mut </span><span class="self">self</span>, reuse_address: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.config_mut().reuse_address = reuse_address;
         <span class="self">self
     </span>}

     <span class="comment">// private

     </span><span class="kw">fn </span>config_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Config {
         <span class="comment">// If the are HttpConnector clones, this will clone the inner
         // config. So mutating the config won&#39;t ever affect previous
         // clones.
         </span>Arc::make_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>.config)
     }
 }

 <span class="kw">static </span>INVALID_NOT_HTTP: <span class="kw-2">&amp;</span>str = <span class="string">&quot;invalid URL, scheme is not http&quot;</span>;
 <span class="kw">static </span>INVALID_MISSING_SCHEME: <span class="kw-2">&amp;</span>str = <span class="string">&quot;invalid URL, scheme is missing&quot;</span>;
 <span class="kw">static </span>INVALID_MISSING_HOST: <span class="kw-2">&amp;</span>str = <span class="string">&quot;invalid URL, host is missing&quot;</span>;

 <span class="comment">// R: Debug required for now to allow adding it to debug output later...
 </span><span class="kw">impl</span>&lt;R: fmt::Debug&gt; fmt::Debug <span class="kw">for </span>HttpConnector&lt;R&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;HttpConnector&quot;</span>).finish()
     }
 }

 <span class="kw">impl</span>&lt;R&gt; tower_service::Service&lt;Uri&gt; <span class="kw">for </span>HttpConnector&lt;R&gt;
 <span class="kw">where
     </span>R: Resolve + Clone + Send + Sync + <span class="lifetime">&#39;static</span>,
     R::Future: Send,
 {
     <span class="kw">type </span>Response = TcpStream;
     <span class="kw">type </span>Error = ConnectError;
     <span class="kw">type </span>Future = HttpConnecting&lt;R&gt;;

     <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="macro">ready!</span>(<span class="self">self</span>.resolver.poll_ready(cx)).map_err(ConnectError::dns)<span class="question-mark">?</span>;
         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="kw">fn </span>call(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dst: Uri) -&gt; <span class="self">Self</span>::Future {
         <span class="kw">let </span><span class="kw-2">mut </span>self_ = <span class="self">self</span>.clone();
         HttpConnecting {
             fut: Box::pin(<span class="kw">async move </span>{ self_.call_async(dst).<span class="kw">await </span>}),
             _marker: PhantomData,
         }
     }
 }

 <span class="kw">fn </span>get_host_port&lt;<span class="lifetime">&#39;u</span>&gt;(config: <span class="kw-2">&amp;</span>Config, dst: <span class="kw-2">&amp;</span><span class="lifetime">&#39;u </span>Uri) -&gt; <span class="prelude-ty">Result</span>&lt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;u </span>str, u16), ConnectError&gt; {
     <span class="macro">trace!</span>(
         <span class="string">&quot;Http::connect; scheme={:?}, host={:?}, port={:?}&quot;</span>,
         dst.scheme(),
         dst.host(),
         dst.port(),
     );

     <span class="kw">if </span>config.enforce_http {
         <span class="kw">if </span>dst.scheme() != <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Scheme::HTTP) {
             <span class="kw">return </span><span class="prelude-val">Err</span>(ConnectError {
                 msg: INVALID_NOT_HTTP.into(),
                 cause: <span class="prelude-val">None</span>,
             });
         }
     } <span class="kw">else if </span>dst.scheme().is_none() {
         <span class="kw">return </span><span class="prelude-val">Err</span>(ConnectError {
             msg: INVALID_MISSING_SCHEME.into(),
             cause: <span class="prelude-val">None</span>,
         });
     }

     <span class="kw">let </span>host = <span class="kw">match </span>dst.host() {
         <span class="prelude-val">Some</span>(s) =&gt; s,
         <span class="prelude-val">None </span>=&gt; {
             <span class="kw">return </span><span class="prelude-val">Err</span>(ConnectError {
                 msg: INVALID_MISSING_HOST.into(),
                 cause: <span class="prelude-val">None</span>,
             })
         }
     };
     <span class="kw">let </span>port = <span class="kw">match </span>dst.port() {
         <span class="prelude-val">Some</span>(port) =&gt; port.as_u16(),
         <span class="prelude-val">None </span>=&gt; {
             <span class="kw">if </span>dst.scheme() == <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>Scheme::HTTPS) {
                 <span class="number">443
             </span>} <span class="kw">else </span>{
                 <span class="number">80
             </span>}
         }
     };

     <span class="prelude-val">Ok</span>((host, port))
 }

 <span class="kw">impl</span>&lt;R&gt; HttpConnector&lt;R&gt;
 <span class="kw">where
     </span>R: Resolve,
 {
     <span class="kw">async fn </span>call_async(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dst: Uri) -&gt; <span class="prelude-ty">Result</span>&lt;TcpStream, ConnectError&gt; {
         <span class="kw">let </span>config = <span class="kw-2">&amp;</span><span class="self">self</span>.config;

         <span class="kw">let </span>(host, port) = get_host_port(config, <span class="kw-2">&amp;</span>dst)<span class="question-mark">?</span>;
         <span class="kw">let </span>host = host.trim_start_matches(<span class="string">&#39;[&#39;</span>).trim_end_matches(<span class="string">&#39;]&#39;</span>);

