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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/client.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>client.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">//! Client implementation of the HTTP/2 protocol.
 //!
 //! # Getting started
 //!
 //! Running an HTTP/2 client requires the caller to establish the underlying
 //! connection as well as get the connection 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 [`TcpStream`] to connect to a remote
 //! host, 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 initialized.
 //!
 //! [`handshake`] uses default configuration values. There are a number of
 //! settings that can be changed by using [`Builder`] instead.
 //!
 //! Once the handshake future completes, the caller is provided with a
 //! [`Connection`] instance and a [`SendRequest`] instance. The [`Connection`]
 //! instance is used to drive the connection (see [Managing the connection]).
 //! The [`SendRequest`] instance is used to initialize new streams (see [Making
 //! requests]).
 //!
 //! # Making requests
 //!
 //! Requests are made using the [`SendRequest`] handle provided by the handshake
 //! future. Once a request is submitted, an HTTP/2 stream is initialized and
 //! the request is sent to the server.
 //!
 //! A request body and request trailers are sent using [`SendRequest`] and the
 //! server&#39;s response is returned once the [`ResponseFuture`] future completes.
 //! Both the [`SendStream`] and [`ResponseFuture`] instances are returned by
 //! [`SendRequest::send_request`] and are tied to the HTTP/2 stream
 //! initialized by the sent request.
 //!
 //! The [`SendRequest::poll_ready`] function returns `Ready` when a new HTTP/2
 //! stream can be created, i.e. as long as the current number of active streams
 //! is below [`MAX_CONCURRENT_STREAMS`]. If a new stream cannot be created, the
 //! caller will be notified once an existing stream closes, freeing capacity for
 //! the caller.  The caller should use [`SendRequest::poll_ready`] to check for
 //! capacity before sending a request to the server.
 //!
 //! [`SendRequest`] enforces the [`MAX_CONCURRENT_STREAMS`] setting. The user
 //! must not send a request if `poll_ready` does not return `Ready`. Attempting
 //! to do so will result in an [`Error`] being returned.
 //!
 //! # Managing the connection
 //!
 //! The [`Connection`] instance is used to manage connection state. The caller
 //! is required to call [`Connection::poll`] in order to advance state.
 //! [`SendRequest::send_request`] and other functions have no effect unless
 //! [`Connection::poll`] is called.
 //!
 //! The [`Connection`] instance should only be dropped once [`Connection::poll`]
 //! returns `Ready`. At this point, the underlying socket has been closed and no
 //! further work needs to be done.
 //!
 //! The easiest way to ensure that the [`Connection`] instance gets polled is to
 //! submit the [`Connection`] instance to an [executor]. The executor will then
 //! manage polling the connection until the connection is complete.
 //! Alternatively, the caller can call `poll` manually.
 //!
 //! # Example
 //!
 //! ```rust, no_run
 //!
 //! use h2::client;
 //!
 //! use http::{Request, Method};
 //! use std::error::Error;
 //! use tokio::net::TcpStream;
 //!
 //! #[tokio::main]
 //! pub async fn main() -&gt; Result&lt;(), Box&lt;dyn Error&gt;&gt; {
 //!     // Establish TCP connection to the server.
 //!     let tcp = TcpStream::connect(&quot;127.0.0.1:5928&quot;).await?;
 //!     let (h2, connection) = client::handshake(tcp).await?;
 //!     tokio::spawn(async move {
 //!         connection.await.unwrap();
 //!     });
 //!
 //!     let mut h2 = h2.ready().await?;
 //!     // Prepare the HTTP request to send to the server.
 //!     let request = Request::builder()
 //!                     .method(Method::GET)
 //!                     .uri(&quot;https://www.example.com/&quot;)
 //!                     .body(())
 //!                     .unwrap();
 //!
 //!     // Send the request. The second tuple item allows the caller
 //!     // to stream a request body.
 //!     let (response, _) = h2.send_request(request, true).unwrap();
 //!
 //!     let (head, mut body) = response.await?.into_parts();
 //!
 //!     println!(&quot;Received response: {:?}&quot;, head);
 //!
 //!     // The `flow_control` handle allows the caller to manage
 //!     // flow control.
 //!     //
 //!     // Whenever data is received, the caller is responsible for
 //!     // releasing capacity back to the server once it has freed
 //!     // the data from memory.
 //!     let mut flow_control = body.flow_control().clone();
 //!
 //!     while let Some(chunk) = body.data().await {
 //!         let chunk = chunk?;
 //!         println!(&quot;RX: {:?}&quot;, chunk);
 //!
 //!         // Let the server send more data.
 //!         let _ = flow_control.release_capacity(chunk.len());
 //!     }
 //!
 //!     Ok(())
 //! }
 //! ```
 //!
 //! [`TcpStream`]: https://docs.rs/tokio-core/0.1/tokio_core/net/struct.TcpStream.html
 //! [`handshake`]: fn.handshake.html
 //! [executor]: https://docs.rs/futures/0.1/futures/future/trait.Executor.html
 //! [`SendRequest`]: struct.SendRequest.html
 //! [`SendStream`]: ../struct.SendStream.html
 //! [Making requests]: #making-requests
 //! [Managing the connection]: #managing-the-connection
 //! [`Connection`]: struct.Connection.html
 //! [`Connection::poll`]: struct.Connection.html#method.poll
 //! [`SendRequest::send_request`]: struct.SendRequest.html#method.send_request
 //! [`MAX_CONCURRENT_STREAMS`]: http://httpwg.org/specs/rfc7540.html#SettingValues
 //! [`SendRequest`]: struct.SendRequest.html
 //! [`ResponseFuture`]: struct.ResponseFuture.html
 //! [`SendRequest::poll_ready`]: struct.SendRequest.html#method.poll_ready
 //! [HTTP/2 handshake]: http://httpwg.org/specs/rfc7540.html#ConnectionHeader
 //! [`Builder`]: struct.Builder.html
 //! [`Error`]: ../struct.Error.html

