chore: add vendor directory

4 files changed, 2249 insertions, 0 deletions

diff --git a/vendor/hyper/src/proto/h2/client.rs b/vendor/hyper/src/proto/h2/client.rs
new file mode 100644
index 00000000..5e9641e4
--- /dev/null
+++ b/vendor/hyper/src/proto/h2/client.rs
@@ -0,0 +1,749 @@
+use std::{
+    convert::Infallible,
+    future::Future,
+    marker::PhantomData,
+    pin::Pin,
+    task::{Context, Poll},
+    time::Duration,
+};
+
+use crate::rt::{Read, Write};
+use bytes::Bytes;
+use futures_channel::mpsc::{Receiver, Sender};
+use futures_channel::{mpsc, oneshot};
+use futures_util::future::{Either, FusedFuture, FutureExt as _};
+use futures_util::ready;
+use futures_util::stream::{StreamExt as _, StreamFuture};
+use h2::client::{Builder, Connection, SendRequest};
+use h2::SendStream;
+use http::{Method, StatusCode};
+use pin_project_lite::pin_project;
+
+use super::ping::{Ponger, Recorder};
+use super::{ping, H2Upgraded, PipeToSendStream, SendBuf};
+use crate::body::{Body, Incoming as IncomingBody};
+use crate::client::dispatch::{Callback, SendWhen, TrySendError};
+use crate::common::io::Compat;
+use crate::common::time::Time;
+use crate::ext::Protocol;
+use crate::headers;
+use crate::proto::h2::UpgradedSendStream;
+use crate::proto::Dispatched;
+use crate::rt::bounds::Http2ClientConnExec;
+use crate::upgrade::Upgraded;
+use crate::{Request, Response};
+use h2::client::ResponseFuture;
+
+type ClientRx<B> = crate::client::dispatch::Receiver<Request<B>, Response<IncomingBody>>;
+
+///// An mpsc channel is used to help notify the `Connection` task when *all*
+///// other handles to it have been dropped, so that it can shutdown.
+type ConnDropRef = mpsc::Sender<Infallible>;
+
+///// A oneshot channel watches the `Connection` task, and when it completes,
+///// the "dispatch" task will be notified and can shutdown sooner.
+type ConnEof = oneshot::Receiver<Infallible>;
+
+// Our defaults are chosen for the "majority" case, which usually are not
+// resource constrained, and so the spec default of 64kb can be too limiting
+// for performance.
+const DEFAULT_CONN_WINDOW: u32 = 1024 * 1024 * 5; // 5mb
+const DEFAULT_STREAM_WINDOW: u32 = 1024 * 1024 * 2; // 2mb
+const DEFAULT_MAX_FRAME_SIZE: u32 = 1024 * 16; // 16kb
+const DEFAULT_MAX_SEND_BUF_SIZE: usize = 1024 * 1024; // 1mb
+const DEFAULT_MAX_HEADER_LIST_SIZE: u32 = 1024 * 16; // 16kb
+
+// The maximum number of concurrent streams that the client is allowed to open
+// before it receives the initial SETTINGS frame from the server.
+// This default value is derived from what the HTTP/2 spec recommends as the
+// minimum value that endpoints advertise to their peers. It means that using
+// this value will minimize the chance of the failure where the local endpoint
+// attempts to open too many streams and gets rejected by the remote peer with
+// the `REFUSED_STREAM` error.