         <span class="comment">// If the host is already an IP addr (v4 or v6),
         // skip resolving the dns and start connecting right away.
         </span><span class="kw">let </span>addrs = <span class="kw">if let </span><span class="prelude-val">Some</span>(addrs) = dns::SocketAddrs::try_parse(host, port) {
             addrs
         } <span class="kw">else </span>{
             <span class="kw">let </span>addrs = resolve(<span class="kw-2">&amp;mut </span><span class="self">self</span>.resolver, dns::Name::new(host.into()))
                 .<span class="kw">await
                 </span>.map_err(ConnectError::dns)<span class="question-mark">?</span>;
             <span class="kw">let </span>addrs = addrs
                 .map(|<span class="kw-2">mut </span>addr| {
                     addr.set_port(port);
                     addr
                 })
                 .collect();
             dns::SocketAddrs::new(addrs)
         };

         <span class="kw">let </span>c = ConnectingTcp::new(addrs, config);

         <span class="kw">let </span>sock = c.connect().<span class="kw">await</span><span class="question-mark">?</span>;

         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = sock.set_nodelay(config.nodelay) {
             <span class="macro">warn!</span>(<span class="string">&quot;tcp set_nodelay error: {}&quot;</span>, e);
         }

         <span class="prelude-val">Ok</span>(sock)
     }
 }

 <span class="kw">impl </span>Connection <span class="kw">for </span>TcpStream {
     <span class="kw">fn </span>connected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Connected {
         <span class="kw">let </span>connected = Connected::new();
         <span class="kw">if let </span>(<span class="prelude-val">Ok</span>(remote_addr), <span class="prelude-val">Ok</span>(local_addr)) = (<span class="self">self</span>.peer_addr(), <span class="self">self</span>.local_addr()) {
             connected.extra(HttpInfo { remote_addr, local_addr })
         } <span class="kw">else </span>{
             connected
         }
     }
 }

 <span class="kw">impl </span>HttpInfo {
     <span class="doccomment">/// Get the remote address of the transport used.
     </span><span class="kw">pub fn </span>remote_addr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SocketAddr {
         <span class="self">self</span>.remote_addr
     }

     <span class="doccomment">/// Get the local address of the transport used.
     </span><span class="kw">pub fn </span>local_addr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; SocketAddr {
         <span class="self">self</span>.local_addr
     }
 }

 <span class="macro">pin_project! </span>{
     <span class="comment">// Not publicly exported (so missing_docs doesn&#39;t trigger).
     //
     // We return this `Future` instead of the `Pin&lt;Box&lt;dyn Future&gt;&gt;` directly
     // so that users don&#39;t rely on it fitting in a `Pin&lt;Box&lt;dyn Future&gt;&gt;` slot
     // (and thus we can change the type in the future).
     </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
     #[allow(missing_debug_implementations)]
     </span><span class="kw">pub struct </span>HttpConnecting&lt;R&gt; {
         <span class="attribute">#[pin]
         </span>fut: BoxConnecting,
         _marker: PhantomData&lt;R&gt;,
     }
 }

 <span class="kw">type </span>ConnectResult = <span class="prelude-ty">Result</span>&lt;TcpStream, ConnectError&gt;;
 <span class="kw">type </span>BoxConnecting = Pin&lt;Box&lt;<span class="kw">dyn </span>Future&lt;Output = ConnectResult&gt; + Send&gt;&gt;;

 <span class="kw">impl</span>&lt;R: Resolve&gt; Future <span class="kw">for </span>HttpConnecting&lt;R&gt; {
     <span class="kw">type </span>Output = ConnectResult;

     <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="self">self</span>.project().fut.poll(cx)
     }
 }

 <span class="comment">// Not publicly exported (so missing_docs doesn&#39;t trigger).
 </span><span class="kw">pub struct </span>ConnectError {
     msg: Box&lt;str&gt;,
     cause: <span class="prelude-ty">Option</span>&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
 }

 <span class="kw">impl </span>ConnectError {
     <span class="kw">fn </span>new&lt;S, E&gt;(msg: S, cause: E) -&gt; ConnectError
     <span class="kw">where
         </span>S: Into&lt;Box&lt;str&gt;&gt;,
         E: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
     {
         ConnectError {
             msg: msg.into(),
             cause: <span class="prelude-val">Some</span>(cause.into()),
         }
     }

     <span class="kw">fn </span>dns&lt;E&gt;(cause: E) -&gt; ConnectError
     <span class="kw">where
         </span>E: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
     {
         ConnectError::new(<span class="string">&quot;dns error&quot;</span>, cause)
     }

     <span class="kw">fn </span>m&lt;S, E&gt;(msg: S) -&gt; <span class="kw">impl </span>FnOnce(E) -&gt; ConnectError
     <span class="kw">where
         </span>S: Into&lt;Box&lt;str&gt;&gt;,
         E: Into&lt;Box&lt;<span class="kw">dyn </span>StdError + Send + Sync&gt;&gt;,
     {
         <span class="kw">move </span>|cause| ConnectError::new(msg, cause)
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>ConnectError {
     <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 {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>cause) = <span class="self">self</span>.cause {
             f.debug_tuple(<span class="string">&quot;ConnectError&quot;</span>)
                 .field(<span class="kw-2">&amp;</span><span class="self">self</span>.msg)
                 .field(cause)
                 .finish()
         } <span class="kw">else </span>{
             <span class="self">self</span>.msg.fmt(f)
         }
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ConnectError {
     <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="kw-2">&amp;</span><span class="self">self</span>.msg)<span class="question-mark">?</span>;

