Quelle client.rs

Sprache: Rust

//! The legacy HTTP Client from 0.14.x
//!
//! This `Client` will eventually be deconstructed into more composable parts.
//! For now, to enable people to use hyper 1.0 quicker, this `Client` exists
//! in much the same way it did in hyper 0.14.

use std::error::Error as StdError;
use std::fmt;
use std::future::{poll_fn, Future};
use std::pin::Pin;
use std::task::{self, Poll};
use std::time::Duration;

use futures_util::future::{self, Either, FutureExt, TryFutureExt};
use http::uri::Scheme;
use hyper::client::conn::TrySendError as ConnTrySendError;
use hyper::header::{HeaderValue, HOST};
use hyper::rt::Timer;
use hyper::{body::Body, Method, Request, Response, Uri, Version};
use tracing::{debug, trace, warn};

use super::connect::capture::CaptureConnectionExtension;
#[cfg(feature = "tokio")]
use super::connect::HttpConnector;
use super::connect::{Alpn, Connect, Connected, Connection};
use super::pool::{self, Ver};

use crate::common::{lazy as hyper_lazy, timer, Exec, Lazy, SyncWrapper};

type BoxSendFuture = Pin<Box<dyn Future<Output = ()> + Send>>;

/// A Client to make outgoing HTTP requests.
///
/// `Client` is cheap to clone and cloning is the recommended way to share a `Client`. The
/// underlying connection pool will be reused.
#[cfg_attr(docsrs, doc(cfg(any(feature = "http1", feature = "http2"))))]
pub struct Client<C, B> {
 config: Config,
 connector: C,
 exec: Exec,
 #[cfg(feature = "http1")]
 h1_builder: hyper::client::conn::http1::Builder,
 #[cfg(feature = "http2")]
 h2_builder: hyper::client::conn::http2::Builder<Exec>,
 pool: pool::Pool<PoolClient, PoolKey>,
}

#[derive(Clone, Copy, Debug)]
struct Config {
 retry_canceled_requests: bool,
 set_host: bool,
 ver: Ver,
}

/// Client errors
pub struct Error {
 kind: ErrorKind,
 source: Option<Box<dyn StdError + Send + Sync>>,
 #[cfg(any(feature = "http1", feature = "http2"))]
 connect_info: Option<Connected>,
}

#[derive(Debug)]
enum ErrorKind {
 Canceled,
 ChannelClosed,
 Connect,
 UserUnsupportedRequestMethod,
 UserUnsupportedVersion,
 UserAbsoluteUriRequired,
 SendRequest,
}

macro_rules! e {
 ($kind:ident) => {
 Error {
 kind: ErrorKind::$kind,
 source: None,
 connect_info: None,
 }
 };
 ($kind:ident, $src:expr) => {
 Error {
 kind: ErrorKind::$kind,
 source: Some($src.into()),
 connect_info: None,
 }
 };
}

// We might change this... :shrug:
type PoolKey = (http::uri::Scheme, http::uri::Authority);

enum TrySendError {
 Retryable {
 error: Error,
 req: Request,
 connection_reused: bool,
 },
 Nope(Error),
}

/// A `Future` that will resolve to an HTTP Response.
///
/// This is returned by `Client::request` (and `Client::get`).
#[must_use = "futures do nothing unless polled"]
pub struct ResponseFuture {
 inner: SyncWrapper<
 Pin<Box<dyn Future<Output = Result<Response<hyper::body::Incoming>, Error>> + Send>>,
 >,
}

// ===== impl Client =====

impl Client<(), ()> {
 /// Create a builder to configure a new `Client`.
 ///
 /// # Example
 ///
 /// ```
 /// # #[cfg(feature = "tokio")]
 /// # fn run () {
 /// use std::time::Duration;
 /// use hyper_util::client::legacy::Client;
 /// use hyper_util::rt::{TokioExecutor, TokioTimer};
 ///
 /// let client = Client::builder(TokioExecutor::new())
 /// .pool_timer(TokioTimer::new())
 /// .pool_idle_timeout(Duration::from_secs(30))
 /// .http2_only(true)
 /// .build_http();
 /// # let infer: Client<_, http_body_util::Full<bytes::Bytes>> = client;
 /// # drop(infer);
 /// # }
 /// # fn main() {}
 /// ```
 pub fn builder<E>(executor: E) -> Builder
 where
 E: hyper::rt::Executor<BoxSendFuture> + Send + Sync + Clone + 'static,
 {
 Builder::new(executor)
 }
}

impl<C, B> Client<C, B>
where
 C: Connect + Clone + Send + Sync + 'static,
 B: Body + Send + 'static + Unpin,
 B::Data: Send,
 B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
 /// Send a `GET` request to the supplied `Uri`.
 ///
 /// # Note
 ///
 /// This requires that the `Body` type have a `Default` implementation.
 /// It *should* return an "empty" version of itself, such that
 /// `Body::is_end_stream` is `true`.
 ///
 /// # Example
 ///
 /// ```
 /// # #[cfg(feature = "tokio")]
 /// # fn run () {
 /// use hyper::Uri;
 /// use hyper_util::client::legacy::Client;
 /// use hyper_util::rt::TokioExecutor;
 /// use bytes::Bytes;
 /// use http_body_util::Full;
 ///
 /// let client: Client<_, Full<Bytes>> = Client::builder(TokioExecutor::new()).build_http();
 ///
 /// let future = client.get(Uri::from_static("http://httpbin.org/ip"));
 /// # }
 /// # fn main() {}
 /// ```
 pub fn get(&self, uri: Uri) -> ResponseFuture
 where
 B: Default,
 {
 let body = B::default();
 if !body.is_end_stream() {
 warn!("default Body used for get() does not return true for is_end_stream");
 }