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

 <span class="kw">use </span>bytes::{Buf, Bytes};
 <span class="kw">use </span>http::{uri, HeaderMap, Method, Request, Response, Version};
 <span class="kw">use </span>std::fmt;
 <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::usize;
 <span class="kw">use </span>tokio::io::{AsyncRead, AsyncWrite, AsyncWriteExt};
 <span class="kw">use </span>tracing::Instrument;

 <span class="doccomment">/// Initializes new HTTP/2 streams on a connection by sending a request.
 ///
 /// This type does no work itself. Instead, it is a handle to the inner
 /// connection state held by [`Connection`]. If the associated connection
 /// instance is dropped, all `SendRequest` functions will return [`Error`].
 ///
 /// [`SendRequest`] instances are able to move to and operate on separate tasks
 /// / threads than their associated [`Connection`] instance. Internally, there
 /// is a buffer used to stage requests before they get written to the
 /// connection. There is no guarantee that requests get written to the
 /// connection in FIFO order as HTTP/2 prioritization logic can play a role.
 ///
 /// [`SendRequest`] implements [`Clone`], enabling the creation of many
 /// instances that are backed by a single connection.
 ///
 /// See [module] level documentation for more details.
 ///
 /// [module]: index.html
 /// [`Connection`]: struct.Connection.html
 /// [`Clone`]: https://doc.rust-lang.org/std/clone/trait.Clone.html
 /// [`Error`]: ../struct.Error.html
 </span><span class="kw">pub struct </span>SendRequest&lt;B: Buf&gt; {
     inner: proto::Streams&lt;B, Peer&gt;,
     pending: <span class="prelude-ty">Option</span>&lt;proto::OpaqueStreamRef&gt;,
 }

 <span class="doccomment">/// Returns a `SendRequest` instance once it is ready to send at least one
 /// request.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>ReadySendRequest&lt;B: Buf&gt; {
     inner: <span class="prelude-ty">Option</span>&lt;SendRequest&lt;B&gt;&gt;,
 }

 <span class="doccomment">/// Manages all state associated with an HTTP/2 client connection.
 ///
 /// A `Connection` is backed by an I/O resource (usually a TCP socket) and
 /// implements the HTTP/2 client logic for that connection. It is responsible
 /// for driving the internal state forward, performing the work requested of the
 /// associated handles ([`SendRequest`], [`ResponseFuture`], [`SendStream`],
 /// [`RecvStream`]).
 ///
 /// `Connection` values are created by calling [`handshake`]. Once a
 /// `Connection` value is obtained, the caller must repeatedly call [`poll`]
 /// until `Ready` is returned. The easiest way to do this is to submit the
 /// `Connection` instance to an [executor].
 ///
 /// [module]: index.html
 /// [`handshake`]: fn.handshake.html
 /// [`SendRequest`]: struct.SendRequest.html
 /// [`ResponseFuture`]: struct.ResponseFuture.html
 /// [`SendStream`]: ../struct.SendStream.html
 /// [`RecvStream`]: ../struct.RecvStream.html
 /// [`poll`]: #method.poll
 /// [executor]: https://docs.rs/futures/0.1/futures/future/trait.Executor.html
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::client;
 /// # use h2::client::*;
 /// #
 /// # async fn doc&lt;T&gt;(my_io: T) -&gt; Result&lt;(), h2::Error&gt;
 /// # where T: AsyncRead + AsyncWrite + Send + Unpin + &#39;static,
 /// # {
 ///     let (send_request, connection) = client::handshake(my_io).await?;
 ///     // Submit the connection handle to an executor.
 ///     tokio::spawn(async { connection.await.expect(&quot;connection failed&quot;); });
 ///
 ///     // Now, use `send_request` to initialize HTTP/2 streams.
 ///     // ...
 /// # Ok(())
 /// # }
 /// #
 /// # pub fn main() {}
 /// ```
 </span><span class="attribute">#[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>Connection&lt;T, B: Buf = Bytes&gt; {
     inner: proto::Connection&lt;T, Peer, B&gt;,
 }