         <span class="kw">if let </span><span class="prelude-val">Some</span>(<span class="kw-2">ref </span>cause) = <span class="self">self</span>.cause {
             <span class="macro">write!</span>(f, <span class="string">&quot;: {}&quot;</span>, cause)<span class="question-mark">?</span>;
         }

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

 <span class="kw">impl </span>StdError <span class="kw">for </span>ConnectError {
     <span class="kw">fn </span>source(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>(<span class="kw">dyn </span>StdError + <span class="lifetime">&#39;static</span>)&gt; {
         <span class="self">self</span>.cause.as_ref().map(|e| <span class="kw-2">&amp;**</span>e <span class="kw">as _</span>)
     }
 }

 <span class="kw">struct </span>ConnectingTcp&lt;<span class="lifetime">&#39;a</span>&gt; {
     preferred: ConnectingTcpRemote,
     fallback: <span class="prelude-ty">Option</span>&lt;ConnectingTcpFallback&gt;,
     config: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Config,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; ConnectingTcp&lt;<span class="lifetime">&#39;a</span>&gt; {
     <span class="kw">fn </span>new(remote_addrs: dns::SocketAddrs, config: <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Config) -&gt; <span class="self">Self </span>{
         <span class="kw">if let </span><span class="prelude-val">Some</span>(fallback_timeout) = config.happy_eyeballs_timeout {
             <span class="kw">let </span>(preferred_addrs, fallback_addrs) = remote_addrs
                 .split_by_preference(config.local_address_ipv4, config.local_address_ipv6);
             <span class="kw">if </span>fallback_addrs.is_empty() {
                 <span class="kw">return </span>ConnectingTcp {
                     preferred: ConnectingTcpRemote::new(preferred_addrs, config.connect_timeout),
                     fallback: <span class="prelude-val">None</span>,
                     config,
                 };
             }

             ConnectingTcp {
                 preferred: ConnectingTcpRemote::new(preferred_addrs, config.connect_timeout),
                 fallback: <span class="prelude-val">Some</span>(ConnectingTcpFallback {
                     delay: tokio::time::sleep(fallback_timeout),
                     remote: ConnectingTcpRemote::new(fallback_addrs, config.connect_timeout),
                 }),
                 config,
             }
         } <span class="kw">else </span>{
             ConnectingTcp {
                 preferred: ConnectingTcpRemote::new(remote_addrs, config.connect_timeout),
                 fallback: <span class="prelude-val">None</span>,
                 config,
             }
         }
     }
 }

 <span class="kw">struct </span>ConnectingTcpFallback {
     delay: Sleep,
     remote: ConnectingTcpRemote,
 }

 <span class="kw">struct </span>ConnectingTcpRemote {
     addrs: dns::SocketAddrs,
     connect_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;,
 }

 <span class="kw">impl </span>ConnectingTcpRemote {
     <span class="kw">fn </span>new(addrs: dns::SocketAddrs, connect_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;) -&gt; <span class="self">Self </span>{
         <span class="kw">let </span>connect_timeout = connect_timeout.map(|t| t / (addrs.len() <span class="kw">as </span>u32));

         <span class="self">Self </span>{
             addrs,
             connect_timeout,
         }
     }
 }

 <span class="kw">impl </span>ConnectingTcpRemote {
     <span class="kw">async fn </span>connect(<span class="kw-2">&amp;mut </span><span class="self">self</span>, config: <span class="kw-2">&amp;</span>Config) -&gt; <span class="prelude-ty">Result</span>&lt;TcpStream, ConnectError&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>err = <span class="prelude-val">None</span>;
         <span class="kw">for </span>addr <span class="kw">in </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.addrs {
             <span class="macro">debug!</span>(<span class="string">&quot;connecting to {}&quot;</span>, addr);
             <span class="kw">match </span>connect(<span class="kw-2">&amp;</span>addr, config, <span class="self">self</span>.connect_timeout)<span class="question-mark">?</span>.<span class="kw">await </span>{
                 <span class="prelude-val">Ok</span>(tcp) =&gt; {
                     <span class="macro">debug!</span>(<span class="string">&quot;connected to {}&quot;</span>, addr);
                     <span class="kw">return </span><span class="prelude-val">Ok</span>(tcp);
                 }
                 <span class="prelude-val">Err</span>(e) =&gt; {
                     <span class="macro">trace!</span>(<span class="string">&quot;connect error for {}: {:?}&quot;</span>, addr, e);
                     err = <span class="prelude-val">Some</span>(e);
                 }
             }
         }

         <span class="kw">match </span>err {
             <span class="prelude-val">Some</span>(e) =&gt; <span class="prelude-val">Err</span>(e),
             <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(ConnectError::new(
                 <span class="string">&quot;tcp connect error&quot;</span>,
                 std::io::Error::new(std::io::ErrorKind::NotConnected, <span class="string">&quot;Network unreachable&quot;</span>),
             )),
         }
     }
 }