 let mut req = Request::new(body);
 *req.uri_mut() = uri;
 self.request(req)
 }

 /// Send a constructed `Request` using this `Client`.
 ///
 /// # Example
 ///
 /// ```
 /// # #[cfg(feature = "tokio")]
 /// # fn run () {
 /// use hyper::{Method, Request};
 /// use hyper_util::client::legacy::Client;
 /// use http_body_util::Full;
 /// use hyper_util::rt::TokioExecutor;
 /// use bytes::Bytes;
 ///
 /// let client: Client<_, Full<Bytes>> = Client::builder(TokioExecutor::new()).build_http();
 ///
 /// let req: Request<Full<Bytes>> = Request::builder()
 /// .method(Method::POST)
 /// .uri("http://httpbin.org/post")
 /// .body(Full::from("Hallo!"))
 /// .expect("request builder");
 ///
 /// let future = client.request(req);
 /// # }
 /// # fn main() {}
 /// ```
 pub fn request(&self, mut req: Request) -> ResponseFuture {
 let is_http_connect = req.method() == Method::CONNECT;
 match req.version() {
 Version::HTTP_11 => (),
 Version::HTTP_10 => {
 if is_http_connect {
 warn!("CONNECT is not allowed for HTTP/1.0");
 return ResponseFuture::new(future::err(e!(UserUnsupportedRequestMethod)));
 }
 }
 Version::HTTP_2 => (),
 // completely unsupported HTTP version (like HTTP/0.9)!
 other => return ResponseFuture::error_version(other),
 };

 let pool_key = match extract_domain(req.uri_mut(), is_http_connect) {
 Ok(s) => s,
 Err(err) => {
 return ResponseFuture::new(future::err(err));
 }
 };

 ResponseFuture::new(self.clone().send_request(req, pool_key))
 }

 async fn send_request(
 self,
 mut req: Request,
 pool_key: PoolKey,
 ) -> Result<Response<hyper::body::Incoming>, Error> {
 let uri = req.uri().clone();

 loop {
 req = match self.try_send_request(req, pool_key.clone()).await {
 Ok(resp) => return Ok(resp),
 Err(TrySendError::Nope(err)) => return Err(err),
 Err(TrySendError::Retryable {
 mut req,
 error,
 connection_reused,
 }) => {
 if !self.config.retry_canceled_requests || !connection_reused {
 // if client disabled, don't retry
 // a fresh connection means we definitely can't retry
 return Err(error);
 }

 trace!(
 "unstarted request canceled, trying again (reason={:?})",
 error
 );
 *req.uri_mut() = uri.clone();
 req
 }
 }
 }
 }

 async fn try_send_request(
 &self,
 mut req: Request,
 pool_key: PoolKey,
 ) -> Result<Response<hyper::body::Incoming>, TrySendError> {
 let mut pooled = self
 .connection_for(pool_key)
 .await
 // `connection_for` already retries checkout errors, so if
 // it returns an error, there's not much else to retry
 .map_err(TrySendError::Nope)?;

 if let Some(conn) = req.extensions_mut().get_mut::<CaptureConnectionExtension>() {
 conn.set(&pooled.conn_info);
 }

 if pooled.is_http1() {
 if req.version() == Version::HTTP_2 {
 warn!("Connection is HTTP/1, but request requires HTTP/2");
 return Err(TrySendError::Nope(
 e!(UserUnsupportedVersion).with_connect_info(pooled.conn_info.clone()),
 ));
 }

 if self.config.set_host {
 let uri = req.uri().clone();
 req.headers_mut().entry(HOST).or_insert_with(|| {
 let hostname = uri.host().expect("authority implies host");
 if let Some(port) = get_non_default_port(&uri) {
 let s = format!("{hostname}:{port}");
 HeaderValue::from_maybe_shared(bytes::Bytes::from(s))
 } else {
 HeaderValue::from_str(hostname)
 }
 .expect("uri host is valid header value")
 });
 }

 // CONNECT always sends authority-form, so check it first...
 if req.method() == Method::CONNECT {
 authority_form(req.uri_mut());
 } else if pooled.conn_info.is_proxied {
 absolute_form(req.uri_mut());
 } else {
 origin_form(req.uri_mut());
 }
 } else if req.method() == Method::CONNECT && !pooled.is_http2() {
 authority_form(req.uri_mut());
 }

 let mut res = match pooled.try_send_request(req).await {
 Ok(res) => res,
 Err(mut err) => {
 return if let Some(req) = err.take_message() {
 Err(TrySendError::Retryable {
 connection_reused: pooled.is_reused(),
 error: e!(Canceled, err.into_error())
 .with_connect_info(pooled.conn_info.clone()),
 req,
 })
 } else {
 Err(TrySendError::Nope(
 e!(SendRequest, err.into_error())
 .with_connect_info(pooled.conn_info.clone()),
 ))
 };
 }
 };

 // If the Connector included 'extra' info, add to Response...
 if let Some(extra) = &pooled.conn_info.extra {
 extra.set(res.extensions_mut());
 }

 // If pooled is HTTP/2, we can toss this reference immediately.
 //
 // when pooled is dropped, it will try to insert back into the
 // pool. To delay that, spawn a future that completes once the
 // sender is ready again.
 //
 // This *should* only be once the related `Connection` has polled
 // for a new request to start.
 //
 // It won't be ready if there is a body to stream.
 if pooled.is_http2() || !pooled.is_pool_enabled() || pooled.is_ready() {
 drop(pooled);
 } else {
 let on_idle = poll_fn(move |cx| pooled.poll_ready(cx)).map(|_| ());
 self.exec.execute(on_idle);
 }

 Ok(res)
 }

 async fn connection_for(
 &self,
 pool_key: PoolKey,
 ) -> Result<pool::Pooled<PoolClient, PoolKey>, Error> {
 loop {
 match self.one_connection_for(pool_key.clone()).await {
 Ok(pooled) => return Ok(pooled),
 Err(ClientConnectError::Normal(err)) => return Err(err),
 Err(ClientConnectError::CheckoutIsClosed(reason)) => {
 if !self.config.retry_canceled_requests {
 return Err(e!(Connect, reason));
 }

 trace!(
 "unstarted request canceled, trying again (reason={:?})",
 reason,
 );
 continue;
 }
 };
 }
 }

 async fn one_connection_for(
 &self,
 pool_key: PoolKey,
 ) -> Result<pool::Pooled<PoolClient, PoolKey>, ClientConnectError> {
 // Return a single connection if pooling is not enabled
 if !self.pool.is_enabled() {
 return self
 .connect_to(pool_key)
 .await
 .map_err(ClientConnectError::Normal);
 }

 // This actually races 2 different futures to try to get a ready
 // connection the fastest, and to reduce connection churn.
 //
 // - If the pool has an idle connection waiting, that's used
 // immediately.
 // - Otherwise, the Connector is asked to start connecting to
 // the destination Uri.
 // - Meanwhile, the pool Checkout is watching to see if any other
 // request finishes and tries to insert an idle connection.
 // - If a new connection is started, but the Checkout wins after
 // (an idle connection became available first), the started
 // connection future is spawned into the runtime to complete,
 // and then be inserted into the pool as an idle connection.
 let checkout = self.pool.checkout(pool_key.clone());
 let connect = self.connect_to(pool_key);
 let is_ver_h2 = self.config.ver == Ver::Http2;

