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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/h2-0.3.19/src/server.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>server.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="../../h2/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="../../h2/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">//! Server implementation of the HTTP/2 protocol.
 //!
 //! # Getting started
 //!
 //! Running an HTTP/2 server requires the caller to manage accepting the
 //! connections as well as getting the connections to a state that is ready to
 //! begin the HTTP/2 handshake. See [here](../index.html#handshake) for more
 //! details.
 //!
 //! This could be as basic as using Tokio&#39;s [`TcpListener`] to accept
 //! connections, but usually it means using either ALPN or HTTP/1.1 protocol
 //! upgrades.
 //!
 //! Once a connection is obtained, it is passed to [`handshake`],
 //! which will begin the [HTTP/2 handshake]. This returns a future that
 //! completes once the handshake process is performed and HTTP/2 streams may
 //! be received.
 //!
 //! [`handshake`] uses default configuration values. There are a number of
 //! settings that can be changed by using [`Builder`] instead.
 //!
 //! # Inbound streams
 //!
 //! The [`Connection`] instance is used to accept inbound HTTP/2 streams. It
 //! does this by implementing [`futures::Stream`]. When a new stream is
 //! received, a call to [`Connection::accept`] will return `(request, response)`.
 //! The `request` handle (of type [`http::Request&lt;RecvStream&gt;`]) contains the
 //! HTTP request head as well as provides a way to receive the inbound data
 //! stream and the trailers. The `response` handle (of type [`SendResponse`])
 //! allows responding to the request, stream the response payload, send
 //! trailers, and send push promises.
 //!
 //! The send ([`SendStream`]) and receive ([`RecvStream`]) halves of the stream
 //! can be operated independently.
 //!
 //! # Managing the connection
 //!
 //! The [`Connection`] instance is used to manage connection state. The caller
 //! is required to call either [`Connection::accept`] or
 //! [`Connection::poll_close`] in order to advance the connection state. Simply
 //! operating on [`SendStream`] or [`RecvStream`] will have no effect unless the
 //! connection state is advanced.
 //!
 //! It is not required to call **both** [`Connection::accept`] and
 //! [`Connection::poll_close`]. If the caller is ready to accept a new stream,
 //! then only [`Connection::accept`] should be called. When the caller **does
 //! not** want to accept a new stream, [`Connection::poll_close`] should be
 //! called.
 //!
 //! The [`Connection`] instance should only be dropped once
 //! [`Connection::poll_close`] returns `Ready`. Once [`Connection::accept`]
 //! returns `Ready(None)`, there will no longer be any more inbound streams. At
 //! this point, only [`Connection::poll_close`] should be called.
 //!
 //! # Shutting down the server
 //!
 //! Graceful shutdown of the server is [not yet
 //! implemented](https://github.com/hyperium/h2/issues/69).
 //!
 //! # Example
 //!
 //! A basic HTTP/2 server example that runs over TCP and assumes [prior
 //! knowledge], i.e. both the client and the server assume that the TCP socket
 //! will use the HTTP/2 protocol without prior negotiation.
 //!
 //! ```no_run
 //! use h2::server;
 //! use http::{Response, StatusCode};
 //! use tokio::net::TcpListener;
 //!
 //! #[tokio::main]
 //! pub async fn main() {
 //!     let mut listener = TcpListener::bind(&quot;127.0.0.1:5928&quot;).await.unwrap();
 //!
 //!     // Accept all incoming TCP connections.
 //!     loop {
 //!         if let Ok((socket, _peer_addr)) = listener.accept().await {
 //!             // Spawn a new task to process each connection.
 //!             tokio::spawn(async {
 //!                 // Start the HTTP/2 connection handshake
 //!                 let mut h2 = server::handshake(socket).await.unwrap();
 //!                 // Accept all inbound HTTP/2 streams sent over the
 //!                 // connection.
 //!                 while let Some(request) = h2.accept().await {
 //!                     let (request, mut respond) = request.unwrap();
 //!                     println!(&quot;Received request: {:?}&quot;, request);
 //!
 //!                     // Build a response with no body
 //!                     let response = Response::builder()
 //!                         .status(StatusCode::OK)
 //!                         .body(())
 //!                         .unwrap();
 //!
 //!                     // Send the response back to the client
 //!                     respond.send_response(response, true)
 //!                         .unwrap();
 //!                 }
 //!
 //!             });
 //!         }
 //!     }
 //! }
 //! ```
 //!
 //! [prior knowledge]: http://httpwg.org/specs/rfc7540.html#known-http
 //! [`handshake`]: fn.handshake.html
 //! [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader
 //! [`Builder`]: struct.Builder.html
 //! [`Connection`]: struct.Connection.html
 //! [`Connection::poll`]: struct.Connection.html#method.poll
 //! [`Connection::poll_close`]: struct.Connection.html#method.poll_close
 //! [`futures::Stream`]: https://docs.rs/futures/0.1/futures/stream/trait.Stream.html
 //! [`http::Request&lt;RecvStream&gt;`]: ../struct.RecvStream.html
 //! [`RecvStream`]: ../struct.RecvStream.html
 //! [`SendStream`]: ../struct.SendStream.html
 //! [`TcpListener`]: https://docs.rs/tokio-core/0.1/tokio_core/net/struct.TcpListener.html

 </span><span class="kw">use </span><span class="kw">crate</span>::codec::{Codec, UserError};
 <span class="kw">use </span><span class="kw">crate</span>::frame::{<span class="self">self</span>, Pseudo, PushPromiseHeaderError, Reason, Settings, StreamId};
 <span class="kw">use </span><span class="kw">crate</span>::proto::{<span class="self">self</span>, Config, Error, Prioritized};
 <span class="kw">use crate</span>::{FlowControl, PingPong, RecvStream, SendStream};

 <span class="kw">use </span>bytes::{Buf, Bytes};
 <span class="kw">use </span>http::{HeaderMap, Method, Request, Response};
 <span class="kw">use </span>std::future::Future;
 <span class="kw">use </span>std::pin::Pin;
 <span class="kw">use </span>std::task::{Context, Poll};
 <span class="kw">use </span>std::time::Duration;
 <span class="kw">use </span>std::{fmt, io};
 <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
 <span class="kw">use </span>tracing::instrument::{Instrument, Instrumented};

 <span class="doccomment">/// In progress HTTP/2 connection handshake future.
 ///
 /// This type implements `Future`, yielding a `Connection` instance once the
 /// handshake has completed.
 ///
 /// The handshake is completed once the connection preface is fully received
 /// from the client **and** the initial settings frame is sent to the client.
 ///
 /// The handshake future does not wait for the initial settings frame from the
 /// client.
 ///
 /// See [module] level docs for more details.
 ///
 /// [module]: index.html
 </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>Handshake&lt;T, B: Buf = Bytes&gt; {
     <span class="doccomment">/// The config to pass to Connection::new after handshake succeeds.
     </span>builder: Builder,
     <span class="doccomment">/// The current state of the handshake.
     </span>state: Handshaking&lt;T, B&gt;,
     <span class="doccomment">/// Span tracking the handshake
     </span>span: tracing::Span,
 }