 <span class="doccomment">/// A future of an HTTP response.
 </span><span class="attribute">#[derive(Debug)]
 #[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>ResponseFuture {
     inner: proto::OpaqueStreamRef,
     push_promise_consumed: bool,
 }

 <span class="doccomment">/// A future of a pushed HTTP response.
 ///
 /// We have to differentiate between pushed and non pushed because of the spec
 /// &lt;https://httpwg.org/specs/rfc7540.html#PUSH_PROMISE&gt;
 /// &gt; PUSH_PROMISE frames MUST only be sent on a peer-initiated stream
 /// &gt; that is in either the &quot;open&quot; or &quot;half-closed (remote)&quot; state.
 </span><span class="attribute">#[derive(Debug)]
 #[must_use = <span class="string">&quot;futures do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>PushedResponseFuture {
     inner: ResponseFuture,
 }

 <span class="doccomment">/// A pushed response and corresponding request headers
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>PushPromise {
     <span class="doccomment">/// The request headers
     </span>request: Request&lt;()&gt;,

     <span class="doccomment">/// The pushed response
     </span>response: PushedResponseFuture,
 }

 <span class="doccomment">/// A stream of pushed responses and corresponding promised requests
 </span><span class="attribute">#[derive(Debug)]
 #[must_use = <span class="string">&quot;streams do nothing unless polled&quot;</span>]
 </span><span class="kw">pub struct </span>PushPromises {
     inner: proto::OpaqueStreamRef,
 }

 <span class="doccomment">/// Builds client connections with custom configuration values.
 ///
 /// Methods can be chained in order to set the configuration values.
 ///
 /// The client 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 client
 /// configuration settings.
 ///
 /// [`Builder::new`]: struct.Builder.html#method.new
 /// [`handshake`]: struct.Builder.html#method.handshake
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::client::*;
 /// # use bytes::Bytes;
 /// #
 /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
 ///     -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
 /// # {
 /// // `client_fut` is a future representing the completion of the HTTP/2
 /// // handshake.
 /// let client_fut = Builder::new()
 ///     .initial_window_size(1_000_000)
 ///     .max_concurrent_streams(1000)
 ///     .handshake(my_io);
 /// # client_fut.await
 /// # }
 /// #
 /// # 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">/// Initial maximum number of locally initiated (send) streams.
     /// After receiving a Settings frame from the remote peer,
     /// the connection will overwrite this value with the
     /// MAX_CONCURRENT_STREAMS specified in the frame.
     </span>initial_max_send_streams: usize,

     <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">/// 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">/// The stream ID of the first (lowest) stream. Subsequent streams will use
     /// monotonically increasing stream IDs.
     </span>stream_id: StreamId,
 }

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

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

 </span><span class="kw">impl</span>&lt;B&gt; SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="doccomment">/// Returns `Ready` when the connection can initialize a new HTTP/2
     /// stream.
     ///
     /// This function must return `Ready` before `send_request` is called. When
     /// `Poll::Pending` is returned, the task will be notified once the readiness
     /// state changes.
     ///
     /// See [module] level docs for more details.
     ///
     /// [module]: index.html
     </span><span class="kw">pub fn </span>poll_ready(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt;&gt; {
         <span class="macro">ready!</span>(<span class="self">self</span>.inner.poll_pending_open(cx, <span class="self">self</span>.pending.as_ref()))<span class="question-mark">?</span>;
         <span class="self">self</span>.pending = <span class="prelude-val">None</span>;
         Poll::Ready(<span class="prelude-val">Ok</span>(()))
     }

     <span class="doccomment">/// Consumes `self`, returning a future that returns `self` back once it is
     /// ready to send a request.
     ///
     /// This function should be called before calling `send_request`.
     ///
     /// This is a functional combinator for [`poll_ready`]. The returned future
     /// will call `SendStream::poll_ready` until `Ready`, then returns `self` to
     /// the caller.
     ///
     /// # Examples
     ///
     /// ```rust
     /// # use h2::client::*;
     /// # use http::*;
     /// # async fn doc(send_request: SendRequest&lt;&amp;&#39;static [u8]&gt;)
     /// # {
     /// // First, wait until the `send_request` handle is ready to send a new
     /// // request
     /// let mut send_request = send_request.ready().await.unwrap();
     /// // Use `send_request` here.
     /// # }
     /// # pub fn main() {}
     /// ```
     ///
     /// See [module] level docs for more details.
     ///
     /// [`poll_ready`]: #method.poll_ready
     /// [module]: index.html
     </span><span class="kw">pub fn </span>ready(<span class="self">self</span>) -&gt; ReadySendRequest&lt;B&gt; {
         ReadySendRequest { inner: <span class="prelude-val">Some</span>(<span class="self">self</span>) }
     }