 // The order of the `select` is depended on below...

 match future::select(checkout, connect).await {
 // Checkout won, connect future may have been started or not.
 //
 // If it has, let it finish and insert back into the pool,
 // so as to not waste the socket...
 Either::Left((Ok(checked_out), connecting)) => {
 // This depends on the `select` above having the correct
 // order, such that if the checkout future were ready
 // immediately, the connect future will never have been
 // started.
 //
 // If it *wasn't* ready yet, then the connect future will
 // have been started...
 if connecting.started() {
 let bg = connecting
 .map_err(|err| {
 trace!("background connect error: {}", err);
 })
 .map(|_pooled| {
 // dropping here should just place it in
 // the Pool for us...
 });
 // An execute error here isn't important, we're just trying
 // to prevent a waste of a socket...
 self.exec.execute(bg);
 }
 Ok(checked_out)
 }
 // Connect won, checkout can just be dropped.
 Either::Right((Ok(connected), _checkout)) => Ok(connected),
 // Either checkout or connect could get canceled:
 //
 // 1. Connect is canceled if this is HTTP/2 and there is
 // an outstanding HTTP/2 connecting task.
 // 2. Checkout is canceled if the pool cannot deliver an
 // idle connection reliably.
 //
 // In both cases, we should just wait for the other future.
 Either::Left((Err(err), connecting)) => {
 if err.is_canceled() {
 connecting.await.map_err(ClientConnectError::Normal)
 } else {
 Err(ClientConnectError::Normal(e!(Connect, err)))
 }
 }
 Either::Right((Err(err), checkout)) => {
 if err.is_canceled() {
 checkout.await.map_err(move |err| {
 if is_ver_h2 && err.is_canceled() {
 ClientConnectError::CheckoutIsClosed(err)
 } else {
 ClientConnectError::Normal(e!(Connect, err))
 }
 })
 } else {
 Err(ClientConnectError::Normal(err))
 }
 }
 }
 }

 #[cfg(any(feature = "http1", feature = "http2"))]
 fn connect_to(
 &self,
 pool_key: PoolKey,
 ) -> impl Lazy<Output = Result<pool::Pooled<PoolClient, PoolKey>, Error>> + Send + Unpin
 {
 let executor = self.exec.clone();
 let pool = self.pool.clone();
 #[cfg(feature = "http1")]
 let h1_builder = self.h1_builder.clone();
 #[cfg(feature = "http2")]
 let h2_builder = self.h2_builder.clone();
 let ver = self.config.ver;
 let is_ver_h2 = ver == Ver::Http2;
 let connector = self.connector.clone();
 let dst = domain_as_uri(pool_key.clone());
 hyper_lazy(move || {
 // Try to take a "connecting lock".
 //
 // If the pool_key is for HTTP/2, and there is already a
 // connection being established, then this can't take a
 // second lock. The "connect_to" future is Canceled.
 let connecting = match pool.connecting(&pool_key, ver) {
 Some(lock) => lock,
 None => {
 let canceled = e!(Canceled);
 // TODO
 //crate::Error::new_canceled().with("HTTP/2 connection in progress");
 return Either::Right(future::err(canceled));
 }
 };
 Either::Left(
 connector
 .connect(super::connect::sealed::Internal, dst)
 .map_err(|src| e!(Connect, src))
 .and_then(move |io| {
 let connected = io.connected();
 // If ALPN is h2 and we aren't http2_only already,
 // then we need to convert our pool checkout into
 // a single HTTP2 one.
 let connecting = if connected.alpn == Alpn::H2 && !is_ver_h2 {
 match connecting.alpn_h2(&pool) {
 Some(lock) => {
 trace!("ALPN negotiated h2, updating pool");
 lock
 }
 None => {
 // Another connection has already upgraded,
 // the pool checkout should finish up for us.
 let canceled = e!(Canceled, "ALPN upgraded to HTTP/2");
 return Either::Right(future::err(canceled));
 }
 }
 } else {
 connecting
 };

 #[cfg_attr(not(feature = "http2"), allow(unused))]
 let is_h2 = is_ver_h2 || connected.alpn == Alpn::H2;

 Either::Left(Box::pin(async move {
 let tx = if is_h2 {
 #[cfg(feature = "http2")] {
 let (mut tx, conn) =
 h2_builder.handshake(io).await.map_err(Error::tx)?;

 trace!(
 "http2 handshake complete, spawning background dispatcher task"
 );
 executor.execute(
 conn.map_err(|e| debug!("client connection error: {}", e))
 .map(|_| ()),
 );

 // Wait for 'conn' to ready up before we
 // declare this tx as usable
 tx.ready().await.map_err(Error::tx)?;
 PoolTx::Http2(tx)
 }
 #[cfg(not(feature = "http2"))]
 panic!("http2 feature is not enabled");
 } else {
 #[cfg(feature = "http1")] {
 // Perform the HTTP/1.1 handshake on the provided I/O stream.
 // Uses the h1_builder to establish a connection, returning a sender (tx) for requests
 // and a connection task (conn) that manages the connection lifecycle.
 let (mut tx, conn) =
 h1_builder.handshake(io).await.map_err(crate::client::legacy::client::Error::tx)?;