 <span class="doccomment">/// Accepts inbound HTTP/2 streams on a connection.
 ///
 /// A `Connection` is backed by an I/O resource (usually a TCP socket) and
 /// implements the HTTP/2 server logic for that connection. It is responsible
 /// for receiving inbound streams initiated by the client as well as driving the
 /// internal state forward.
 ///
 /// `Connection` values are created by calling [`handshake`]. Once a
 /// `Connection` value is obtained, the caller must call [`poll`] or
 /// [`poll_close`] in order to drive the internal connection state forward.
 ///
 /// See [module level] documentation for more details
 ///
 /// [module level]: index.html
 /// [`handshake`]: struct.Connection.html#method.handshake
 /// [`poll`]: struct.Connection.html#method.poll
 /// [`poll_close`]: struct.Connection.html#method.poll_close
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::server;
 /// # use h2::server::*;
 /// #
 /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T) {
 /// let mut server = server::handshake(my_io).await.unwrap();
 /// while let Some(request) = server.accept().await {
 ///     tokio::spawn(async move {
 ///         let (request, respond) = request.unwrap();
 ///         // Process the request and send the response back to the client
 ///         // using `respond`.
 ///     });
 /// }
 /// # }
 /// #
 /// # pub fn main() {}
 /// ```
 </span><span class="attribute">#[must_use = <span class="string">&quot;streams do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>Connection&lt;T, B: Buf&gt; {
     connection: proto::Connection&lt;T, Peer, B&gt;,
 }

 <span class="doccomment">/// Builds server connections with custom configuration values.
 ///
 /// Methods can be chained in order to set the configuration values.
 ///
 /// The server is constructed by calling [`handshake`] and passing the I/O
 /// handle that will back the HTTP/2 server.
 ///
 /// New instances of `Builder` are obtained via [`Builder::new`].
 ///
 /// See function level documentation for details on the various server
 /// configuration settings.
 ///
 /// [`Builder::new`]: struct.Builder.html#method.new
 /// [`handshake`]: struct.Builder.html#method.handshake
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::server::*;
 /// #
 /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
 /// # -&gt; Handshake&lt;T&gt;
 /// # {
 /// // `server_fut` is a future representing the completion of the HTTP/2
 /// // handshake.
 /// let server_fut = Builder::new()
 ///     .initial_window_size(1_000_000)
 ///     .max_concurrent_streams(1000)
 ///     .handshake(my_io);
 /// # server_fut
 /// # }
 /// #
 /// # pub fn main() {}
 /// ```
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>Builder {
     <span class="doccomment">/// Time to keep locally reset streams around before reaping.
     </span>reset_stream_duration: Duration,

     <span class="doccomment">/// Maximum number of locally reset streams to keep at a time.
     </span>reset_stream_max: usize,

     <span class="doccomment">/// Maximum number of remotely reset streams to allow in the pending
     /// accept queue.
     </span>pending_accept_reset_stream_max: usize,

     <span class="doccomment">/// Initial `Settings` frame to send as part of the handshake.
     </span>settings: Settings,

     <span class="doccomment">/// Initial target window size for new connections.
     </span>initial_target_connection_window_size: <span class="prelude-ty">Option</span>&lt;u32&gt;,

     <span class="doccomment">/// Maximum amount of bytes to &quot;buffer&quot; for writing per stream.
     </span>max_send_buffer_size: usize,
 }

 <span class="doccomment">/// Send a response back to the client
 ///
 /// A `SendResponse` instance is provided when receiving a request and is used
 /// to send the associated response back to the client. It is also used to
 /// explicitly reset the stream with a custom reason.
 ///
 /// It will also be used to initiate push promises linked with the associated
 /// stream.
 ///
 /// If the `SendResponse` instance is dropped without sending a response, then
 /// the HTTP/2 stream will be reset.
 ///
 /// See [module] level docs for more details.
 ///
 /// [module]: index.html
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>SendResponse&lt;B: Buf&gt; {
     inner: proto::StreamRef&lt;B&gt;,
 }

 <span class="doccomment">/// Send a response to a promised request
 ///
 /// A `SendPushedResponse` instance is provided when promising a request and is used
 /// to send the associated response to the client. It is also used to
 /// explicitly reset the stream with a custom reason.
 ///
 /// It can not be used to initiate push promises.
 ///
 /// If the `SendPushedResponse` instance is dropped without sending a response, then
 /// the HTTP/2 stream will be reset.
 ///
 /// See [module] level docs for more details.
 ///
 /// [module]: index.html
 </span><span class="kw">pub struct </span>SendPushedResponse&lt;B: Buf&gt; {
     inner: SendResponse&lt;B&gt;,
 }

 <span class="comment">// Manual implementation necessary because of rust-lang/rust#26925
 </span><span class="kw">impl</span>&lt;B: Buf + fmt::Debug&gt; fmt::Debug <span class="kw">for </span>SendPushedResponse&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) -&gt; fmt::Result {
         <span class="macro">write!</span>(f, <span class="string">&quot;SendPushedResponse {{ {:?} }}&quot;</span>, <span class="self">self</span>.inner)
     }
 }

 <span class="doccomment">/// Stages of an in-progress handshake.
 </span><span class="kw">enum </span>Handshaking&lt;T, B: Buf&gt; {
     <span class="doccomment">/// State 1. Connection is flushing pending SETTINGS frame.
     </span>Flushing(Instrumented&lt;Flush&lt;T, Prioritized&lt;B&gt;&gt;&gt;),
     <span class="doccomment">/// State 2. Connection is waiting for the client preface.
     </span>ReadingPreface(Instrumented&lt;ReadPreface&lt;T, Prioritized&lt;B&gt;&gt;&gt;),
     <span class="doccomment">/// State 3. Handshake is done, polling again would panic.
     </span>Done,
 }

 <span class="doccomment">/// Flush a Sink
 </span><span class="kw">struct </span>Flush&lt;T, B&gt; {
     codec: <span class="prelude-ty">Option</span>&lt;Codec&lt;T, B&gt;&gt;,
 }

 <span class="doccomment">/// Read the client connection preface
 </span><span class="kw">struct </span>ReadPreface&lt;T, B&gt; {
     codec: <span class="prelude-ty">Option</span>&lt;Codec&lt;T, B&gt;&gt;,
     pos: usize,
 }

 <span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Peer;

 <span class="kw">const </span>PREFACE: [u8; <span class="number">24</span>] = <span class="kw-2">*</span><span class="string">b&quot;PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n&quot;</span>;