     <span class="doccomment">/// Sends a HTTP/2 request to the server.
     ///
     /// `send_request` initializes a new HTTP/2 stream on the associated
     /// connection, then sends the given request using this new stream. Only the
     /// request head is sent.
     ///
     /// On success, a [`ResponseFuture`] instance and [`SendStream`] instance
     /// are returned. The [`ResponseFuture`] instance is used to get the
     /// server&#39;s response and the [`SendStream`] instance is used to send a
     /// request body or trailers to the server over the same HTTP/2 stream.
     ///
     /// To send a request body or trailers, set `end_of_stream` to `false`.
     /// Then, use the returned [`SendStream`] instance to stream request body
     /// chunks or send trailers. If `end_of_stream` is **not** set to `false`
     /// then attempting to call [`SendStream::send_data`] or
     /// [`SendStream::send_trailers`] will result in an error.
     ///
     /// If no request body or trailers are to be sent, set `end_of_stream` to
     /// `true` and drop the returned [`SendStream`] instance.
     ///
     /// # A note on HTTP versions
     ///
     /// The provided `Request` will be encoded differently depending on the
     /// value of its version field. If the version is set to 2.0, then the
     /// request is encoded as per the specification recommends.
     ///
     /// If the version is set to a lower value, then the request is encoded to
     /// preserve the characteristics of HTTP 1.1 and lower. Specifically, host
     /// headers are permitted and the `:authority` pseudo header is not
     /// included.
     ///
     /// The caller should always set the request&#39;s version field to 2.0 unless
     /// specifically transmitting an HTTP 1.1 request over 2.0.
     ///
     /// # Examples
     ///
     /// Sending a request with no body
     ///
     /// ```rust
     /// # use h2::client::*;
     /// # use http::*;
     /// # async fn doc(send_request: SendRequest&lt;&amp;&#39;static [u8]&gt;)
     /// # {
     /// // First, wait until the `send_request` handle is ready to send a new
     /// // request
     /// let mut send_request = send_request.ready().await.unwrap();
     /// // Prepare the HTTP request to send to the server.
     /// let request = Request::get(&quot;https://www.example.com/&quot;)
     ///     .body(())
     ///     .unwrap();
     ///
     /// // Send the request to the server. Since we are not sending a
     /// // body or trailers, we can drop the `SendStream` instance.
     /// let (response, _) = send_request.send_request(request, true).unwrap();
     /// let response = response.await.unwrap();
     /// // Process the response
     /// # }
     /// # pub fn main() {}
     /// ```
     ///
     /// Sending a request with a body and trailers
     ///
     /// ```rust
     /// # use h2::client::*;
     /// # use http::*;
     /// # async fn doc(send_request: SendRequest&lt;&amp;&#39;static [u8]&gt;)
     /// # {
     /// // First, wait until the `send_request` handle is ready to send a new
     /// // request
     /// let mut send_request = send_request.ready().await.unwrap();
     ///
     /// // Prepare the HTTP request to send to the server.
     /// let request = Request::get(&quot;https://www.example.com/&quot;)
     ///     .body(())
     ///     .unwrap();
     ///
     /// // Send the request to the server. If we are not sending a
     /// // body or trailers, we can drop the `SendStream` instance.
     /// let (response, mut send_stream) = send_request
     ///     .send_request(request, false).unwrap();
     ///
     /// // At this point, one option would be to wait for send capacity.
     /// // Doing so would allow us to not hold data in memory that
     /// // cannot be sent. However, this is not a requirement, so this
     /// // example will skip that step. See `SendStream` documentation
     /// // for more details.
     /// send_stream.send_data(b&quot;hello&quot;, false).unwrap();
     /// send_stream.send_data(b&quot;world&quot;, false).unwrap();
     ///
     /// // Send the trailers.
     /// let mut trailers = HeaderMap::new();
     /// trailers.insert(
     ///     header::HeaderName::from_bytes(b&quot;my-trailer&quot;).unwrap(),
     ///     header::HeaderValue::from_bytes(b&quot;hello&quot;).unwrap());
     ///
     /// send_stream.send_trailers(trailers).unwrap();
     ///
     /// let response = response.await.unwrap();
     /// // Process the response
     /// # }
     /// # pub fn main() {}
     /// ```
     ///
     /// [`ResponseFuture`]: struct.ResponseFuture.html
     /// [`SendStream`]: ../struct.SendStream.html
     /// [`SendStream::send_data`]: ../struct.SendStream.html#method.send_data
     /// [`SendStream::send_trailers`]: ../struct.SendStream.html#method.send_trailers
     </span><span class="kw">pub fn </span>send_request(
         <span class="kw-2">&amp;mut </span><span class="self">self</span>,
         request: Request&lt;()&gt;,
         end_of_stream: bool,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(ResponseFuture, SendStream&lt;B&gt;), <span class="kw">crate</span>::Error&gt; {
         <span class="self">self</span>.inner
             .send_request(request, end_of_stream, <span class="self">self</span>.pending.as_ref())
             .map_err(Into::into)
             .map(|stream| {
                 <span class="kw">if </span>stream.is_pending_open() {
                     <span class="self">self</span>.pending = <span class="prelude-val">Some</span>(stream.clone_to_opaque());
                 }