 <span class="kw">fn </span>bind_local_address(
     socket: <span class="kw-2">&amp;</span>socket2::Socket,
     dst_addr: <span class="kw-2">&amp;</span>SocketAddr,
     local_addr_ipv4: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;Ipv4Addr&gt;,
     local_addr_ipv6: <span class="kw-2">&amp;</span><span class="prelude-ty">Option</span>&lt;Ipv6Addr&gt;,
 ) -&gt; io::Result&lt;()&gt; {
     <span class="kw">match </span>(<span class="kw-2">*</span>dst_addr, local_addr_ipv4, local_addr_ipv6) {
         (SocketAddr::V4(<span class="kw">_</span>), <span class="prelude-val">Some</span>(addr), <span class="kw">_</span>) =&gt; {
             socket.bind(<span class="kw-2">&amp;</span>SocketAddr::new(addr.clone().into(), <span class="number">0</span>).into())<span class="question-mark">?</span>;
         }
         (SocketAddr::V6(<span class="kw">_</span>), <span class="kw">_</span>, <span class="prelude-val">Some</span>(addr)) =&gt; {
             socket.bind(<span class="kw-2">&amp;</span>SocketAddr::new(addr.clone().into(), <span class="number">0</span>).into())<span class="question-mark">?</span>;
         }
         <span class="kw">_ </span>=&gt; {
             <span class="kw">if </span><span class="macro">cfg!</span>(windows) {
                 <span class="comment">// Windows requires a socket be bound before calling connect
                 </span><span class="kw">let </span>any: SocketAddr = <span class="kw">match </span><span class="kw-2">*</span>dst_addr {
                     SocketAddr::V4(<span class="kw">_</span>) =&gt; ([<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>).into(),
                     SocketAddr::V6(<span class="kw">_</span>) =&gt; ([<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>).into(),
                 };
                 socket.bind(<span class="kw-2">&amp;</span>any.into())<span class="question-mark">?</span>;
             }
         }
     }

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

 <span class="kw">fn </span>connect(
     addr: <span class="kw-2">&amp;</span>SocketAddr,
     config: <span class="kw-2">&amp;</span>Config,
     connect_timeout: <span class="prelude-ty">Option</span>&lt;Duration&gt;,
 ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="kw">impl </span>Future&lt;Output = <span class="prelude-ty">Result</span>&lt;TcpStream, ConnectError&gt;&gt;, ConnectError&gt; {
     <span class="comment">// TODO(eliza): if Tokio&#39;s `TcpSocket` gains support for setting the
     // keepalive timeout, it would be nice to use that instead of socket2,
     // and avoid the unsafe `into_raw_fd`/`from_raw_fd` dance...
     </span><span class="kw">use </span>socket2::{Domain, Protocol, Socket, TcpKeepalive, Type};
     <span class="kw">use </span>std::convert::TryInto;

     <span class="kw">let </span>domain = Domain::for_address(<span class="kw-2">*</span>addr);
     <span class="kw">let </span>socket = Socket::new(domain, Type::STREAM, <span class="prelude-val">Some</span>(Protocol::TCP))
         .map_err(ConnectError::m(<span class="string">&quot;tcp open error&quot;</span>))<span class="question-mark">?</span>;

     <span class="comment">// When constructing a Tokio `TcpSocket` from a raw fd/socket, the user is
     // responsible for ensuring O_NONBLOCK is set.
     </span>socket
         .set_nonblocking(<span class="bool-val">true</span>)
         .map_err(ConnectError::m(<span class="string">&quot;tcp set_nonblocking error&quot;</span>))<span class="question-mark">?</span>;

     <span class="kw">if let </span><span class="prelude-val">Some</span>(dur) = config.keep_alive_timeout {
         <span class="kw">let </span>conf = TcpKeepalive::new().with_time(dur);
         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = socket.set_tcp_keepalive(<span class="kw-2">&amp;</span>conf) {
             <span class="macro">warn!</span>(<span class="string">&quot;tcp set_keepalive error: {}&quot;</span>, e);
         }
     }

     bind_local_address(
         <span class="kw-2">&amp;</span>socket,
         addr,
         <span class="kw-2">&amp;</span>config.local_address_ipv4,
         <span class="kw-2">&amp;</span>config.local_address_ipv6,
     )
     .map_err(ConnectError::m(<span class="string">&quot;tcp bind local error&quot;</span>))<span class="question-mark">?</span>;

     <span class="attribute">#[cfg(unix)]
     </span><span class="kw">let </span>socket = <span class="kw">unsafe </span>{
         <span class="comment">// Safety: `from_raw_fd` is only safe to call if ownership of the raw
         // file descriptor is transferred. Since we call `into_raw_fd` on the
         // socket2 socket, it gives up ownership of the fd and will not close
         // it, so this is safe.
         </span><span class="kw">use </span>std::os::unix::io::{FromRawFd, IntoRawFd};
         TcpSocket::from_raw_fd(socket.into_raw_fd())
     };
     <span class="attribute">#[cfg(windows)]
     </span><span class="kw">let </span>socket = <span class="kw">unsafe </span>{
         <span class="comment">// Safety: `from_raw_socket` is only safe to call if ownership of the raw
         // Windows SOCKET is transferred. Since we call `into_raw_socket` on the
         // socket2 socket, it gives up ownership of the SOCKET and will not close
         // it, so this is safe.
         </span><span class="kw">use </span>std::os::windows::io::{FromRawSocket, IntoRawSocket};
         TcpSocket::from_raw_socket(socket.into_raw_socket())
     };