 <span class="doccomment">/// Creates a new configured HTTP/2 server with default configuration
 /// values backed by `io`.
 ///
 /// It is expected that `io` already be in an appropriate state to commence
 /// the [HTTP/2 handshake]. See [Handshake] for more details.
 ///
 /// Returns a future which resolves to the [`Connection`] instance once the
 /// HTTP/2 handshake has been completed. The returned [`Connection`]
 /// instance will be using default configuration values. Use [`Builder`] to
 /// customize the configuration values used by a [`Connection`] instance.
 ///
 /// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader
 /// [Handshake]: ../index.html#handshake
 /// [`Connection`]: struct.Connection.html
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::server;
 /// # use h2::server::*;
 /// #
 /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
 /// # {
 /// let connection = server::handshake(my_io).await.unwrap();
 /// // The HTTP/2 handshake has completed, now use `connection` to
 /// // accept inbound HTTP/2 streams.
 /// # }
 /// #
 /// # pub fn main() {}
 /// ```
 </span><span class="kw">pub fn </span>handshake&lt;T&gt;(io: T) -&gt; Handshake&lt;T, Bytes&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
 {
     Builder::new().handshake(io)
 }

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

 </span><span class="kw">impl</span>&lt;T, B&gt; Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">fn </span>handshake2(io: T, builder: Builder) -&gt; Handshake&lt;T, B&gt; {
         <span class="kw">let </span>span = <span class="macro">tracing::trace_span!</span>(<span class="string">&quot;server_handshake&quot;</span>);
         <span class="kw">let </span>entered = span.enter();

         <span class="comment">// Create the codec.
         </span><span class="kw">let </span><span class="kw-2">mut </span>codec = Codec::new(io);

         <span class="kw">if let </span><span class="prelude-val">Some</span>(max) = builder.settings.max_frame_size() {
             codec.set_max_recv_frame_size(max <span class="kw">as </span>usize);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(max) = builder.settings.max_header_list_size() {
             codec.set_max_recv_header_list_size(max <span class="kw">as </span>usize);
         }

         <span class="comment">// Send initial settings frame.
         </span>codec
             .buffer(builder.settings.clone().into())
             .expect(<span class="string">&quot;invalid SETTINGS frame&quot;</span>);

         <span class="comment">// Create the handshake future.
         </span><span class="kw">let </span>state =
             Handshaking::Flushing(Flush::new(codec).instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">&quot;flush&quot;</span>)));

         drop(entered);

         Handshake {
             builder,
             state,
             span,
         }
     }

     <span class="doccomment">/// Accept the next incoming request on this connection.
     </span><span class="kw">pub async fn </span>accept(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;(Request&lt;RecvStream&gt;, SendResponse&lt;B&gt;), <span class="kw">crate</span>::Error&gt;&gt; {
         futures_util::future::poll_fn(<span class="kw">move </span>|cx| <span class="self">self</span>.poll_accept(cx)).<span class="kw">await
     </span>}

     <span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub fn </span>poll_accept(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;,
     ) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Result</span>&lt;(Request&lt;RecvStream&gt;, SendResponse&lt;B&gt;), <span class="kw">crate</span>::Error&gt;&gt;&gt; {
         <span class="comment">// Always try to advance the internal state. Getting Pending also is
         // needed to allow this function to return Pending.
         </span><span class="kw">if </span><span class="self">self</span>.poll_closed(cx)<span class="question-mark">?</span>.is_ready() {
             <span class="comment">// If the socket is closed, don&#39;t return anything
             // TODO: drop any pending streams
             </span><span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(inner) = <span class="self">self</span>.connection.next_incoming() {
             <span class="macro">tracing::trace!</span>(<span class="string">&quot;received incoming&quot;</span>);
             <span class="kw">let </span>(head, <span class="kw">_</span>) = inner.take_request().into_parts();
             <span class="kw">let </span>body = RecvStream::new(FlowControl::new(inner.clone_to_opaque()));

             <span class="kw">let </span>request = Request::from_parts(head, body);
             <span class="kw">let </span>respond = SendResponse { inner };

             <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>((request, respond))));
         }

         Poll::Pending
     }

     <span class="doccomment">/// Sets the target window size for the whole connection.
     ///
     /// If `size` is greater than the current value, then a `WINDOW_UPDATE`
     /// frame will be immediately sent to the remote, increasing the connection
     /// level window by `size - current_value`.
     ///
     /// If `size` is less than the current value, nothing will happen
     /// immediately. However, as window capacity is released by
     /// [`FlowControl`] instances, no `WINDOW_UPDATE` frames will be sent
     /// out until the number of &quot;in flight&quot; bytes drops below `size`.
     ///
     /// The default value is 65,535.
     ///
     /// See [`FlowControl`] documentation for more details.
     ///
     /// [`FlowControl`]: ../struct.FlowControl.html
     /// [library level]: ../index.html#flow-control
     </span><span class="kw">pub fn </span>set_target_window_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u32) {
         <span class="macro">assert!</span>(size &lt;= proto::MAX_WINDOW_SIZE);
         <span class="self">self</span>.connection.set_target_window_size(size);
     }

     <span class="doccomment">/// Set a new `INITIAL_WINDOW_SIZE` setting (in octets) for stream-level
     /// flow control for received data.
     ///
     /// The `SETTINGS` will be sent to the remote, and only applied once the
     /// remote acknowledges the change.
     ///
     /// This can be used to increase or decrease the window size for existing
     /// streams.
     ///
     /// # Errors
     ///
     /// Returns an error if a previous call is still pending acknowledgement
     /// from the remote endpoint.
     </span><span class="kw">pub fn </span>set_initial_window_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u32) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt; {
         <span class="macro">assert!</span>(size &lt;= proto::MAX_WINDOW_SIZE);
         <span class="self">self</span>.connection.set_initial_window_size(size)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Enables the [extended CONNECT protocol].
     ///
     /// [extended CONNECT protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
     ///
     /// # Errors
     ///
     /// Returns an error if a previous call is still pending acknowledgement
     /// from the remote endpoint.
     </span><span class="kw">pub fn </span>enable_connect_protocol(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt; {
         <span class="self">self</span>.connection.set_enable_connect_protocol()<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <span class="doccomment">/// Returns `Ready` when the underlying connection has closed.
     ///
     /// If any new inbound streams are received during a call to `poll_closed`,
     /// they will be queued and returned on the next call to [`poll_accept`].
     ///
     /// This function will advance the internal connection state, driving
     /// progress on all the other handles (e.g. [`RecvStream`] and [`SendStream`]).
     ///
     /// See [here](index.html#managing-the-connection) for more details.
     ///
     /// [`poll_accept`]: struct.Connection.html#method.poll_accept
     /// [`RecvStream`]: ../struct.RecvStream.html
     /// [`SendStream`]: ../struct.SendStream.html
     </span><span class="kw">pub fn </span>poll_closed(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt;&gt; {
         <span class="self">self</span>.connection.poll(cx).map_err(Into::into)
     }

     <span class="attribute">#[doc(hidden)]
     #[deprecated(note = <span class="string">&quot;renamed to poll_closed&quot;</span>)]
     </span><span class="kw">pub fn </span>poll_close(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt;&gt; {
         <span class="self">self</span>.poll_closed(cx)
     }