 // Log that the HTTP/1.1 handshake has completed successfully.
 // This indicates the connection is established and ready for request processing.
 trace!(
 "http1 handshake complete, spawning background dispatcher task"
 );
 // Create a oneshot channel to communicate errors from the connection task.
 // err_tx sends errors from the connection task, and err_rx receives them
 // to correlate connection failures with request readiness errors.
 let (err_tx, err_rx) = tokio::sync::oneshot::channel();
 // Spawn the connection task in the background using the executor.
 // The task manages the HTTP/1.1 connection, including upgrades (e.g., WebSocket).
 // Errors are sent via err_tx to ensure they can be checked if the sender (tx) fails.
 executor.execute(
 conn.with_upgrades()
 .map_err(|e| {
 // Log the connection error at debug level for diagnostic purposes.
 debug!("client connection error: {:?}", e);
 // Log that the error is being sent to the error channel.
 trace!("sending connection error to error channel");
 // Send the error via the oneshot channel, ignoring send failures
 // (e.g., if the receiver is dropped, which is handled later).
 let _ =err_tx.send(e);
 })
 .map(|_| ()),
 );
 // Log that the client is waiting for the connection to be ready.
 // Readiness indicates the sender (tx) can accept a request without blocking.
 trace!("waiting for connection to be ready");
 // Check if the sender is ready to accept a request.
 // This ensures the connection is fully established before proceeding.
 // aka:
 // Wait for 'conn' to ready up before we
 // declare this tx as usable
 match tx.ready().await {
 // If ready, the connection is usable for sending requests.
 Ok(_) => {
 // Log that the connection is ready for use.
 trace!("connection is ready");
 // Drop the error receiver, as it’s no longer needed since the sender is ready.
 // This prevents waiting for errors that won’t occur in a successful case.
 drop(err_rx);
 // Wrap the sender in PoolTx::Http1 for use in the connection pool.
 PoolTx::Http1(tx)
 }
 // If the sender fails with a closed channel error, check for a specific connection error.
 // This distinguishes between a vague ChannelClosed error and an actual connection failure.
 Err(e) if e.is_closed() => {
 // Log that the channel is closed, indicating a potential connection issue.
 trace!("connection channel closed, checking for connection error");
 // Check the oneshot channel for a specific error from the connection task.
 match err_rx.await {
 // If an error was received, it’s a specific connection failure.
 Ok(err) => {
 // Log the specific connection error for diagnostics.
 trace!("received connection error: {:?}", err);
 // Return the error wrapped in Error::tx to propagate it.
 return Err(crate::client::legacy::client::Error::tx(err));
 }
 // If the error channel is closed, no specific error was sent.
 // Fall back to the vague ChannelClosed error.
 Err(_) => {
 // Log that the error channel is closed, indicating no specific error.
 trace!("error channel closed, returning the vague ChannelClosed error");
 // Return the original error wrapped in Error::tx.
 return Err(crate::client::legacy::client::Error::tx(e));
 }
 }
 }
 // For other errors (e.g., timeout, I/O issues), propagate them directly.
 // These are not ChannelClosed errors and don’t require error channel checks.
 Err(e) => {
 // Log the specific readiness failure for diagnostics.
 trace!("connection readiness failed: {:?}", e);
 // Return the error wrapped in Error::tx to propagate it.
 return Err(crate::client::legacy::client::Error::tx(e));
 }
 }
 }
 #[cfg(not(feature = "http1"))] {
 panic!("http1 feature is not enabled");
 }
 };

 Ok(pool.pooled(
 connecting,
 PoolClient {
 conn_info: connected,
 tx,
 },
 ))
 }))
 }),
 )
 })
 }
}

impl<C, B> tower_service::Service<Request> for Client<C, B>
where
 C: Connect + Clone + Send + Sync + 'static,
 B: Body + Send + 'static + Unpin,
 B::Data: Send,
 B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
 type Response = Response<hyper::body::Incoming>;
 type Error = Error;
 type Future = ResponseFuture;

 fn poll_ready(&mut self, _: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
 Poll::Ready(Ok(()))
 }

 fn call(&mut self, req: Request) -> Self::Future {
 self.request(req)
 }
}

impl<C, B> tower_service::Service<Request> for &'_ Client<C, B>
where
 C: Connect + Clone + Send + Sync + 'static,
 B: Body + Send + 'static + Unpin,
 B::Data: Send,
 B::Error: Into<Box<dyn StdError + Send + Sync>>,
{
 type Response = Response<hyper::body::Incoming>;
 type Error = Error;
 type Future = ResponseFuture;

 fn poll_ready(&mut self, _: &mut task::Context<'_>) -> Poll<Result<(), Self::Error>> {
 Poll::Ready(Ok(()))
 }

 fn call(&mut self, req: Request) -> Self::Future {
 self.request(req)
 }
}

impl<C: Clone, B> Clone for Client<C, B> {
 fn clone(&self) -> Client<C, B> {
 Client {
 config: self.config,
 exec: self.exec.clone(),
 #[cfg(feature = "http1")]
 h1_builder: self.h1_builder.clone(),
 #[cfg(feature = "http2")]
 h2_builder: self.h2_builder.clone(),
 connector: self.connector.clone(),
 pool: self.pool.clone(),
 }
 }
}

impl<C, B> fmt::Debug for Client<C, B> {
 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 f.debug_struct("Client").finish()
 }
}

// ===== impl ResponseFuture =====

impl ResponseFuture {
 fn new<F>(value: F) -> Self
 where
 F: Future<Output = Result<Response<hyper::body::Incoming>, Error>> + Send + 'static,
 {
 Self {
 inner: SyncWrapper::new(Box::pin(value)),
 }
 }

 fn error_version(ver: Version) -> Self {
 warn!("Request has unsupported version \"{:?}\"", ver);
 ResponseFuture::new(Box::pin(future::err(e!(UserUnsupportedVersion))))
 }
}

impl fmt::Debug for ResponseFuture {
 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 f.pad("Future<Response>")
 }
}

impl Future for ResponseFuture {
 type Output = Result<Response<hyper::body::Incoming>, Error>;

 fn poll(mut self: Pin<&mut Self>, cx: &mut task::Context<'_>) -> Poll<Self::Output> {
 self.inner.get_mut().as_mut().poll(cx)
 }
}

// ===== impl PoolClient =====

// FIXME: allow() required due to `impl Trait` leaking types to this lint
#[allow(missing_debug_implementations)]
struct PoolClient {
 conn_info: Connected,
 tx: PoolTx,
}

enum PoolTx {
 #[cfg(feature = "http1")]
 Http1(hyper::client::conn::http1::SendRequest),
 #[cfg(feature = "http2")]
 Http2(hyper::client::conn::http2::SendRequest),
}

impl PoolClient {
 fn poll_ready(
 &mut self,
 #[allow(unused_variables)] cx: &mut task::Context<'_>,
 ) -> Poll<Result<(), Error>> {
 match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(ref mut tx) => tx.poll_ready(cx).map_err(Error::closed),
 #[cfg(feature = "http2")]
 PoolTx::Http2(_) => Poll::Ready(Ok(())),
 }
 }

 fn is_http1(&self) -> bool {
 !self.is_http2()
 }

 fn is_http2(&self) -> bool {
 match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(_) => false,
 #[cfg(feature = "http2")]
 PoolTx::Http2(_) => true,
 }
 }