     <span class="kw">if </span>config.reuse_address {
         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = socket.set_reuseaddr(<span class="bool-val">true</span>) {
             <span class="macro">warn!</span>(<span class="string">&quot;tcp set_reuse_address error: {}&quot;</span>, e);
         }
     }

     <span class="kw">if let </span><span class="prelude-val">Some</span>(size) = config.send_buffer_size {
         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = socket.set_send_buffer_size(size.try_into().unwrap_or(std::u32::MAX)) {
             <span class="macro">warn!</span>(<span class="string">&quot;tcp set_buffer_size error: {}&quot;</span>, e);
         }
     }

     <span class="kw">if let </span><span class="prelude-val">Some</span>(size) = config.recv_buffer_size {
         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = socket.set_recv_buffer_size(size.try_into().unwrap_or(std::u32::MAX)) {
             <span class="macro">warn!</span>(<span class="string">&quot;tcp set_recv_buffer_size error: {}&quot;</span>, e);
         }
     }

     <span class="kw">let </span>connect = socket.connect(<span class="kw-2">*</span>addr);
     <span class="prelude-val">Ok</span>(<span class="kw">async move </span>{
         <span class="kw">match </span>connect_timeout {
             <span class="prelude-val">Some</span>(dur) =&gt; <span class="kw">match </span>tokio::time::timeout(dur, connect).<span class="kw">await </span>{
                 <span class="prelude-val">Ok</span>(<span class="prelude-val">Ok</span>(s)) =&gt; <span class="prelude-val">Ok</span>(s),
                 <span class="prelude-val">Ok</span>(<span class="prelude-val">Err</span>(e)) =&gt; <span class="prelude-val">Err</span>(e),
                 <span class="prelude-val">Err</span>(e) =&gt; <span class="prelude-val">Err</span>(io::Error::new(io::ErrorKind::TimedOut, e)),
             },
             <span class="prelude-val">None </span>=&gt; connect.<span class="kw">await</span>,
         }
         .map_err(ConnectError::m(<span class="string">&quot;tcp connect error&quot;</span>))
     })
 }

 <span class="kw">impl </span>ConnectingTcp&lt;<span class="lifetime">&#39;_</span>&gt; {
     <span class="kw">async fn </span>connect(<span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;TcpStream, ConnectError&gt; {
         <span class="kw">match </span><span class="self">self</span>.fallback {
             <span class="prelude-val">None </span>=&gt; <span class="self">self</span>.preferred.connect(<span class="self">self</span>.config).<span class="kw">await</span>,
             <span class="prelude-val">Some</span>(<span class="kw-2">mut </span>fallback) =&gt; {
                 <span class="kw">let </span>preferred_fut = <span class="self">self</span>.preferred.connect(<span class="self">self</span>.config);
                 <span class="macro">futures_util::pin_mut!</span>(preferred_fut);

                 <span class="kw">let </span>fallback_fut = fallback.remote.connect(<span class="self">self</span>.config);
                 <span class="macro">futures_util::pin_mut!</span>(fallback_fut);

                 <span class="kw">let </span>fallback_delay = fallback.delay;
                 <span class="macro">futures_util::pin_mut!</span>(fallback_delay);

                 <span class="kw">let </span>(result, future) =
                     <span class="kw">match </span>futures_util::future::select(preferred_fut, fallback_delay).<span class="kw">await </span>{
                         Either::Left((result, _fallback_delay)) =&gt; {
                             (result, Either::Right(fallback_fut))
                         }
                         Either::Right(((), preferred_fut)) =&gt; {
                             <span class="comment">// Delay is done, start polling both the preferred and the fallback
                             </span>futures_util::future::select(preferred_fut, fallback_fut)
                                 .<span class="kw">await
                                 </span>.factor_first()
                         }
                     };

                 <span class="kw">if </span>result.is_err() {
                     <span class="comment">// Fallback to the remaining future (could be preferred or fallback)
                     // if we get an error
                     </span>future.<span class="kw">await
                 </span>} <span class="kw">else </span>{
                     result
                 }
             }
         }
     }
 }

 <span class="attribute">#[cfg(test)]
 </span><span class="kw">mod </span>tests {
     <span class="kw">use </span>std::io;

     <span class="kw">use </span>::http::Uri;

     <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::sealed::{Connect, ConnectSvc};
     <span class="kw">use super</span>::{Config, ConnectError, HttpConnector};

     <span class="kw">async fn </span>connect&lt;C&gt;(
         connector: C,
         dst: Uri,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;&lt;C::_Svc <span class="kw">as </span>ConnectSvc&gt;::Connection, &lt;C::_Svc <span class="kw">as </span>ConnectSvc&gt;::Error&gt;
     <span class="kw">where
         </span>C: Connect,
     {
         connector.connect(<span class="kw">super</span>::<span class="kw">super</span>::sealed::Internal, dst).<span class="kw">await
     </span>}