+const DEFAULT_INITIAL_MAX_SEND_STREAMS: usize = 100;
+
+#[derive(Clone, Debug)]
+pub(crate) struct Config {
+    pub(crate) adaptive_window: bool,
+    pub(crate) initial_conn_window_size: u32,
+    pub(crate) initial_stream_window_size: u32,
+    pub(crate) initial_max_send_streams: usize,
+    pub(crate) max_frame_size: Option<u32>,
+    pub(crate) max_header_list_size: u32,
+    pub(crate) keep_alive_interval: Option<Duration>,
+    pub(crate) keep_alive_timeout: Duration,
+    pub(crate) keep_alive_while_idle: bool,
+    pub(crate) max_concurrent_reset_streams: Option<usize>,
+    pub(crate) max_send_buffer_size: usize,
+    pub(crate) max_pending_accept_reset_streams: Option<usize>,
+    pub(crate) header_table_size: Option<u32>,
+    pub(crate) max_concurrent_streams: Option<u32>,
+}
+
+impl Default for Config {
+    fn default() -> Config {
+        Config {
+            adaptive_window: false,
+            initial_conn_window_size: DEFAULT_CONN_WINDOW,
+            initial_stream_window_size: DEFAULT_STREAM_WINDOW,
+            initial_max_send_streams: DEFAULT_INITIAL_MAX_SEND_STREAMS,
+            max_frame_size: Some(DEFAULT_MAX_FRAME_SIZE),
+            max_header_list_size: DEFAULT_MAX_HEADER_LIST_SIZE,
+            keep_alive_interval: None,
+            keep_alive_timeout: Duration::from_secs(20),
+            keep_alive_while_idle: false,
+            max_concurrent_reset_streams: None,
+            max_send_buffer_size: DEFAULT_MAX_SEND_BUF_SIZE,
+            max_pending_accept_reset_streams: None,
+            header_table_size: None,
+            max_concurrent_streams: None,
+        }
+    }
+}
+
+fn new_builder(config: &Config) -> Builder {
+    let mut builder = Builder::default();
+    builder
+        .initial_max_send_streams(config.initial_max_send_streams)
+        .initial_window_size(config.initial_stream_window_size)
+        .initial_connection_window_size(config.initial_conn_window_size)
+        .max_header_list_size(config.max_header_list_size)
+        .max_send_buffer_size(config.max_send_buffer_size)
+        .enable_push(false);
+    if let Some(max) = config.max_frame_size {
+        builder.max_frame_size(max);
+    }
+    if let Some(max) = config.max_concurrent_reset_streams {
+        builder.max_concurrent_reset_streams(max);
+    }
+    if let Some(max) = config.max_pending_accept_reset_streams {
+        builder.max_pending_accept_reset_streams(max);
+    }
+    if let Some(size) = config.header_table_size {
+        builder.header_table_size(size);
+    }
+    if let Some(max) = config.max_concurrent_streams {
+        builder.max_concurrent_streams(max);
+    }
+    builder
+}
+
+fn new_ping_config(config: &Config) -> ping::Config {
+    ping::Config {
+        bdp_initial_window: if config.adaptive_window {
+            Some(config.initial_stream_window_size)
+        } else {
+            None
+        },
+        keep_alive_interval: config.keep_alive_interval,
+        keep_alive_timeout: config.keep_alive_timeout,
+        keep_alive_while_idle: config.keep_alive_while_idle,
+    }
+}
+
+pub(crate) async fn handshake<T, B, E>(
+    io: T,
+    req_rx: ClientRx<B>,
+    config: &Config,
+    mut exec: E,
+    timer: Time,
+) -> crate::Result<ClientTask<B, E, T>>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    B::Data: Send + 'static,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    let (h2_tx, mut conn) = new_builder(config)
+        .handshake::<_, SendBuf<B::Data>>(Compat::new(io))
+        .await
+        .map_err(crate::Error::new_h2)?;
+
+    // An mpsc channel is used entirely to detect when the
+    // 'Client' has been dropped. This is to get around a bug
+    // in h2 where dropping all SendRequests won't notify a
+    // parked Connection.