 fn is_poisoned(&self) -> bool {
 self.conn_info.poisoned.poisoned()
 }

 fn is_ready(&self) -> bool {
 match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(ref tx) => tx.is_ready(),
 #[cfg(feature = "http2")]
 PoolTx::Http2(ref tx) => tx.is_ready(),
 }
 }
}

impl<B: Body + 'static> PoolClient {
 fn try_send_request(
 &mut self,
 req: Request,
 ) -> impl Future<Output = Result<Response<hyper::body::Incoming>, ConnTrySendError<Request>>>
 where
 B: Send,
 {
 #[cfg(all(feature = "http1", feature = "http2"))]
 return match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(ref mut tx) => Either::Left(tx.try_send_request(req)),
 #[cfg(feature = "http2")]
 PoolTx::Http2(ref mut tx) => Either::Right(tx.try_send_request(req)),
 };

 #[cfg(feature = "http1")]
 #[cfg(not(feature = "http2"))]
 return match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(ref mut tx) => tx.try_send_request(req),
 };

 #[cfg(not(feature = "http1"))]
 #[cfg(feature = "http2")]
 return match self.tx {
 #[cfg(feature = "http2")]
 PoolTx::Http2(ref mut tx) => tx.try_send_request(req),
 };
 }
}

impl pool::Poolable for PoolClient
where
 B: Send + 'static,
{
 fn is_open(&self) -> bool {
 !self.is_poisoned() && self.is_ready()
 }

 fn reserve(self) -> pool::Reservation<Self> {
 match self.tx {
 #[cfg(feature = "http1")]
 PoolTx::Http1(tx) => pool::Reservation::Unique(PoolClient {
 conn_info: self.conn_info,
 tx: PoolTx::Http1(tx),
 }),
 #[cfg(feature = "http2")]
 PoolTx::Http2(tx) => {
 let b = PoolClient {
 conn_info: self.conn_info.clone(),
 tx: PoolTx::Http2(tx.clone()),
 };
 let a = PoolClient {
 conn_info: self.conn_info,
 tx: PoolTx::Http2(tx),
 };
 pool::Reservation::Shared(a, b)
 }
 }
 }

 fn can_share(&self) -> bool {
 self.is_http2()
 }
}

enum ClientConnectError {
 Normal(Error),
 CheckoutIsClosed(pool::Error),
}

fn origin_form(uri: &mut Uri) {
 let path = match uri.path_and_query() {
 Some(path) if path.as_str() != "/" => {
 let mut parts = ::http::uri::Parts::default();
 parts.path_and_query = Some(path.clone());
 Uri::from_parts(parts).expect("path is valid uri")
 }
 _none_or_just_slash => {
 debug_assert!(Uri::default() == "/");
 Uri::default()
 }
 };
 *uri = path
}

fn absolute_form(uri: &mut Uri) {
 debug_assert!(uri.scheme().is_some(), "absolute_form needs a scheme");
 debug_assert!(
 uri.authority().is_some(),
 "absolute_form needs an authority"
 );
}

fn authority_form(uri: &mut Uri) {
 if let Some(path) = uri.path_and_query() {
 // `https://hyper.rs` would parse with `/` path, don't
 // annoy people about that...
 if path != "/" {
 warn!("HTTP/1.1 CONNECT request stripping path: {:?}", path);
 }
 }
 *uri = match uri.authority() {
 Some(auth) => {
 let mut parts = ::http::uri::Parts::default();
 parts.authority = Some(auth.clone());
 Uri::from_parts(parts).expect("authority is valid")
 }
 None => {
 unreachable!("authority_form with relative uri");
 }
 };
}

fn extract_domain(uri: &mut Uri, is_http_connect: bool) -> Result<PoolKey, Error> {
 let uri_clone = uri.clone();
 match (uri_clone.scheme(), uri_clone.authority()) {
 (Some(scheme), Some(auth)) => Ok((scheme.clone(), auth.clone())),
 (None, Some(auth)) if is_http_connect => {
 let scheme = match auth.port_u16() {
 Some(443) => {
 set_scheme(uri, Scheme::HTTPS);
 Scheme::HTTPS
 }
 _ => {
 set_scheme(uri, Scheme::HTTP);
 Scheme::HTTP
 }
 };
 Ok((scheme, auth.clone()))
 }
 _ => {
 debug!("Client requires absolute-form URIs, received: {:?}", uri);
 Err(e!(UserAbsoluteUriRequired))
 }
 }
}

fn domain_as_uri((scheme, auth): PoolKey) -> Uri {
 http::uri::Builder::new()
 .scheme(scheme)
 .authority(auth)
 .path_and_query("/")
 .build()
 .expect("domain is valid Uri")
}

fn set_scheme(uri: &mut Uri, scheme: Scheme) {
 debug_assert!(
 uri.scheme().is_none(),
 "set_scheme expects no existing scheme"
 );
 let old = std::mem::take(uri);
 let mut parts: ::http::uri::Parts = old.into();
 parts.scheme = Some(scheme);
 parts.path_and_query = Some("/".parse().expect("slash is a valid path"));
 *uri = Uri::from_parts(parts).expect("scheme is valid");
}

fn get_non_default_port(uri: &Uri) -> Option<http::uri::Port<&str>> {
 match (uri.port().map(|p| p.as_u16()), is_schema_secure(uri)) {
 (Some(443), true) => None,
 (Some(80), false) => None,
 _ => uri.port(),
 }
}

fn is_schema_secure(uri: &Uri) -> bool {
 uri.scheme_str()
 .map(|scheme_str| matches!(scheme_str, "wss" | "https"))
 .unwrap_or_default()
}