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>test_errors_enforce_http() {
         <span class="kw">let </span>dst = <span class="string">&quot;https://example.domain/foo/bar?baz&quot;</span>.parse().unwrap();
         <span class="kw">let </span>connector = HttpConnector::new();

         <span class="kw">let </span>err = connect(connector, dst).<span class="kw">await</span>.unwrap_err();
         <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;*</span>err.msg, <span class="kw">super</span>::INVALID_NOT_HTTP);
     }

     <span class="attribute">#[cfg(any(target_os = <span class="string">&quot;linux&quot;</span>, target_os = <span class="string">&quot;macos&quot;</span>))]
     </span><span class="kw">fn </span>get_local_ips() -&gt; (<span class="prelude-ty">Option</span>&lt;std::net::Ipv4Addr&gt;, <span class="prelude-ty">Option</span>&lt;std::net::Ipv6Addr&gt;) {
         <span class="kw">use </span>std::net::{IpAddr, TcpListener};

         <span class="kw">let </span><span class="kw-2">mut </span>ip_v4 = <span class="prelude-val">None</span>;
         <span class="kw">let </span><span class="kw-2">mut </span>ip_v6 = <span class="prelude-val">None</span>;

         <span class="kw">let </span>ips = pnet_datalink::interfaces()
             .into_iter()
             .flat_map(|i| i.ips.into_iter().map(|n| n.ip()));

         <span class="kw">for </span>ip <span class="kw">in </span>ips {
             <span class="kw">match </span>ip {
                 IpAddr::V4(ip) <span class="kw">if </span>TcpListener::bind((ip, <span class="number">0</span>)).is_ok() =&gt; ip_v4 = <span class="prelude-val">Some</span>(ip),
                 IpAddr::V6(ip) <span class="kw">if </span>TcpListener::bind((ip, <span class="number">0</span>)).is_ok() =&gt; ip_v6 = <span class="prelude-val">Some</span>(ip),
                 <span class="kw">_ </span>=&gt; (),
             }

             <span class="kw">if </span>ip_v4.is_some() &amp;&amp; ip_v6.is_some() {
                 <span class="kw">break</span>;
             }
         }

         (ip_v4, ip_v6)
     }

     <span class="attribute">#[tokio::test]
     </span><span class="kw">async fn </span>test_errors_missing_scheme() {
         <span class="kw">let </span>dst = <span class="string">&quot;example.domain&quot;</span>.parse().unwrap();
         <span class="kw">let </span><span class="kw-2">mut </span>connector = HttpConnector::new();
         connector.enforce_http(<span class="bool-val">false</span>);

         <span class="kw">let </span>err = connect(connector, dst).<span class="kw">await</span>.unwrap_err();
         <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;*</span>err.msg, <span class="kw">super</span>::INVALID_MISSING_SCHEME);
     }

     <span class="comment">// NOTE: pnet crate that we use in this test doesn&#39;t compile on Windows
     </span><span class="attribute">#[cfg(any(target_os = <span class="string">&quot;linux&quot;</span>, target_os = <span class="string">&quot;macos&quot;</span>))]
     #[tokio::test]
     </span><span class="kw">async fn </span>local_address() {
         <span class="kw">use </span>std::net::{IpAddr, TcpListener};
         <span class="kw">let _ </span>= pretty_env_logger::try_init();

         <span class="kw">let </span>(bind_ip_v4, bind_ip_v6) = get_local_ips();
         <span class="kw">let </span>server4 = TcpListener::bind(<span class="string">&quot;127.0.0.1:0&quot;</span>).unwrap();
         <span class="kw">let </span>port = server4.local_addr().unwrap().port();
         <span class="kw">let </span>server6 = TcpListener::bind(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;[::1]:{}&quot;</span>, port)).unwrap();

         <span class="kw">let </span>assert_client_ip = |dst: String, server: TcpListener, expected_ip: IpAddr| <span class="kw">async move </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>connector = HttpConnector::new();

             <span class="kw">match </span>(bind_ip_v4, bind_ip_v6) {
                 (<span class="prelude-val">Some</span>(v4), <span class="prelude-val">Some</span>(v6)) =&gt; connector.set_local_addresses(v4, v6),
                 (<span class="prelude-val">Some</span>(v4), <span class="prelude-val">None</span>) =&gt; connector.set_local_address(<span class="prelude-val">Some</span>(v4.into())),
                 (<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(v6)) =&gt; connector.set_local_address(<span class="prelude-val">Some</span>(v6.into())),
                 <span class="kw">_ </span>=&gt; <span class="macro">unreachable!</span>(),
             }

             connect(connector, dst.parse().unwrap()).<span class="kw">await</span>.unwrap();

             <span class="kw">let </span>(<span class="kw">_</span>, client_addr) = server.accept().unwrap();

             <span class="macro">assert_eq!</span>(client_addr.ip(), expected_ip);
         };

         <span class="kw">if let </span><span class="prelude-val">Some</span>(ip) = bind_ip_v4 {
             assert_client_ip(<span class="macro">format!</span>(<span class="string">&quot;http://127.0.0.1:{}&quot;</span>, port), server4, ip.into()).<span class="kw">await</span>;
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(ip) = bind_ip_v6 {
             assert_client_ip(<span class="macro">format!</span>(<span class="string">&quot;http://[::1]:{}&quot;</span>, port), server6, ip.into()).<span class="kw">await</span>;
         }
     }