                 <span class="kw">let </span>response = ResponseFuture {
                     inner: stream.clone_to_opaque(),
                     push_promise_consumed: <span class="bool-val">false</span>,
                 };

                 <span class="kw">let </span>stream = SendStream::new(stream);

                 (response, stream)
             })
     }

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

 <span class="kw">impl</span>&lt;B&gt; fmt::Debug <span class="kw">for </span>SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: 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;SendRequest&quot;</span>).finish()
     }
 }

 <span class="kw">impl</span>&lt;B&gt; Clone <span class="kw">for </span>SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
         SendRequest {
             inner: <span class="self">self</span>.inner.clone(),
             pending: <span class="prelude-val">None</span>,
         }
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;unstable&quot;</span>)]
 </span><span class="kw">impl</span>&lt;B&gt; SendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="doccomment">/// Returns the number of active streams.
     ///
     /// An active stream is a stream that has not yet transitioned to a closed
     /// state.
     </span><span class="kw">pub fn </span>num_active_streams(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.inner.num_active_streams()
     }

     <span class="doccomment">/// Returns the number of streams that are held in memory.
     ///
     /// A wired stream is a stream that is either active or is closed but must
     /// stay in memory for some reason. For example, there are still outstanding
     /// userspace handles pointing to the slot.
     </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>.inner.num_wired_streams()
     }
 }

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

 </span><span class="kw">impl</span>&lt;B&gt; Future <span class="kw">for </span>ReadySendRequest&lt;B&gt;
 <span class="kw">where
     </span>B: Buf,
 {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;SendRequest&lt;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">match </span><span class="kw-2">&amp;mut </span><span class="self">self</span>.inner {
             <span class="prelude-val">Some</span>(send_request) =&gt; {
                 <span class="macro">ready!</span>(send_request.poll_ready(cx))<span class="question-mark">?</span>;
             }
             <span class="prelude-val">None </span>=&gt; <span class="macro">panic!</span>(<span class="string">&quot;called `poll` after future completed&quot;</span>),
         }

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

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

 </span><span class="kw">impl </span>Builder {
     <span class="doccomment">/// Returns a new client builder instance initialized with default
     /// configuration values.
     ///
     /// Configuration methods can be chained on the return value.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .initial_window_size(1_000_000)
     ///     .max_concurrent_streams(1000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>new() -&gt; Builder {
         Builder {
             max_send_buffer_size: proto::DEFAULT_MAX_SEND_BUFFER_SIZE,
             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,
             initial_target_connection_window_size: <span class="prelude-val">None</span>,
             initial_max_send_streams: usize::MAX,
             settings: Default::default(),
             stream_id: <span class="number">1</span>.into(),
         }
     }

     <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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .initial_window_size(1_000_000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .initial_connection_window_size(1_000_000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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 client 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .max_frame_size(1_000_000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .max_header_list_size(16 * 1024)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .max_concurrent_streams(1000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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 initial maximum of locally initiated (send) streams.
     ///
     /// The initial settings will be overwritten by the remote peer when
     /// the Settings frame is received. The new value will be set to the
     /// `max_concurrent_streams()` from the frame.
     ///
     /// This setting prevents the caller from exceeding this number of
     /// streams that are counted towards the concurrency limit.
     ///
     /// Sending streams past the limit returned by the peer will be treated
     /// as a stream error of type PROTOCOL_ERROR or REFUSED_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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .initial_max_send_streams(1000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>initial_max_send_streams(<span class="kw-2">&amp;mut </span><span class="self">self</span>, initial: usize) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.initial_max_send_streams = initial;
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the maximum number of concurrent locally reset streams.
     ///
     /// When a stream is explicitly reset, 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .max_concurrent_reset_streams(1000)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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 duration to remember locally reset streams.
     ///
     /// When a stream is explicitly reset, 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::client::*;
     /// # use std::time::Duration;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .reset_stream_duration(Duration::from_secs(10))
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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">/// 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::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .max_pending_accept_reset_streams(100)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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">/// Enables or disables server push promises.
     ///
     /// This value is included in the initial SETTINGS handshake.
     /// Setting this value to value to
     /// false in the initial SETTINGS handshake guarantees that the remote server
     /// will never send a push promise.
     ///
     /// This setting can be changed during the life of a single HTTP/2
     /// connection by sending another settings frame updating the value.
     ///
     /// Default value: `true`.
     ///
     /// # Examples
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::client::*;
     /// # use std::time::Duration;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .enable_push(false)
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # pub fn main() {}
     /// ```
     </span><span class="kw">pub fn </span>enable_push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, enabled: bool) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.settings.set_enable_push(enabled);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Sets the first stream ID to something other than 1.
     </span><span class="attribute">#[cfg(feature = <span class="string">&quot;unstable&quot;</span>)]
     </span><span class="kw">pub fn </span>initial_stream_id(<span class="kw-2">&amp;mut </span><span class="self">self</span>, stream_id: u32) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
         <span class="self">self</span>.stream_id = stream_id.into();
         <span class="macro">assert!</span>(
             <span class="self">self</span>.stream_id.is_client_initiated(),
             <span class="string">&quot;stream id must be odd&quot;
         </span>);
         <span class="self">self
     </span>}