/// A builder to configure a new [`Client`](Client).
///
/// # Example
///
/// ```
/// # #[cfg(feature = "tokio")]
/// # fn run () {
/// use std::time::Duration;
/// use hyper_util::client::legacy::Client;
/// use hyper_util::rt::TokioExecutor;
///
/// let client = Client::builder(TokioExecutor::new())
/// .pool_idle_timeout(Duration::from_secs(30))
/// .http2_only(true)
/// .build_http();
/// # let infer: Client<_, http_body_util::Full<bytes::Bytes>> = client;
/// # drop(infer);
/// # }
/// # fn main() {}
/// ```
#[cfg_attr(docsrs, doc(cfg(any(feature = "http1", feature = "http2"))))]
#[derive(Clone)]
pub struct Builder {
 client_config: Config,
 exec: Exec,
 #[cfg(feature = "http1")]
 h1_builder: hyper::client::conn::http1::Builder,
 #[cfg(feature = "http2")]
 h2_builder: hyper::client::conn::http2::Builder<Exec>,
 pool_config: pool::Config,
 pool_timer: Option<timer::Timer>,
}

impl Builder {
 /// Construct a new Builder.
 pub fn new<E>(executor: E) -> Self
 where
 E: hyper::rt::Executor<BoxSendFuture> + Send + Sync + Clone + 'static,
 {
 let exec = Exec::new(executor);
 Self {
 client_config: Config {
 retry_canceled_requests: true,
 set_host: true,
 ver: Ver::Auto,
 },
 exec: exec.clone(),
 #[cfg(feature = "http1")]
 h1_builder: hyper::client::conn::http1::Builder::new(),
 #[cfg(feature = "http2")]
 h2_builder: hyper::client::conn::http2::Builder::new(exec),
 pool_config: pool::Config {
 idle_timeout: Some(Duration::from_secs(90)),
 max_idle_per_host: usize::MAX,
 },
 pool_timer: None,
 }
 }
 /// Set an optional timeout for idle sockets being kept-alive.
 /// A `Timer` is required for this to take effect. See `Builder::pool_timer`
 ///
 /// Pass `None` to disable timeout.
 ///
 /// Default is 90 seconds.
 ///
 /// # Example
 ///
 /// ```
 /// # #[cfg(feature = "tokio")]
 /// # fn run () {
 /// use std::time::Duration;
 /// use hyper_util::client::legacy::Client;
 /// use hyper_util::rt::{TokioExecutor, TokioTimer};
 ///
 /// let client = Client::builder(TokioExecutor::new())
 /// .pool_idle_timeout(Duration::from_secs(30))
 /// .pool_timer(TokioTimer::new())
 /// .build_http();
 ///
 /// # let infer: Client<_, http_body_util::Full<bytes::Bytes>> = client;
 /// # }
 /// # fn main() {}
 /// ```
 pub fn pool_idle_timeout<D>(&mut self, val: D) -> &mut Self
 where
 D: Into<Option<Duration>>,
 {
 self.pool_config.idle_timeout = val.into();
 self
 }

 #[doc(hidden)]
 #[deprecated(note = "renamed to `pool_max_idle_per_host`")]
 pub fn max_idle_per_host(&mut self, max_idle: usize) -> &='color:red'>mut Self {
 self.pool_config.max_idle_per_host = max_idle;
 self
 }

 /// Sets the maximum idle connection per host allowed in the pool.
 ///
 /// Default is `usize::MAX` (no limit).
 pub fn pool_max_idle_per_host(&mut self, max_idle: usize) -> &style='color:red'>mut Self {
 self.pool_config.max_idle_per_host = max_idle;
 self
 }

 // HTTP/1 options

 /// Sets the exact size of the read buffer to *always* use.
 ///
 /// Note that setting this option unsets the `http1_max_buf_size` option.
 ///
 /// Default is an adaptive read buffer.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_read_buf_exact_size(&mut self, sz: usize) -> &le='color:red'>mut Self {
 self.h1_builder.read_buf_exact_size(Some(sz));
 self
 }

 /// Set the maximum buffer size for the connection.
 ///
 /// Default is ~400kb.
 ///
 /// Note that setting this option unsets the `http1_read_exact_buf_size` option.
 ///
 /// # Panics
 ///
 /// The minimum value allowed is 8192. This method panics if the passed `max` is less than the minimum.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_max_buf_size(&mut self, max: usize) -> &mut Self {
 self.h1_builder.max_buf_size(max);
 self
 }

 /// Set whether HTTP/1 connections will accept spaces between header names
 /// and the colon that follow them in responses.
 ///
 /// Newline codepoints (`\r` and `\n`) will be transformed to spaces when
 /// parsing.
 ///
 /// You probably don't need this, here is what [RFC 7230 Section 3.2.4.] has
 /// to say about it:
 ///
 /// > No whitespace is allowed between the header field-name and colon. In
 /// > the past, differences in the handling of such whitespace have led to
 /// > security vulnerabilities in request routing and response handling. A
 /// > server MUST reject any received request message that contains
 /// > whitespace between a header field-name and colon with a response code
 /// > of 400 (Bad Request). A proxy MUST remove any such whitespace from a
 /// > response message before forwarding the message downstream.
 ///
 /// Note that this setting does not affect HTTP/2.
 ///
 /// Default is false.
 ///
 /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_allow_spaces_after_header_name_in_responses(&mut self, val: bool) -> &mut Self {
 self.h1_builder
 .allow_spaces_after_header_name_in_responses(val);
 self
 }

 /// Set whether HTTP/1 connections will accept obsolete line folding for
 /// header values.
 ///
 /// You probably don't need this, here is what [RFC 7230 Section 3.2.4.] has
 /// to say about it:
 ///
 /// > A server that receives an obs-fold in a request message that is not
 /// > within a message/http container MUST either reject the message by
 /// > sending a 400 (Bad Request), preferably with a representation
 /// > explaining that obsolete line folding is unacceptable, or replace
 /// > each received obs-fold with one or more SP octets prior to
 /// > interpreting the field value or forwarding the message downstream.
 ///
 /// > A proxy or gateway that receives an obs-fold in a response message
 /// > that is not within a message/http container MUST either discard the
 /// > message and replace it with a 502 (Bad Gateway) response, preferably
 /// > with a representation explaining that unacceptable line folding was
 /// > received, or replace each received obs-fold with one or more SP
 /// > octets prior to interpreting the field value or forwarding the
 /// > message downstream.
 ///
 /// > A user agent that receives an obs-fold in a response message that is
 /// > not within a message/http container MUST replace each received
 /// > obs-fold with one or more SP octets prior to interpreting the field
 /// > value.
 ///
 /// Note that this setting does not affect HTTP/2.
 ///
 /// Default is false.
 ///
 /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_allow_obsolete_multiline_headers_in_responses(&mut self, val: bool) -> &mut Self {
 self.h1_builder
 .allow_obsolete_multiline_headers_in_responses(val);
 self
 }