     <span class="doccomment">/// Sets the connection to a GOAWAY state.
     ///
     /// Does not terminate the connection. Must continue being polled to close
     /// connection.
     ///
     /// After flushing the GOAWAY frame, the connection is closed. Any
     /// outstanding streams do not prevent the connection from closing. This
     /// should usually be reserved for shutting down when something bad
     /// external to `h2` has happened, and open streams cannot be properly
     /// handled.
     ///
     /// For graceful shutdowns, see [`graceful_shutdown`](Connection::graceful_shutdown).
     </span><span class="kw">pub fn </span>abrupt_shutdown(<span class="kw-2">&amp;mut </span><span class="self">self</span>, reason: Reason) {
         <span class="self">self</span>.connection.go_away_from_user(reason);
     }

     <span class="doccomment">/// Starts a [graceful shutdown][1] process.
     ///
     /// Must continue being polled to close connection.
     ///
     /// It&#39;s possible to receive more requests after calling this method, since
     /// they might have been in-flight from the client already. After about
     /// 1 RTT, no new requests should be accepted. Once all active streams
     /// have completed, the connection is closed.
     ///
     /// [1]: http://httpwg.org/specs/rfc7540.html#GOAWAY
     </span><span class="kw">pub fn </span>graceful_shutdown(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
         <span class="self">self</span>.connection.go_away_gracefully();
     }

     <span class="doccomment">/// Takes a `PingPong` instance from the connection.
     ///
     /// # Note
     ///
     /// This may only be called once. Calling multiple times will return `None`.
     </span><span class="kw">pub fn </span>ping_pong(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;PingPong&gt; {
         <span class="self">self</span>.connection.take_user_pings().map(PingPong::new)
     }

     <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated
     /// by the server on this connection.
     ///
     /// This limit is configured by the client peer by sending the
     /// [`SETTINGS_MAX_CONCURRENT_STREAMS` parameter][1] in a `SETTINGS` frame.
     /// This method returns the currently acknowledged value received from the
     /// remote.
     ///
     /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2
     </span><span class="kw">pub fn </span>max_concurrent_send_streams(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.connection.max_send_streams()
     }

     <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated
     /// by the client on this connection.
     ///
     /// This returns the value of the [`SETTINGS_MAX_CONCURRENT_STREAMS`
     /// parameter][1] sent in a `SETTINGS` frame that has been
     /// acknowledged by the remote peer. The value to be sent is configured by
     /// the [`Builder::max_concurrent_streams`][2] method before handshaking
     /// with the remote peer.
     ///
     /// [1]: https://tools.ietf.org/html/rfc7540#section-5.1.2
     /// [2]: ../struct.Builder.html#method.max_concurrent_streams
     </span><span class="kw">pub fn </span>max_concurrent_recv_streams(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.connection.max_recv_streams()
     }

     <span class="comment">// Could disappear at anytime.
     </span><span class="attribute">#[doc(hidden)]
     #[cfg(feature = <span class="string">&quot;unstable&quot;</span>)]
     </span><span class="kw">pub fn </span>num_wired_streams(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.connection.num_wired_streams()
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;stream&quot;</span>)]
 </span><span class="kw">impl</span>&lt;T, B&gt; futures_core::Stream <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">type </span>Item = <span class="prelude-ty">Result</span>&lt;(Request&lt;RecvStream&gt;, SendResponse&lt;B&gt;), <span class="kw">crate</span>::Error&gt;;

     <span class="kw">fn </span>poll_next(<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>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt;&gt; {
         <span class="self">self</span>.poll_accept(cx)
     }
 }

 <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: fmt::Debug,
     B: fmt::Debug + Buf,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         fmt.debug_struct(<span class="string">&quot;Connection&quot;</span>)
             .field(<span class="string">&quot;connection&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.connection)
             .finish()
     }
 }

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

 </span><span class="kw">impl </span>Builder {
     <span class="doccomment">/// Returns a new server builder instance initialized with default
     /// configuration values.
     ///
     /// Configuration methods can be chained on the return value.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .initial_window_size(1_000_000)
     ///     .max_concurrent_streams(1000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>new() -&gt; Builder {
         Builder {
             reset_stream_duration: Duration::from_secs(proto::DEFAULT_RESET_STREAM_SECS),
             reset_stream_max: proto::DEFAULT_RESET_STREAM_MAX,
             pending_accept_reset_stream_max: proto::DEFAULT_REMOTE_RESET_STREAM_MAX,
             settings: Settings::default(),
             initial_target_connection_window_size: <span class="prelude-val">None</span>,
             max_send_buffer_size: proto::DEFAULT_MAX_SEND_BUFFER_SIZE,
         }
     }