     <span class="doccomment">/// Creates a new configured HTTP/2 client backed by `io`.
     ///
     /// It is expected that `io` already be in an appropriate state to commence
     /// the [HTTP/2 handshake]. The handshake is completed once both the connection
     /// preface and the initial settings frame is sent by the client.
     ///
     /// The handshake future does not wait for the initial settings frame from the
     /// server.
     ///
     /// Returns a future which resolves to the [`Connection`] / [`SendRequest`]
     /// tuple 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
     /// [`Connection`]: struct.Connection.html
     /// [`SendRequest`]: struct.SendRequest.html
     /// [Outbound data type]: ../index.html#outbound-data-type.
     ///
     /// # Examples
     ///
     /// Basic usage:
     ///
     /// ```
     /// # use tokio::io::{AsyncRead, AsyncWrite};
     /// # use h2::client::*;
     /// # use bytes::Bytes;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     ///     -&gt; Result&lt;((SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .handshake(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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::client::*;
     /// #
     /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T)
     /// # -&gt; Result&lt;((SendRequest&lt;&amp;&#39;static [u8]&gt;, Connection&lt;T, &amp;&#39;static [u8]&gt;)), h2::Error&gt;
     /// # {
     /// // `client_fut` is a future representing the completion of the HTTP/2
     /// // handshake.
     /// let client_fut = Builder::new()
     ///     .handshake::&lt;_, &amp;&#39;static [u8]&gt;(my_io);
     /// # client_fut.await
     /// # }
     /// #
     /// # 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; <span class="kw">impl </span>Future&lt;Output = <span class="prelude-ty">Result</span>&lt;(SendRequest&lt;B&gt;, Connection&lt;T, B&gt;), <span class="kw">crate</span>::Error&gt;&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="doccomment">/// Creates a new configured HTTP/2 client 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`] / [`SendRequest`]
 /// tuple 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
 /// [`SendRequest`]: struct.SendRequest.html
 ///
 /// # Examples
 ///
 /// ```
 /// # use tokio::io::{AsyncRead, AsyncWrite};
 /// # use h2::client;
 /// # use h2::client::*;
 /// #
 /// # async fn doc&lt;T: AsyncRead + AsyncWrite + Unpin&gt;(my_io: T) -&gt; Result&lt;(), h2::Error&gt;
 /// # {
 /// let (send_request, connection) = client::handshake(my_io).await?;
 /// // The HTTP/2 handshake has completed, now start polling
 /// // `connection` and use `send_request` to send requests to the
 /// // server.
 /// # Ok(())
 /// # }
 /// #
 /// # pub fn main() {}
 /// ```
 </span><span class="kw">pub async fn </span>handshake&lt;T&gt;(io: T) -&gt; <span class="prelude-ty">Result</span>&lt;(SendRequest&lt;Bytes&gt;, Connection&lt;T, Bytes&gt;), <span class="kw">crate</span>::Error&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
 {
     <span class="kw">let </span>builder = Builder::new();
     builder
         .handshake(io)
         .instrument(<span class="macro">tracing::trace_span!</span>(<span class="string">&quot;client_handshake&quot;</span>))
         .<span class="kw">await
 </span>}

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

 </span><span class="kw">async fn </span>bind_connection&lt;T&gt;(io: <span class="kw-2">&amp;mut </span>T) -&gt; <span class="prelude-ty">Result</span>&lt;(), <span class="kw">crate</span>::Error&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
 {
     <span class="macro">tracing::debug!</span>(<span class="string">&quot;binding client connection&quot;</span>);

     <span class="kw">let </span>msg: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>[u8] = <span class="string">b&quot;PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n&quot;</span>;
     io.write_all(msg).<span class="kw">await</span>.map_err(<span class="kw">crate</span>::Error::from_io)<span class="question-mark">?</span>;