     <span class="attribute">#[test]
     #[cfg_attr(not(feature = <span class="string">&quot;__internal_happy_eyeballs_tests&quot;</span>), ignore)]
     </span><span class="kw">fn </span>client_happy_eyeballs() {
         <span class="kw">use </span>std::net::{IpAddr, Ipv4Addr, Ipv6Addr, TcpListener};
         <span class="kw">use </span>std::time::{Duration, Instant};

         <span class="kw">use </span><span class="kw">super</span>::dns;
         <span class="kw">use </span><span class="kw">super</span>::ConnectingTcp;

         <span class="kw">let _ </span>= pretty_env_logger::try_init();
         <span class="kw">let </span>server4 = TcpListener::bind(<span class="string">&quot;127.0.0.1:0&quot;</span>).unwrap();
         <span class="kw">let </span>addr = server4.local_addr().unwrap();
         <span class="kw">let </span>_server6 = TcpListener::bind(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">&quot;[::1]:{}&quot;</span>, addr.port())).unwrap();
         <span class="kw">let </span>rt = tokio::runtime::Builder::new_current_thread()
             .enable_all()
             .build()
             .unwrap();

         <span class="kw">let </span>local_timeout = Duration::default();
         <span class="kw">let </span>unreachable_v4_timeout = measure_connect(unreachable_ipv4_addr()).<span class="number">1</span>;
         <span class="kw">let </span>unreachable_v6_timeout = measure_connect(unreachable_ipv6_addr()).<span class="number">1</span>;
         <span class="kw">let </span>fallback_timeout = std::cmp::max(unreachable_v4_timeout, unreachable_v6_timeout)
             + Duration::from_millis(<span class="number">250</span>);

         <span class="kw">let </span>scenarios = <span class="kw-2">&amp;</span>[
             <span class="comment">// Fast primary, without fallback.
             </span>(<span class="kw-2">&amp;</span>[local_ipv4_addr()][..], <span class="number">4</span>, local_timeout, <span class="bool-val">false</span>),
             (<span class="kw-2">&amp;</span>[local_ipv6_addr()][..], <span class="number">6</span>, local_timeout, <span class="bool-val">false</span>),
             <span class="comment">// Fast primary, with (unused) fallback.
             </span>(
                 <span class="kw-2">&amp;</span>[local_ipv4_addr(), local_ipv6_addr()][..],
                 <span class="number">4</span>,
                 local_timeout,
                 <span class="bool-val">false</span>,
             ),
             (
                 <span class="kw-2">&amp;</span>[local_ipv6_addr(), local_ipv4_addr()][..],
                 <span class="number">6</span>,
                 local_timeout,
                 <span class="bool-val">false</span>,
             ),
             <span class="comment">// Unreachable + fast primary, without fallback.
             </span>(
                 <span class="kw-2">&amp;</span>[unreachable_ipv4_addr(), local_ipv4_addr()][..],
                 <span class="number">4</span>,
                 unreachable_v4_timeout,
                 <span class="bool-val">false</span>,
             ),
             (
                 <span class="kw-2">&amp;</span>[unreachable_ipv6_addr(), local_ipv6_addr()][..],
                 <span class="number">6</span>,
                 unreachable_v6_timeout,
                 <span class="bool-val">false</span>,
             ),
             <span class="comment">// Unreachable + fast primary, with (unused) fallback.
             </span>(
                 <span class="kw-2">&amp;</span>[
                     unreachable_ipv4_addr(),
                     local_ipv4_addr(),
                     local_ipv6_addr(),
                 ][..],
                 <span class="number">4</span>,
                 unreachable_v4_timeout,
                 <span class="bool-val">false</span>,
             ),
             (
                 <span class="kw-2">&amp;</span>[
                     unreachable_ipv6_addr(),
                     local_ipv6_addr(),
                     local_ipv4_addr(),
                 ][..],
                 <span class="number">6</span>,
                 unreachable_v6_timeout,
                 <span class="bool-val">true</span>,
             ),
             <span class="comment">// Slow primary, with (used) fallback.
             </span>(
                 <span class="kw-2">&amp;</span>[slow_ipv4_addr(), local_ipv4_addr(), local_ipv6_addr()][..],
                 <span class="number">6</span>,
                 fallback_timeout,
                 <span class="bool-val">false</span>,
             ),
             (
                 <span class="kw-2">&amp;</span>[slow_ipv6_addr(), local_ipv6_addr(), local_ipv4_addr()][..],
                 <span class="number">4</span>,
                 fallback_timeout,
                 <span class="bool-val">true</span>,
             ),
             <span class="comment">// Slow primary, with (used) unreachable + fast fallback.
             </span>(
                 <span class="kw-2">&amp;</span>[slow_ipv4_addr(), unreachable_ipv6_addr(), local_ipv6_addr()][..],
                 <span class="number">6</span>,
                 fallback_timeout + unreachable_v6_timeout,
                 <span class="bool-val">false</span>,
             ),
             (
                 <span class="kw-2">&amp;</span>[slow_ipv6_addr(), unreachable_ipv4_addr(), local_ipv4_addr()][..],
                 <span class="number">4</span>,
                 fallback_timeout + unreachable_v4_timeout,
                 <span class="bool-val">true</span>,
             ),
         ];