     <span class="doccomment">/// Indicates the initial window size (in octets) for stream-level
     /// flow control for received data.
     ///
     /// The initial window of a stream is used as part of flow control. For more
     /// details, see [`FlowControl`].
     ///
     /// The default value is 65,535.
     ///
     /// [`FlowControl`]: ../struct.FlowControl.html
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .initial_window_size(1_000_000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>initial_window_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_initial_window_size(<span class="prelude-val">Some</span>(size));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Indicates the initial window size (in octets) for connection-level flow control
     /// for received data.
     ///
     /// The initial window of a connection is used as part of flow control. For more details,
     /// see [`FlowControl`].
     ///
     /// The default value is 65,535.
     ///
     /// [`FlowControl`]: ../struct.FlowControl.html
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .initial_connection_window_size(1_000_000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>initial_connection_window_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, size: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.initial_target_connection_window_size = <span class="prelude-val">Some</span>(size);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Indicates the size (in octets) of the largest HTTP/2 frame payload that the
     /// configured server is able to accept.
     ///
     /// The sender may send data frames that are **smaller** than this value,
     /// but any data larger than `max` will be broken up into multiple `DATA`
     /// frames.
     ///
     /// The value **must** be between 16,384 and 16,777,215. The default value is 16,384.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .max_frame_size(1_000_000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     ///
     /// # Panics
     ///
     /// This function panics if `max` is not within the legal range specified
     /// above.
     </span><span class="kw">pub fn </span>max_frame_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_max_frame_size(<span class="prelude-val">Some</span>(max));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the max size of received header frames.
     ///
     /// This advisory setting informs a peer of the maximum size of header list
     /// that the sender is prepared to accept, in octets. The value is based on
     /// the uncompressed size of header fields, including the length of the name
     /// and value in octets plus an overhead of 32 octets for each header field.
     ///
     /// This setting is also used to limit the maximum amount of data that is
     /// buffered to decode HEADERS frames.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .max_header_list_size(16 * 1024)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>max_header_list_size(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_max_header_list_size(<span class="prelude-val">Some</span>(max));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of concurrent streams.
     ///
     /// The maximum concurrent streams setting only controls the maximum number
     /// of streams that can be initiated by the remote peer. In other words,
     /// when this setting is set to 100, this does not limit the number of
     /// concurrent streams that can be created by the caller.
     ///
     /// It is recommended that this value be no smaller than 100, so as to not
     /// unnecessarily limit parallelism. However, any value is legal, including
     /// 0. If `max` is set to 0, then the remote will not be permitted to
     /// initiate streams.
     ///
     /// Note that streams in the reserved state, i.e., push promises that have
     /// been reserved but the stream has not started, do not count against this
     /// setting.
     ///
     /// Also note that if the remote *does* exceed the value set here, it is not
     /// a protocol level error. Instead, the `h2` library will immediately reset
     /// the stream.
     ///
     /// See [Section 5.1.2] in the HTTP/2 spec for more details.
     ///
     /// [Section 5.1.2]: https://http2.github.io/http2-spec/#rfc.section.5.1.2
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .max_concurrent_streams(1000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>max_concurrent_streams(<span class="kw-2">&amp;mut </span><span class="self">self</span>, max: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_max_concurrent_streams(<span class="prelude-val">Some</span>(max));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of concurrent locally reset streams.
     ///
     /// When a stream is explicitly reset by either calling
     /// [`SendResponse::send_reset`] or by dropping a [`SendResponse`] instance
     /// before completing the stream, the HTTP/2 specification requires that
     /// any further frames received for that stream must be ignored for &quot;some
     /// time&quot;.
     ///
     /// In order to satisfy the specification, internal state must be maintained
     /// to implement the behavior. This state grows linearly with the number of
     /// streams that are locally reset.
     ///
     /// The `max_concurrent_reset_streams` setting configures sets an upper
     /// bound on the amount of state that is maintained. When this max value is
     /// reached, the oldest reset stream is purged from memory.
     ///
     /// Once the stream has been fully purged from memory, any additional frames
     /// received for that stream will result in a connection level protocol
     /// error, forcing the connection to terminate.
     ///
     /// The default value is 10.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .max_concurrent_reset_streams(1000)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>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>.reset_stream_max = max;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of pending-accept remotely-reset streams.
     ///
     /// Streams that have been received by the peer, but not accepted by the
     /// user, can also receive a RST_STREAM. This is a legitimate pattern: one
     /// could send a request and then shortly after, realize it is not needed,
     /// sending a CANCEL.
     ///
     /// However, since those streams are now &quot;closed&quot;, they don&#39;t count towards
     /// the max concurrent streams. So, they will sit in the accept queue,
     /// using memory.
     ///
     /// When the number of remotely-reset streams sitting in the pending-accept
     /// queue reaches this maximum value, a connection error with the code of
     /// `ENHANCE_YOUR_CALM` will be sent to the peer, and returned by the
     /// `Future`.
     ///
     /// The default value is currently 20, but could change.
     ///
     /// # Examples
     ///
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .max_pending_accept_reset_streams(100)
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>max_pending_accept_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>.pending_accept_reset_stream_max = max;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum send buffer size per stream.
     ///
     /// Once a stream has buffered up to (or over) the maximum, the stream&#39;s
     /// flow control will not &quot;poll&quot; additional capacity. Once bytes for the
     /// stream have been written to the connection, the send buffer capacity
     /// will be freed up again.
     ///
     /// The default is currently ~400MB, but may change.
     ///
     /// # Panics
     ///
     /// This function panics if `max` is larger than `u32::MAX`.
     </span><span class="kw">pub fn </span>max_send_buffer_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>.max_send_buffer_size = max;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of concurrent locally reset streams.
     ///
     /// When a stream is explicitly reset by either calling
     /// [`SendResponse::send_reset`] or by dropping a [`SendResponse`] instance
     /// before completing the stream, the HTTP/2 specification requires that
     /// any further frames received for that stream must be ignored for &quot;some
     /// time&quot;.
     ///
     /// In order to satisfy the specification, internal state must be maintained
     /// to implement the behavior. This state grows linearly with the number of
     /// streams that are locally reset.
     ///
     /// The `reset_stream_duration` setting configures the max amount of time
     /// this state will be maintained in memory. Once the duration elapses, the
     /// stream state is purged from memory.
     ///
     /// Once the stream has been fully purged from memory, any additional frames
     /// received for that stream will result in a connection level protocol
     /// error, forcing the connection to terminate.
     ///
     /// The default value is 30 seconds.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// # use std::time::Duration;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .reset_stream_duration(Duration::from_secs(10))
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>reset_stream_duration(<span class="kw-2">&amp;mut </span><span class="self">self</span>, dur: Duration) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.reset_stream_duration = dur;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Enables the [extended CONNECT protocol].
     ///
     /// [extended CONNECT protocol]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
     </span><span class="kw">pub fn </span>enable_connect_protocol(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_enable_connect_protocol(<span class="prelude-val">Some</span>(<span class="number">1</span>));
         <span class="self">self
     </span>}

     <span class="doccomment">/// Creates a new configured HTTP/2 server backed by `io`.
     ///
     /// It is expected that `io` already be in an appropriate state to commence
     /// the [HTTP/2 handshake]. See [Handshake] for more details.
     ///
     /// Returns a future which resolves to the [`Connection`] instance once the
     /// HTTP/2 handshake has been completed.
     ///
     /// This function also allows the caller to configure the send payload data
     /// type. See [Outbound data type] for more details.
     ///
     /// [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader
     /// [Handshake]: ../index.html#handshake
     /// [`Connection`]: struct.Connection.html
     /// [Outbound data type]: ../index.html#outbound-data-type.
     ///
     /// # Examples
     ///
     /// Basic usage:
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut = Builder::new()
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     ///
     /// Configures the send-payload data type. In this case, the outbound data
     /// type will be `&amp;&#39;static [u8]`.
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::server::*;
     /// #
     /// # fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Handshake&lt;T, &amp;&#39;static [u8]&gt;
     /// # {
     /// // `server_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let server_fut: Handshake&lt;_, &amp;&#39;static [u8]&gt; = Builder::new()
     ///     .handshake(my_io);
     /// # server_fut
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </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; Handshake&lt;T, B&gt;
     <span class="kw">where
         </span>T: AsyncRead + AsyncWrite + Unpin,
         B: Buf,
     {
         Connection::handshake2(io, <span class="self">self</span>.clone())
     }
 }

 <span class="kw">impl </span>Default <span class="kw">for </span>Builder {
     <span class="kw">fn </span>default() -&gt; Builder {
         Builder::new()
     }
 }

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

 </span><span class="kw">impl</span>&lt;B: Buf&gt; SendResponse&lt;B&gt; {
     <span class="doccomment">/// Send a response to a client request.
     ///
     /// On success, a [`SendStream`] instance is returned. This instance can be
     /// used to stream the response body and send trailers.
     ///
     /// If a body or trailers will be sent on the returned [`SendStream`]
     /// instance, then `end_of_stream` must be set to `false` when calling this
     /// function.
     ///
     /// The [`SendResponse`] instance is already associated with a received
     /// request.  This function may only be called once per instance and only if
     /// [`send_reset`] has not been previously called.
     ///
     /// [`SendResponse`]: #
     /// [`SendStream`]: ../struct.SendStream.html
     /// [`send_reset`]: #method.send_reset
     </span><span class="kw">pub fn </span>send_response(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         response: Response&lt;()&gt;,
         end_of_stream: bool,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;SendStream&lt;B&gt;, <span class="kw">crate</span>::Error&gt; {
         <span class="self">self</span>.inner
             .send_response(response, end_of_stream)
             .map(|<span class="kw">_</span>| SendStream::new(<span class="self">self</span>.inner.clone()))
             .map_err(Into::into)
     }