 /// Sets whether invalid header lines should be silently ignored in HTTP/1 responses.
 ///
 /// This mimics the behaviour of major browsers. You probably don't want this.
 /// You should only want this if you are implementing a proxy whose main
 /// purpose is to sit in front of browsers whose users access arbitrary content
 /// which may be malformed, and they expect everything that works without
 /// the proxy to keep working with the proxy.
 ///
 /// This option will prevent Hyper's client from returning an error encountered
 /// when parsing a header, except if the error was caused by the character NUL
 /// (ASCII code 0), as Chrome specifically always reject those.
 ///
 /// The ignorable errors are:
 /// * empty header names;
 /// * characters that are not allowed in header names, except for `\0` and `\r`;
 /// * when `allow_spaces_after_header_name_in_responses` is not enabled,
 /// spaces and tabs between the header name and the colon;
 /// * missing colon between header name and colon;
 /// * characters that are not allowed in header values except for `\0` and `\r`.
 ///
 /// If an ignorable error is encountered, the parser tries to find the next
 /// line in the input to resume parsing the rest of the headers. An error
 /// will be emitted nonetheless if it finds `\0` or a lone `\r` while
 /// looking for the next line.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_ignore_invalid_headers_in_responses(&mut self, val: bool) -> &mut Builder {
 self.h1_builder.ignore_invalid_headers_in_responses(val);
 self
 }

 /// Set whether HTTP/1 connections should try to use vectored writes,
 /// or always flatten into a single buffer.
 ///
 /// Note that setting this to false may mean more copies of body data,
 /// but may also improve performance when an IO transport doesn't
 /// support vectored writes well, such as most TLS implementations.
 ///
 /// Setting this to true will force hyper to use queued strategy
 /// which may eliminate unnecessary cloning on some TLS backends
 ///
 /// Default is `auto`. In this mode hyper will try to guess which
 /// mode to use
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_writev(&mut self, enabled: bool) -> &mut Builder {
 self.h1_builder.writev(enabled);
 self
 }

 /// Set whether HTTP/1 connections will write header names as title case at
 /// the socket level.
 ///
 /// Note that this setting does not affect HTTP/2.
 ///
 /// Default is false.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_title_case_headers(&mut self, val: bool) -> &e='color:red'>mut Self {
 self.h1_builder.title_case_headers(val);
 self
 }

 /// Set whether to support preserving original header cases.
 ///
 /// Currently, this will record the original cases received, and store them
 /// in a private extension on the `Response`. It will also look for and use
 /// such an extension in any provided `Request`.
 ///
 /// Since the relevant extension is still private, there is no way to
 /// interact with the original cases. The only effect this can have now is
 /// to forward the cases in a proxy-like fashion.
 ///
 /// Note that this setting does not affect HTTP/2.
 ///
 /// Default is false.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_preserve_header_case(&mut self, val: bool) -> &yle='color:red'>mut Self {
 self.h1_builder.preserve_header_case(val);
 self
 }

 /// Set the maximum number of headers.
 ///
 /// When a response is received, the parser will reserve a buffer to store headers for optimal
 /// performance.
 ///
 /// If client receives more headers than the buffer size, the error "message header too large"
 /// is returned.
 ///
 /// The headers is allocated on the stack by default, which has higher performance. After
 /// setting this value, headers will be allocated in heap memory, that is, heap memory
 /// allocation will occur for each response, and there will be a performance drop of about 5%.
 ///
 /// Note that this setting does not affect HTTP/2.
 ///
 /// Default is 100.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http1_max_headers(&mut self, val: usize) -> &mut Self {
 self.h1_builder.max_headers(val);
 self
 }

 /// Set whether HTTP/0.9 responses should be tolerated.
 ///
 /// Default is false.
 #[cfg(feature = "http1")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http1")))]
 pub fn http09_responses(&mut self, val: bool) -> &mut Self {
 self.h1_builder.http09_responses(val);
 self
 }

 /// Set whether the connection **must** use HTTP/2.
 ///
 /// The destination must either allow HTTP2 Prior Knowledge, or the
 /// `Connect` should be configured to do use ALPN to upgrade to `h2`
 /// as part of the connection process. This will not make the `Client`
 /// utilize ALPN by itself.
 ///
 /// Note that setting this to true prevents HTTP/1 from being allowed.
 ///
 /// Default is false.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_only(&mut self, val: bool) -> &mut Self {
 self.client_config.ver = if val { Ver::Http2 } else { Ver::Auto };
 self
 }

 /// Configures the maximum number of pending reset streams allowed before a GOAWAY will be sent.
 ///
 /// This will default to the default value set by the [`h2` crate](https://crates.io/crates/h2).
 /// As of v0.4.0, it is 20.
 ///
 /// See <https://github.com/hyperium/hyper/issues/2877> for more information.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_max_pending_accept_reset_streams(
 &mut self,
 max: impl Into<Option<usize>>,
 ) -> &mut Self {
 self.h2_builder.max_pending_accept_reset_streams(max.into());
 self
 }

 /// Sets the [`SETTINGS_INITIAL_WINDOW_SIZE`][spec] option for HTTP2
 /// stream-level flow control.
 ///
 /// Passing `None` will do nothing.
 ///
 /// If not set, hyper will use a default.
 ///
 /// [spec]: https://http2.github.io/http2-spec/#SETTINGS_INITIAL_WINDOW_SIZE
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_initial_stream_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
 self.h2_builder.initial_stream_window_size(sz.into());
 self
 }

 /// Sets the max connection-level flow control for HTTP2
 ///
 /// Passing `None` will do nothing.
 ///
 /// If not set, hyper will use a default.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_initial_connection_window_size(
 &mut self,
 sz: impl Into<Option<u32>>,
 ) -> &mut Self {
 self.h2_builder.initial_connection_window_size(sz.into());
 self
 }

 /// Sets the initial maximum of locally initiated (send) streams.
 ///
 /// This value will be overwritten by the value included in the initial
 /// SETTINGS frame received from the peer as part of a [connection preface].
 ///
 /// Passing `None` will do nothing.
 ///
 /// If not set, hyper will use a default.
 ///
 /// [connection preface]: https://httpwg.org/specs/rfc9113.html#preface
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_initial_max_send_streams(
 &mut self,
 initial: impl Into<Option<usize>>,
 ) -> &mut Self {
 self.h2_builder.initial_max_send_streams(initial);
 self
 }