         <span class="comment">// Scenarios for IPv6 -&gt; IPv4 fallback require that host can access IPv6 network.
         // Otherwise, connection to &quot;slow&quot; IPv6 address will error-out immediately.
         </span><span class="kw">let </span>ipv6_accessible = measure_connect(slow_ipv6_addr()).<span class="number">0</span>;

         <span class="kw">for </span><span class="kw-2">&amp;</span>(hosts, family, timeout, needs_ipv6_access) <span class="kw">in </span>scenarios {
             <span class="kw">if </span>needs_ipv6_access &amp;&amp; !ipv6_accessible {
                 <span class="kw">continue</span>;
             }

             <span class="kw">let </span>(start, stream) = rt
                 .block_on(<span class="kw">async move </span>{
                     <span class="kw">let </span>addrs = hosts
                         .iter()
                         .map(|host| (host.clone(), addr.port()).into())
                         .collect();
                     <span class="kw">let </span>cfg = Config {
                         local_address_ipv4: <span class="prelude-val">None</span>,
                         local_address_ipv6: <span class="prelude-val">None</span>,
                         connect_timeout: <span class="prelude-val">None</span>,
                         keep_alive_timeout: <span class="prelude-val">None</span>,
                         happy_eyeballs_timeout: <span class="prelude-val">Some</span>(fallback_timeout),
                         nodelay: <span class="bool-val">false</span>,
                         reuse_address: <span class="bool-val">false</span>,
                         enforce_http: <span class="bool-val">false</span>,
                         send_buffer_size: <span class="prelude-val">None</span>,
                         recv_buffer_size: <span class="prelude-val">None</span>,
                     };
                     <span class="kw">let </span>connecting_tcp = ConnectingTcp::new(dns::SocketAddrs::new(addrs), <span class="kw-2">&amp;</span>cfg);
                     <span class="kw">let </span>start = Instant::now();
                     <span class="prelude-val">Ok</span>::&lt;<span class="kw">_</span>, ConnectError&gt;((start, ConnectingTcp::connect(connecting_tcp).<span class="kw">await</span><span class="question-mark">?</span>))
                 })
                 .unwrap();
             <span class="kw">let </span>res = <span class="kw">if </span>stream.peer_addr().unwrap().is_ipv4() {
                 <span class="number">4
             </span>} <span class="kw">else </span>{
                 <span class="number">6
             </span>};
             <span class="kw">let </span>duration = start.elapsed();

             <span class="comment">// Allow actual duration to be +/- 150ms off.
             </span><span class="kw">let </span>min_duration = <span class="kw">if </span>timeout &gt;= Duration::from_millis(<span class="number">150</span>) {
                 timeout - Duration::from_millis(<span class="number">150</span>)
             } <span class="kw">else </span>{
                 Duration::default()
             };
             <span class="kw">let </span>max_duration = timeout + Duration::from_millis(<span class="number">150</span>);

             <span class="macro">assert_eq!</span>(res, family);
             <span class="macro">assert!</span>(duration &gt;= min_duration);
             <span class="macro">assert!</span>(duration &lt;= max_duration);
         }

         <span class="kw">fn </span>local_ipv4_addr() -&gt; IpAddr {
             Ipv4Addr::new(<span class="number">127</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">1</span>).into()
         }

         <span class="kw">fn </span>local_ipv6_addr() -&gt; IpAddr {
             Ipv6Addr::new(<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">1</span>).into()
         }

         <span class="kw">fn </span>unreachable_ipv4_addr() -&gt; IpAddr {
             Ipv4Addr::new(<span class="number">127</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">2</span>).into()
         }

         <span class="kw">fn </span>unreachable_ipv6_addr() -&gt; IpAddr {
             Ipv6Addr::new(<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">2</span>).into()
         }

         <span class="kw">fn </span>slow_ipv4_addr() -&gt; IpAddr {
             <span class="comment">// RFC 6890 reserved IPv4 address.
             </span>Ipv4Addr::new(<span class="number">198</span>, <span class="number">18</span>, <span class="number">0</span>, <span class="number">25</span>).into()
         }

         <span class="kw">fn </span>slow_ipv6_addr() -&gt; IpAddr {
             <span class="comment">// RFC 6890 reserved IPv6 address.
             </span>Ipv6Addr::new(<span class="number">2001</span>, <span class="number">2</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">254</span>).into()
         }

         <span class="kw">fn </span>measure_connect(addr: IpAddr) -&gt; (bool, Duration) {
             <span class="kw">let </span>start = Instant::now();
             <span class="kw">let </span>result =
                 std::net::TcpStream::connect_timeout(<span class="kw-2">&amp;</span>(addr, <span class="number">80</span>).into(), Duration::from_secs(<span class="number">1</span>));

             <span class="kw">let </span>reachable = result.is_ok() || result.unwrap_err().kind() == io::ErrorKind::TimedOut;
             <span class="kw">let </span>duration = start.elapsed();
             (reachable, duration)
         }
     }
 }
 </code></pre></div>
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