+    let (conn_drop_ref, rx) = mpsc::channel(1);
+    let (cancel_tx, conn_eof) = oneshot::channel();
+
+    let conn_drop_rx = rx.into_future();
+
+    let ping_config = new_ping_config(config);
+
+    let (conn, ping) = if ping_config.is_enabled() {
+        let pp = conn.ping_pong().expect("conn.ping_pong");
+        let (recorder, ponger) = ping::channel(pp, ping_config, timer);
+
+        let conn: Conn<_, B> = Conn::new(ponger, conn);
+        (Either::Left(conn), recorder)
+    } else {
+        (Either::Right(conn), ping::disabled())
+    };
+    let conn: ConnMapErr<T, B> = ConnMapErr {
+        conn,
+        is_terminated: false,
+    };
+
+    exec.execute_h2_future(H2ClientFuture::Task {
+        task: ConnTask::new(conn, conn_drop_rx, cancel_tx),
+    });
+
+    Ok(ClientTask {
+        ping,
+        conn_drop_ref,
+        conn_eof,
+        executor: exec,
+        h2_tx,
+        req_rx,
+        fut_ctx: None,
+        marker: PhantomData,
+    })
+}
+
+pin_project! {
+    struct Conn<T, B>
+    where
+        B: Body,
+    {
+        #[pin]
+        ponger: Ponger,
+        #[pin]
+        conn: Connection<Compat<T>, SendBuf<<B as Body>::Data>>,
+    }
+}
+
+impl<T, B> Conn<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    fn new(ponger: Ponger, conn: Connection<Compat<T>, SendBuf<<B as Body>::Data>>) -> Self {
+        Conn { ponger, conn }
+    }
+}
+
+impl<T, B> Future for Conn<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    type Output = Result<(), h2::Error>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+        match this.ponger.poll(cx) {
+            Poll::Ready(ping::Ponged::SizeUpdate(wnd)) => {
+                this.conn.set_target_window_size(wnd);
+                this.conn.set_initial_window_size(wnd)?;
+            }
+            Poll::Ready(ping::Ponged::KeepAliveTimedOut) => {
+                debug!("connection keep-alive timed out");
+                return Poll::Ready(Ok(()));
+            }
+            Poll::Pending => {}
+        }
+
+        Pin::new(&mut this.conn).poll(cx)
+    }
+}
+
+pin_project! {
+    struct ConnMapErr<T, B>
+    where
+        B: Body,
+        T: Read,
+        T: Write,
+        T: Unpin,
+    {
+        #[pin]
+        conn: Either<Conn<T, B>, Connection<Compat<T>, SendBuf<<B as Body>::Data>>>,
+        #[pin]
+        is_terminated: bool,
+    }
+}
+
+impl<T, B> Future for ConnMapErr<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    type Output = Result<(), ()>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+
+        if *this.is_terminated {
+            return Poll::Pending;
+        }
+        let polled = this.conn.poll(cx);
+        if polled.is_ready() {
+            *this.is_terminated = true;
+        }
+        polled.map_err(|_e| {
+            debug!(error = %_e, "connection error");
+        })
+    }
+}
+
+impl<T, B> FusedFuture for ConnMapErr<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    fn is_terminated(&self) -> bool {
+        self.is_terminated
+    }
+}
+
+pin_project! {
+    pub struct ConnTask<T, B>
+    where
+        B: Body,
+        T: Read,
+        T: Write,
+        T: Unpin,
+    {
+        #[pin]
+        drop_rx: StreamFuture<Receiver<Infallible>>,
+        #[pin]
+        cancel_tx: Option<oneshot::Sender<Infallible>>,
+        #[pin]
+        conn: ConnMapErr<T, B>,
+    }
+}
+
+impl<T, B> ConnTask<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    fn new(
+        conn: ConnMapErr<T, B>,
+        drop_rx: StreamFuture<Receiver<Infallible>>,
+        cancel_tx: oneshot::Sender<Infallible>,
+    ) -> Self {
+        Self {
+            drop_rx,
+            cancel_tx: Some(cancel_tx),
+            conn,
+        }
+    }
+}
+
+impl<T, B> Future for ConnTask<T, B>
+where
+    B: Body,
+    T: Read + Write + Unpin,
+{
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+
+        if !this.conn.is_terminated() && this.conn.poll_unpin(cx).is_ready() {
+            // ok or err, the `conn` has finished.