 /// Sets whether to use an adaptive flow control.
 ///
 /// Enabling this will override the limits set in
 /// `http2_initial_stream_window_size` and
 /// `http2_initial_connection_window_size`.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_adaptive_window(&mut self, enabled: bool) -> &le='color:red'>mut Self {
 self.h2_builder.adaptive_window(enabled);
 self
 }

 /// Sets the maximum frame size to use for HTTP2.
 ///
 /// Passing `None` will do nothing.
 ///
 /// If not set, hyper will use a default.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_max_frame_size(&mut self, sz: impl Into<Option<u32>>) -> &pan style='color:red'>mut Self {
 self.h2_builder.max_frame_size(sz);
 self
 }

 /// Sets the max size of received header frames for HTTP2.
 ///
 /// Default is currently 16KB, but can change.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_max_header_list_size(&mut self, max: u32) -> &le='color:red'>mut Self {
 self.h2_builder.max_header_list_size(max);
 self
 }

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

 /// Sets a timeout for receiving an acknowledgement of the keep-alive ping.
 ///
 /// If the ping is not acknowledged within the timeout, the connection will
 /// be closed. Does nothing if `http2_keep_alive_interval` is disabled.
 ///
 /// Default is 20 seconds.
 ///
 /// # Cargo Feature
 ///
 /// Requires the `tokio` cargo feature to be enabled.
 #[cfg(feature = "tokio")]
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_keep_alive_timeout(&mut self, timeout: Duration) -> &pan style='color:red'>mut Self {
 self.h2_builder.keep_alive_timeout(timeout);
 self
 }

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

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

 /// Provide a timer to be used for h2
 ///
 /// See the documentation of [`h2::client::Builder::timer`] for more
 /// details.
 ///
 /// [`h2::client::Builder::timer`]: https://docs.rs/h2/client/struct.Builder.html#method.timer
 pub fn timer<M>(&mut self, timer: M) -> &mut Self
 where
 M: Timer + Send + Sync + 'static,
 {
 #[cfg(feature = "http2")]
 self.h2_builder.timer(timer);
 self
 }

 /// Provide a timer to be used for timeouts and intervals in connection pools.
 pub fn pool_timer<M>(&mut self, timer: M) -> &mut Self
 where
 M: Timer + Clone + Send + Sync + 'static,
 {
 self.pool_timer = Some(timer::Timer::new(timer.clone()));
 self
 }

 /// Set the maximum write buffer size for each HTTP/2 stream.
 ///
 /// Default is currently 1MB, but may change.
 ///
 /// # Panics
 ///
 /// The value must be no larger than `u32::MAX`.
 #[cfg(feature = "http2")]
 #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
 pub fn http2_max_send_buf_size(&mut self, max: usize) -> &e='color:red'>mut Self {
 self.h2_builder.max_send_buf_size(max);
 self
 }

 /// Set whether to retry requests that get disrupted before ever starting
 /// to write.
 ///
 /// This means a request that is queued, and gets given an idle, reused
 /// connection, and then encounters an error immediately as the idle
 /// connection was found to be unusable.
 ///
 /// When this is set to `false`, the related `ResponseFuture` would instead
 /// resolve to an `Error::Cancel`.
 ///
 /// Default is `true`.
 #[inline]
 pub fn retry_canceled_requests(&mut self, val: bool) -> &='color:red'>mut Self {
 self.client_config.retry_canceled_requests = val;
 self
 }

 /// Set whether to automatically add the `Host` header to requests.
 ///
 /// If true, and a request does not include a `Host` header, one will be
 /// added automatically, derived from the authority of the `Uri`.
 ///
 /// Default is `true`.
 #[inline]
 pub fn set_host(&mut self, val: bool) -> &mut Self {
 self.client_config.set_host = val;
 self
 }

 /// Build a client with this configuration and the default `HttpConnector`.
 #[cfg(feature = "tokio")]
 pub fn build_http(&self) -> Client<HttpConnector, B>
 where
 B: Body + Send,
 B::Data: Send,
 {
 let mut connector = HttpConnector::new();
 if self.pool_config.is_enabled() {
 connector.set_keepalive(self.pool_config.idle_timeout);
 }
 self.build(connector)
 }

 /// Combine the configuration of this builder with a connector to create a `Client`.
 pub fn build<C, B>(&self, connector: C) -> Client<C, B>
 where
 C: Connect + Clone,
 B: Body + Send,
 B::Data: Send,
 {
 let exec = self.exec.clone();
 let timer = self.pool_timer.clone();
 Client {
 config: self.client_config,
 exec: exec.clone(),
 #[cfg(feature = "http1")]
 h1_builder: self.h1_builder.clone(),
 #[cfg(feature = "http2")]
 h2_builder: self.h2_builder.clone(),
 connector,
 pool: pool::Pool::new(self.pool_config, exec, timer),
 }
 }
}

impl fmt::Debug for Builder {
 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 f.debug_struct("Builder")
 .field("client_config", &self.client_config)
 .field("pool_config", &self.pool_config)
 .finish()
 }
}

// ==== impl Error ====

impl fmt::Debug for Error {
 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 let mut f = f.debug_tuple("hyper_util::client::legacy::Error");
 f.field(&self.kind);
 if let Some(ref cause) = self.source {
 f.field(cause);
 }
 f.finish()
 }
}

impl fmt::Display for Error {
 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 write!(f, "client error ({:?})", self.kind)
 }
}

impl StdError for Error {
 fn source(&self) -> Option<&(dyn StdError + 'static)> {
 self.source.as_ref().map(|e| &**e as _)
 }
}

impl Error {
 /// Returns true if this was an error from `Connect`.
 pub fn is_connect(&self) -> bool {
 matches!(self.kind, ErrorKind::Connect)
 }

 /// Returns the info of the client connection on which this error occurred.
 #[cfg(any(feature = "http1", feature = "http2"))]
 pub fn connect_info(&self) -> Option<&Connected> {
 self.connect_info.as_ref()
 }

 #[cfg(any(feature = "http1", feature = "http2"))]
 fn with_connect_info(self, connect_info: Connected) -> Self {
 Self {
 connect_info: Some(connect_info),
 ..self
 }
 }
 fn is_canceled(&self) -> bool {
 matches!(self.kind, ErrorKind::Canceled)
 }

 fn tx(src: hyper::Error) -> Self {
 e!(SendRequest, src)
 }

 fn closed(src: hyper::Error) -> Self {
 e!(ChannelClosed, src)
 }
}

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