     <span class="doccomment">/// Push a request and response to the client
     ///
     /// On success, a [`SendResponse`] instance is returned.
     ///
     /// [`SendResponse`]: #
     </span><span class="kw">pub fn </span>push_request(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;()&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;SendPushedResponse&lt;B&gt;, <span class="kw">crate</span>::Error&gt; {
         <span class="self">self</span>.inner
             .send_push_promise(request)
             .map(|inner| SendPushedResponse {
                 inner: SendResponse { inner },
             })
             .map_err(Into::into)
     }

     <span class="doccomment">/// Send a stream reset to the peer.
     ///
     /// This essentially cancels the stream, including any inbound or outbound
     /// data streams.
     ///
     /// If this function is called before [`send_response`], a call to
     /// [`send_response`] will result in an error.
     ///
     /// If this function is called while a [`SendStream`] instance is active,
     /// any further use of the instance will result in an error.
     ///
     /// This function should only be called once.
     ///
     /// [`send_response`]: #method.send_response
     /// [`SendStream`]: ../struct.SendStream.html
     </span><span class="kw">pub fn </span>send_reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, reason: Reason) {
         <span class="self">self</span>.inner.send_reset(reason)
     }

     <span class="doccomment">/// Polls to be notified when the client resets this stream.
     ///
     /// If stream is still open, this returns `Poll::Pending`, and
     /// registers the task to be notified if a `RST_STREAM` is received.
     ///
     /// If a `RST_STREAM` frame is received for this stream, calling this
     /// method will yield the `Reason` for the reset.
     ///
     /// # Error
     ///
     /// Calling this method after having called `send_response` will return
     /// a user error.
     </span><span class="kw">pub fn </span>poll_reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;Reason, <span class="kw">crate</span>::Error&gt;&gt; {
         <span class="self">self</span>.inner.poll_reset(cx, proto::PollReset::AwaitingHeaders)
     }

     <span class="doccomment">/// Returns the stream ID of the response stream.
     ///
     /// # Panics
     ///
     /// If the lock on the stream store has been poisoned.
     </span><span class="kw">pub fn </span>stream_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">crate</span>::StreamId {
         <span class="kw">crate</span>::StreamId::from_internal(<span class="self">self</span>.inner.stream_id())
     }
 }

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

 </span><span class="kw">impl</span>&lt;B: Buf&gt; SendPushedResponse&lt;B&gt; {
     <span class="doccomment">/// Send a response to a promised request.
     ///
     /// On success, a [`SendStream`] instance is returned. This instance can be
     /// used to stream the response body and send trailers.
     ///
     /// If a body or trailers will be sent on the returned [`SendStream`]
     /// instance, then `end_of_stream` must be set to `false` when calling this
     /// function.
     ///
     /// The [`SendPushedResponse`] instance is associated with a promised
     /// request.  This function may only be called once per instance and only if
     /// [`send_reset`] has not been previously called.
     ///
     /// [`SendPushedResponse`]: #
     /// [`SendStream`]: ../struct.SendStream.html
     /// [`send_reset`]: #method.send_reset
     </span><span class="kw">pub fn </span>send_response(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         response: Response&lt;()&gt;,
         end_of_stream: bool,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;SendStream&lt;B&gt;, <span class="kw">crate</span>::Error&gt; {
         <span class="self">self</span>.inner.send_response(response, end_of_stream)
     }

     <span class="doccomment">/// Send a stream reset to the peer.
     ///
     /// This essentially cancels the stream, including any inbound or outbound
     /// data streams.
     ///
     /// If this function is called before [`send_response`], a call to
     /// [`send_response`] will result in an error.
     ///
     /// If this function is called while a [`SendStream`] instance is active,
     /// any further use of the instance will result in an error.
     ///
     /// This function should only be called once.
     ///
     /// [`send_response`]: #method.send_response
     /// [`SendStream`]: ../struct.SendStream.html
     </span><span class="kw">pub fn </span>send_reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, reason: Reason) {
         <span class="self">self</span>.inner.send_reset(reason)
     }

     <span class="doccomment">/// Polls to be notified when the client resets this stream.
     ///
     /// If stream is still open, this returns `Poll::Pending`, and
     /// registers the task to be notified if a `RST_STREAM` is received.
     ///
     /// If a `RST_STREAM` frame is received for this stream, calling this
     /// method will yield the `Reason` for the reset.
     ///
     /// # Error
     ///
     /// Calling this method after having called `send_response` will return
     /// a user error.
     </span><span class="kw">pub fn </span>poll_reset(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;Reason, <span class="kw">crate</span>::Error&gt;&gt; {
         <span class="self">self</span>.inner.poll_reset(cx)
     }

     <span class="doccomment">/// Returns the stream ID of the response stream.
     ///
     /// # Panics
     ///
     /// If the lock on the stream store has been poisoned.
     </span><span class="kw">pub fn </span>stream_id(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw">crate</span>::StreamId {
         <span class="self">self</span>.inner.stream_id()
     }
 }

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

 </span><span class="kw">impl</span>&lt;T, B: Buf&gt; Flush&lt;T, B&gt; {
     <span class="kw">fn </span>new(codec: Codec&lt;T, B&gt;) -&gt; <span class="self">Self </span>{
         Flush { codec: <span class="prelude-val">Some</span>(codec) }
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; Future <span class="kw">for </span>Flush&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;Codec&lt;T, B&gt;, <span class="kw">crate</span>::Error&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>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="comment">// Flush the codec
         </span><span class="macro">ready!</span>(<span class="self">self</span>.codec.as_mut().unwrap().flush(cx)).map_err(<span class="kw">crate</span>::Error::from_io)<span class="question-mark">?</span>;

         <span class="comment">// Return the codec
         </span>Poll::Ready(<span class="prelude-val">Ok</span>(<span class="self">self</span>.codec.take().unwrap()))
     }
 }

 <span class="kw">impl</span>&lt;T, B: Buf&gt; ReadPreface&lt;T, B&gt; {
     <span class="kw">fn </span>new(codec: Codec&lt;T, B&gt;) -&gt; <span class="self">Self </span>{
         ReadPreface {
             codec: <span class="prelude-val">Some</span>(codec),
             pos: <span class="number">0</span>,
         }
     }

     <span class="kw">fn </span>inner_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>T {
         <span class="self">self</span>.codec.as_mut().unwrap().get_mut()
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; Future <span class="kw">for </span>ReadPreface&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + Unpin,
     B: Buf,
 {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;Codec&lt;T, B&gt;, <span class="kw">crate</span>::Error&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>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">24</span>];
         <span class="kw">let </span><span class="kw-2">mut </span>rem = PREFACE.len() - <span class="self">self</span>.pos;