     <span class="macro">tracing::debug!</span>(<span class="string">&quot;client connection bound&quot;</span>);

     <span class="prelude-val">Ok</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">async fn </span>handshake2(
         <span class="kw-2">mut </span>io: T,
         builder: Builder,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;(SendRequest&lt;B&gt;, Connection&lt;T, B&gt;), <span class="kw">crate</span>::Error&gt; {
         bind_connection(<span class="kw-2">&amp;mut </span>io).<span class="kw">await</span><span class="question-mark">?</span>;

         <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="kw">let </span>inner = proto::Connection::new(
             codec,
             proto::Config {
                 next_stream_id: builder.stream_id,
                 initial_max_send_streams: builder.initial_max_send_streams,
                 max_send_buffer_size: builder.max_send_buffer_size,
                 reset_stream_duration: builder.reset_stream_duration,
                 reset_stream_max: builder.reset_stream_max,
                 remote_reset_stream_max: builder.pending_accept_reset_stream_max,
                 settings: builder.settings.clone(),
             },
         );
         <span class="kw">let </span>send_request = SendRequest {
             inner: inner.streams().clone(),
             pending: <span class="prelude-val">None</span>,
         };

         <span class="kw">let </span><span class="kw-2">mut </span>connection = Connection { inner };
         <span class="kw">if let </span><span class="prelude-val">Some</span>(sz) = builder.initial_target_connection_window_size {
             connection.set_target_window_size(sz);
         }

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

     <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>.inner.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>.inner.set_initial_window_size(size)<span class="question-mark">?</span>;
         <span class="prelude-val">Ok</span>(())
     }

     <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>.inner.take_user_pings().map(PingPong::new)
     }

     <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated
     /// by this client.
     ///
     /// This limit is configured by the server 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>.inner.max_send_streams()
     }
     <span class="doccomment">/// Returns the maximum number of concurrent streams that may be initiated
     /// by the server 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>.inner.max_recv_streams()
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; Future <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite + Unpin,
     B: Buf,
 {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;(), <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="self">self</span>.inner.maybe_close_connection_if_no_streams();
         <span class="self">self</span>.inner.poll(cx).map_err(Into::into)
     }
 }

 <span class="kw">impl</span>&lt;T, B&gt; fmt::Debug <span class="kw">for </span>Connection&lt;T, B&gt;
 <span class="kw">where
     </span>T: AsyncRead + AsyncWrite,
     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::fmt(<span class="kw-2">&amp;</span><span class="self">self</span>.inner, fmt)
     }
 }

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

 </span><span class="kw">impl </span>Future <span class="kw">for </span>ResponseFuture {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;Response&lt;RecvStream&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>(parts, <span class="kw">_</span>) = <span class="macro">ready!</span>(<span class="self">self</span>.inner.poll_response(cx))<span class="question-mark">?</span>.into_parts();
         <span class="kw">let </span>body = RecvStream::new(FlowControl::new(<span class="self">self</span>.inner.clone()));

         Poll::Ready(<span class="prelude-val">Ok</span>(Response::from_parts(parts, body)))
     }
 }

 <span class="kw">impl </span>ResponseFuture {
     <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="doccomment">/// Returns a stream of PushPromises
     ///
     /// # Panics
     ///
     /// If this method has been called before
     /// or the stream was itself was pushed
     </span><span class="kw">pub fn </span>push_promises(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; PushPromises {
         <span class="kw">if </span><span class="self">self</span>.push_promise_consumed {
             <span class="macro">panic!</span>(<span class="string">&quot;Reference to push promises stream taken!&quot;</span>);
         }
         <span class="self">self</span>.push_promise_consumed = <span class="bool-val">true</span>;
         PushPromises {
             inner: <span class="self">self</span>.inner.clone(),
         }
     }
 }

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

 </span><span class="kw">impl </span>PushPromises {
     <span class="doccomment">/// Get the next `PushPromise`.
     </span><span class="kw">pub async fn </span>push_promise(<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;PushPromise, <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_push_promise(cx)).<span class="kw">await
     </span>}

     <span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub fn </span>poll_push_promise(
         <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;PushPromise, <span class="kw">crate</span>::Error&gt;&gt;&gt; {
         <span class="kw">match </span><span class="self">self</span>.inner.poll_pushed(cx) {
             Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>((request, response)))) =&gt; {
                 <span class="kw">let </span>response = PushedResponseFuture {
                     inner: ResponseFuture {
                         inner: response,
                         push_promise_consumed: <span class="bool-val">false</span>,
                     },
                 };
                 Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(PushPromise { request, response })))
             }
             Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e))) =&gt; Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(e.into()))),
             Poll::Ready(<span class="prelude-val">None</span>) =&gt; Poll::Ready(<span class="prelude-val">None</span>),
             Poll::Pending =&gt; Poll::Pending,
         }
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;stream&quot;</span>)]
 </span><span class="kw">impl </span>futures_core::Stream <span class="kw">for </span>PushPromises {
     <span class="kw">type </span>Item = <span class="prelude-ty">Result</span>&lt;PushPromise, <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_push_promise(cx)
     }
 }

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

 </span><span class="kw">impl </span>PushPromise {
     <span class="doccomment">/// Returns a reference to the push promise&#39;s request headers.
     </span><span class="kw">pub fn </span>request(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Request&lt;()&gt; {
         <span class="kw-2">&amp;</span><span class="self">self</span>.request
     }

     <span class="doccomment">/// Returns a mutable reference to the push promise&#39;s request headers.
     </span><span class="kw">pub fn </span>request_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>Request&lt;()&gt; {
         <span class="kw-2">&amp;mut </span><span class="self">self</span>.request
     }

     <span class="doccomment">/// Consumes `self`, returning the push promise&#39;s request headers and
     /// response future.
     </span><span class="kw">pub fn </span>into_parts(<span class="self">self</span>) -&gt; (Request&lt;()&gt;, PushedResponseFuture) {
         (<span class="self">self</span>.request, <span class="self">self</span>.response)
     }
 }

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

 </span><span class="kw">impl </span>Future <span class="kw">for </span>PushedResponseFuture {
     <span class="kw">type </span>Output = <span class="prelude-ty">Result</span>&lt;Response&lt;RecvStream&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; {
         Pin::new(<span class="kw-2">&amp;mut </span><span class="self">self</span>.inner).poll(cx)
     }
 }

 <span class="kw">impl </span>PushedResponseFuture {
     <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 Peer =====

 </span><span class="kw">impl </span>Peer {
     <span class="kw">pub fn </span>convert_send_message(
         id: StreamId,
         request: Request&lt;()&gt;,
         protocol: <span class="prelude-ty">Option</span>&lt;Protocol&gt;,
         end_of_stream: bool,
     ) -&gt; <span class="prelude-ty">Result</span>&lt;Headers, SendError&gt; {
         <span class="kw">use </span>http::request::Parts;

         <span class="kw">let </span>(
             Parts {
                 method,
                 uri,
                 headers,
                 version,
                 ..
             },
             <span class="kw">_</span>,
         ) = request.into_parts();

         <span class="kw">let </span>is_connect = method == Method::CONNECT;

         <span class="comment">// Build the set pseudo header set. All requests will include `method`
         // and `path`.
         </span><span class="kw">let </span><span class="kw-2">mut </span>pseudo = Pseudo::request(method, uri, protocol);

         <span class="kw">if </span>pseudo.scheme.is_none() {
             <span class="comment">// If the scheme is not set, then there are a two options.
             //
             // 1) Authority is not set. In this case, a request was issued with
             //    a relative URI. This is permitted **only** when forwarding
             //    HTTP 1.x requests. If the HTTP version is set to 2.0, then
             //    this is an error.
             //
             // 2) Authority is set, then the HTTP method *must* be CONNECT.
             //
             // It is not possible to have a scheme but not an authority set (the
             // `http` crate does not allow it).
             //
             </span><span class="kw">if </span>pseudo.authority.is_none() {
                 <span class="kw">if </span>version == Version::HTTP_2 {
                     <span class="kw">return </span><span class="prelude-val">Err</span>(UserError::MissingUriSchemeAndAuthority.into());
                 } <span class="kw">else </span>{
                     <span class="comment">// This is acceptable as per the above comment. However,
                     // HTTP/2 requires that a scheme is set. Since we are
                     // forwarding an HTTP 1.1 request, the scheme is set to
                     // &quot;http&quot;.
                     </span>pseudo.set_scheme(uri::Scheme::HTTP);
                 }
             } <span class="kw">else if </span>!is_connect {
                 <span class="comment">// TODO: Error
             </span>}
         }

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

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

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

 <span class="kw">impl </span>proto::Peer <span class="kw">for </span>Peer {
     <span class="kw">type </span>Poll = Response&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;Client&quot;</span>;

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

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

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

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

         <span class="kw">if let </span><span class="prelude-val">Some</span>(status) = pseudo.status {
             b = b.status(status);
         }

         <span class="kw">let </span><span class="kw-2">mut </span>response = <span class="kw">match </span>b.body(()) {
             <span class="prelude-val">Ok</span>(response) =&gt; response,
             <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
                 <span class="comment">// TODO: Should there be more specialized handling for different
                 // kinds of errors
                 </span><span class="kw">return </span><span class="prelude-val">Err</span>(Error::library_reset(stream_id, Reason::PROTOCOL_ERROR));
             }
         };

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

         <span class="prelude-val">Ok</span>(response)
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="h2" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>