         <span class="kw">while </span>rem &gt; <span class="number">0 </span>{
             <span class="kw">let </span><span class="kw-2">mut </span>buf = ReadBuf::new(<span class="kw-2">&amp;mut </span>buf[..rem]);
             <span class="macro">ready!</span>(Pin::new(<span class="self">self</span>.inner_mut()).poll_read(cx, <span class="kw-2">&amp;mut </span>buf))
                 .map_err(<span class="kw">crate</span>::Error::from_io)<span class="question-mark">?</span>;
             <span class="kw">let </span>n = buf.filled().len();
             <span class="kw">if </span>n == <span class="number">0 </span>{
                 <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(<span class="kw">crate</span>::Error::from_io(io::Error::new(
                     io::ErrorKind::UnexpectedEof,
                     <span class="string">&quot;connection closed before reading preface&quot;</span>,
                 ))));
             }

             <span class="kw">if </span><span class="kw-2">&amp;</span>PREFACE[<span class="self">self</span>.pos..<span class="self">self</span>.pos + n] != buf.filled() {
                 <span class="macro">proto_err!</span>(conn: <span class="string">&quot;read_preface: invalid preface&quot;</span>);
                 <span class="comment">// TODO: Should this just write the GO_AWAY frame directly?
                 </span><span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(Error::library_go_away(Reason::PROTOCOL_ERROR).into()));
             }

             <span class="self">self</span>.pos += n;
             rem -= n; <span class="comment">// TODO test
         </span>}

         Poll::Ready(<span class="prelude-val">Ok</span>(<span class="self">self</span>.codec.take().unwrap()))
     }
 }

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

 </span><span class="kw">impl</span>&lt;T, B: Buf&gt; Future <span class="kw">for </span>Handshake&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;Connection&lt;T, B&gt;, <span class="kw">crate</span>::Error&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>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="self">Self</span>::Output&gt; {
         <span class="kw">let </span>span = <span class="self">self</span>.span.clone(); <span class="comment">// XXX(eliza): T_T
         </span><span class="kw">let </span>_e = span.enter();
         <span class="macro">tracing::trace!</span>(state = <span class="question-mark">?</span><span class="self">self</span>.state);

         <span class="kw">loop </span>{
             <span class="kw">match </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.state {
                 Handshaking::Flushing(flush) =&gt; {
                     <span class="comment">// We&#39;re currently flushing a pending SETTINGS frame. Poll the
                     // flush future, and, if it&#39;s completed, advance our state to wait
                     // for the client preface.
                     </span><span class="kw">let </span>codec = <span class="kw">match </span>Pin::new(flush).poll(cx)<span class="question-mark">? </span>{
                         Poll::Pending =&gt; {
                             <span class="macro">tracing::trace!</span>(flush.poll = %<span class="string">&quot;Pending&quot;</span>);
                             <span class="kw">return </span>Poll::Pending;
                         }
                         Poll::Ready(flushed) =&gt; {
                             <span class="macro">tracing::trace!</span>(flush.poll = %<span class="string">&quot;Ready&quot;</span>);
                             flushed
                         }
                     };
                     <span class="self">self</span>.state = Handshaking::ReadingPreface(
                         ReadPreface::new(codec).instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">&quot;read_preface&quot;</span>)),
                     );
                 }
                 Handshaking::ReadingPreface(read) =&gt; {
                     <span class="kw">let </span>codec = <span class="macro">ready!</span>(Pin::new(read).poll(cx)<span class="question-mark">?</span>);

                     <span class="self">self</span>.state = Handshaking::Done;

                     <span class="kw">let </span>connection = proto::Connection::new(
                         codec,
                         Config {
                             next_stream_id: <span class="number">2</span>.into(),
                             <span class="comment">// Server does not need to locally initiate any streams
                             </span>initial_max_send_streams: <span class="number">0</span>,
                             max_send_buffer_size: <span class="self">self</span>.builder.max_send_buffer_size,
                             reset_stream_duration: <span class="self">self</span>.builder.reset_stream_duration,
                             reset_stream_max: <span class="self">self</span>.builder.reset_stream_max,
                             remote_reset_stream_max: <span class="self">self</span>.builder.pending_accept_reset_stream_max,
                             settings: <span class="self">self</span>.builder.settings.clone(),
                         },
                     );

                     <span class="macro">tracing::trace!</span>(<span class="string">&quot;connection established!&quot;</span>);
                     <span class="kw">let </span><span class="kw-2">mut </span>c = Connection { connection };
                     <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = <span class="self">self</span>.builder.initial_target_connection_window_size {
                         c.set_target_window_size(sz);
                     }

                     <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Ok</span>(c));
                 }
                 Handshaking::Done =&gt; {
                     <span class="macro">panic!</span>(<span class="string">&quot;Handshaking::poll() called again after handshaking was complete&quot;</span>)
                 }
             }
         }
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; fmt::Debug <span class="kw">for </span>Handshake&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + fmt::Debug,
     B: fmt::Debug + Buf,
 {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, fmt: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="macro">write!</span>(fmt, <span class="string">&quot;server::Handshake&quot;</span>)
     }
 }

 <span class="kw">impl </span>Peer {
     <span class="kw">pub fn </span>convert_send_message(
         id: StreamId,
         response: Response&lt;()&gt;,
         end_of_stream: bool,
     ) -&gt; frame::Headers {
         <span class="kw">use </span>http::response::Parts;

         <span class="comment">// Extract the components of the HTTP request
         </span><span class="kw">let </span>(
             Parts {
                 status, headers, ..
             },
             <span class="kw">_</span>,
         ) = response.into_parts();

         <span class="comment">// Build the set pseudo header set. All requests will include `method`
         // and `path`.
         </span><span class="kw">let </span>pseudo = Pseudo::response(status);

         <span class="comment">// Create the HEADERS frame
         </span><span class="kw">let </span><span class="kw-2">mut </span>frame = frame::Headers::new(id, pseudo, headers);

         <span class="kw">if </span>end_of_stream {
             frame.set_end_stream()
         }

         frame
     }

     <span class="kw">pub fn </span>convert_push_message(
         stream_id: StreamId,
         promised_id: StreamId,
         request: Request&lt;()&gt;,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;frame::PushPromise, UserError&gt; {
         <span class="kw">use </span>http::request::Parts;

         <span class="kw">if let </span><span class="prelude-val">Err</span>(e) = frame::PushPromise::validate_request(<span class="kw-2">&amp;</span>request) {
             <span class="kw">use </span>PushPromiseHeaderError::<span class="kw-2">*</span>;
             <span class="kw">match </span>e {
                 NotSafeAndCacheable =&gt; <span class="macro">tracing::debug!</span>(
                     <span class="question-mark">?</span>promised_id,
                     <span class="string">&quot;convert_push_message: method {} is not safe and cacheable&quot;</span>,
                     request.method(),
                 ),
                 InvalidContentLength(e) =&gt; <span class="macro">tracing::debug!</span>(
                     <span class="question-mark">?</span>promised_id,
                     <span class="string">&quot;convert_push_message; promised request has invalid content-length {:?}&quot;</span>,
                     e,
                 ),
             }
             <span class="kw">return </span><span class="prelude-val">Err</span>(UserError::MalformedHeaders);
         }

         <span class="comment">// Extract the components of the HTTP request
         </span><span class="kw">let </span>(
             Parts {
                 method,
                 uri,
                 headers,
                 ..
             },
             <span class="kw">_</span>,
         ) = request.into_parts();

         <span class="kw">let </span>pseudo = Pseudo::request(method, uri, <span class="prelude-val">None</span>);

         <span class="prelude-val">Ok</span>(frame::PushPromise::new(
             stream_id,
             promised_id,
             pseudo,
             headers,
         ))
     }
 }

 <span class="kw">impl </span>proto::Peer <span class="kw">for </span>Peer {
     <span class="kw">type </span>Poll = Request&lt;()&gt;;

     <span class="kw">const </span>NAME: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str = <span class="string">&quot;Server&quot;</span>;

     <span class="kw">fn </span>is_server() -&gt; bool {
         <span class="bool-val">true
     </span>}

     <span class="kw">fn </span>r#dyn() -&gt; proto::DynPeer {
         proto::DynPeer::Server
     }

     <span class="kw">fn </span>convert_poll_message(
         pseudo: Pseudo,
         fields: HeaderMap,
         stream_id: StreamId,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Poll, Error&gt; {
         <span class="kw">use </span>http::{uri, Version};

         <span class="kw">let </span><span class="kw-2">mut </span>b = Request::builder();

         <span class="macro">macro_rules! </span>malformed {
             ($(<span class="macro-nonterminal">$arg</span>:tt)<span class="kw-2">*</span>) =&gt; {{
                 <span class="macro">tracing::debug!</span>($(<span class="macro-nonterminal">$arg</span>)<span class="kw-2">*</span>);
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR));
             }}
         }

         b = b.version(Version::HTTP_2);

         <span class="kw">let </span>is_connect;
         <span class="kw">if let </span><span class="prelude-val">Some</span>(method) = pseudo.method {
             is_connect = method == Method::CONNECT;
             b = b.method(method);
         } <span class="kw">else </span>{
             <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: missing method&quot;</span>);
         }

         <span class="kw">let </span>has_protocol = pseudo.protocol.is_some();
         <span class="kw">if </span>has_protocol {
             <span class="kw">if </span>is_connect {
                 <span class="comment">// Assert that we have the right type.
                 </span>b = b.extension::&lt;<span class="kw">crate</span>::ext::Protocol&gt;(pseudo.protocol.unwrap());
             } <span class="kw">else </span>{
                 <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: :protocol on non-CONNECT request&quot;</span>);
             }
         }

         <span class="kw">if </span>pseudo.status.is_some() {
             <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: :status field on request&quot;</span>);
         }

         <span class="comment">// Convert the URI
         </span><span class="kw">let </span><span class="kw-2">mut </span>parts = uri::Parts::default();

         <span class="comment">// A request translated from HTTP/1 must not include the :authority
         // header
         </span><span class="kw">if let </span><span class="prelude-val">Some</span>(authority) = pseudo.authority {
             <span class="kw">let </span>maybe_authority = uri::Authority::from_maybe_shared(authority.clone().into_inner());
             parts.authority = <span class="prelude-val">Some</span>(maybe_authority.or_else(|why| {
                 <span class="macro">malformed!</span>(
                     <span class="string">&quot;malformed headers: malformed authority ({:?}): {}&quot;</span>,
                     authority,
                     why,
                 )
             })<span class="question-mark">?</span>);
         }

         <span class="comment">// A :scheme is required, except CONNECT.
         </span><span class="kw">if let </span><span class="prelude-val">Some</span>(scheme) = pseudo.scheme {
             <span class="kw">if </span>is_connect &amp;&amp; !has_protocol {
                 <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: :scheme in CONNECT&quot;</span>);
             }
             <span class="kw">let </span>maybe_scheme = scheme.parse();
             <span class="kw">let </span>scheme = maybe_scheme.or_else(|why| {
                 <span class="macro">malformed!</span>(
                     <span class="string">&quot;malformed headers: malformed scheme ({:?}): {}&quot;</span>,
                     scheme,
                     why,
                 )
             })<span class="question-mark">?</span>;

             <span class="comment">// It&#39;s not possible to build an `Uri` from a scheme and path. So,
             // after validating is was a valid scheme, we just have to drop it
             // if there isn&#39;t an :authority.
             </span><span class="kw">if </span>parts.authority.is_some() {
                 parts.scheme = <span class="prelude-val">Some</span>(scheme);
             }
         } <span class="kw">else if </span>!is_connect || has_protocol {
             <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: missing scheme&quot;</span>);
         }

         <span class="kw">if let </span><span class="prelude-val">Some</span>(path) = pseudo.path {
             <span class="kw">if </span>is_connect &amp;&amp; !has_protocol {
                 <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: :path in CONNECT&quot;</span>);
             }

             <span class="comment">// This cannot be empty
             </span><span class="kw">if </span>path.is_empty() {
                 <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: missing path&quot;</span>);
             }

             <span class="kw">let </span>maybe_path = uri::PathAndQuery::from_maybe_shared(path.clone().into_inner());
             parts.path_and_query = <span class="prelude-val">Some</span>(maybe_path.or_else(|why| {
                 <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: malformed path ({:?}): {}&quot;</span>, path, why,)
             })<span class="question-mark">?</span>);
         } <span class="kw">else if </span>is_connect &amp;&amp; has_protocol {
             <span class="macro">malformed!</span>(<span class="string">&quot;malformed headers: missing path in extended CONNECT&quot;</span>);
         }

         b = b.uri(parts);

         <span class="kw">let </span><span class="kw-2">mut </span>request = <span class="kw">match </span>b.body(()) {
             <span class="prelude-val">Ok</span>(request) =&gt; request,
             <span class="prelude-val">Err</span>(e) =&gt; {
                 <span class="comment">// TODO: Should there be more specialized handling for different
                 // kinds of errors
                 </span><span class="macro">proto_err!</span>(stream: <span class="string">&quot;error building request: {}; stream={:?}&quot;</span>, e, stream_id);
                 <span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR));
             }
         };

         <span class="kw-2">*</span>request.headers_mut() = fields;

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

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

 </span><span class="kw">impl</span>&lt;T, B&gt; fmt::Debug <span class="kw">for </span>Handshaking&lt;T, B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="attribute">#[inline]
     </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) -&gt; <span class="prelude-ty">Result</span>&lt;(), fmt::Error&gt; {
         <span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
             Handshaking::Flushing(<span class="kw">_</span>) =&gt; f.write_str(<span class="string">&quot;Flushing(_)&quot;</span>),
             Handshaking::ReadingPreface(<span class="kw">_</span>) =&gt; f.write_str(<span class="string">&quot;ReadingPreface(_)&quot;</span>),
             Handshaking::Done =&gt; f.write_str(<span class="string">&quot;Done&quot;</span>),
         }
     }
 }
 </code></pre></div>
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