+            return Poll::Ready(());
+        }
+
+        if !this.drop_rx.is_terminated() && this.drop_rx.poll_unpin(cx).is_ready() {
+            // mpsc has been dropped, hopefully polling
+            // the connection some more should start shutdown
+            // and then close.
+            trace!("send_request dropped, starting conn shutdown");
+            drop(this.cancel_tx.take().expect("ConnTask Future polled twice"));
+        }
+
+        Poll::Pending
+    }
+}
+
+pin_project! {
+    #[project = H2ClientFutureProject]
+    pub enum H2ClientFuture<B, T>
+    where
+        B: http_body::Body,
+        B: 'static,
+        B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+        T: Read,
+        T: Write,
+        T: Unpin,
+    {
+        Pipe {
+            #[pin]
+            pipe: PipeMap<B>,
+        },
+        Send {
+            #[pin]
+            send_when: SendWhen<B>,
+        },
+        Task {
+            #[pin]
+            task: ConnTask<T, B>,
+        },
+    }
+}
+
+impl<B, T> Future for H2ClientFuture<B, T>
+where
+    B: http_body::Body + 'static,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+    T: Read + Write + Unpin,
+{
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> std::task::Poll<Self::Output> {
+        let this = self.project();
+
+        match this {
+            H2ClientFutureProject::Pipe { pipe } => pipe.poll(cx),
+            H2ClientFutureProject::Send { send_when } => send_when.poll(cx),
+            H2ClientFutureProject::Task { task } => task.poll(cx),
+        }
+    }
+}
+
+struct FutCtx<B>
+where
+    B: Body,
+{
+    is_connect: bool,
+    eos: bool,
+    fut: ResponseFuture,
+    body_tx: SendStream<SendBuf<B::Data>>,
+    body: B,
+    cb: Callback<Request<B>, Response<IncomingBody>>,
+}
+
+impl<B: Body> Unpin for FutCtx<B> {}
+
+pub(crate) struct ClientTask<B, E, T>
+where
+    B: Body,
+    E: Unpin,
+{
+    ping: ping::Recorder,
+    conn_drop_ref: ConnDropRef,
+    conn_eof: ConnEof,
+    executor: E,
+    h2_tx: SendRequest<SendBuf<B::Data>>,
+    req_rx: ClientRx<B>,
+    fut_ctx: Option<FutCtx<B>>,
+    marker: PhantomData<T>,
+}
+
+impl<B, E, T> ClientTask<B, E, T>
+where
+    B: Body + 'static,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+    T: Read + Write + Unpin,
+{
+    pub(crate) fn is_extended_connect_protocol_enabled(&self) -> bool {
+        self.h2_tx.is_extended_connect_protocol_enabled()
+    }
+}
+
+pin_project! {
+    pub struct PipeMap<S>
+    where
+        S: Body,
+    {
+        #[pin]
+        pipe: PipeToSendStream<S>,
+        #[pin]
+        conn_drop_ref: Option<Sender<Infallible>>,
+        #[pin]
+        ping: Option<Recorder>,
+    }
+}
+
+impl<B> Future for PipeMap<B>
+where
+    B: http_body::Body,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+{
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> std::task::Poll<Self::Output> {
+        let mut this = self.project();
+
+        match this.pipe.poll_unpin(cx) {
+            Poll::Ready(result) => {
+                if let Err(_e) = result {
+                    debug!("client request body error: {}", _e);
+                }
+                drop(this.conn_drop_ref.take().expect("Future polled twice"));
+                drop(this.ping.take().expect("Future polled twice"));
+                return Poll::Ready(());
+            }
+            Poll::Pending => (),
+        };
+        Poll::Pending
+    }
+}
+
+impl<B, E, T> ClientTask<B, E, T>
+where
+    B: Body + 'static + Unpin,
+    B::Data: Send,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+    T: Read + Write + Unpin,
+{
+    fn poll_pipe(&mut self, f: FutCtx<B>, cx: &mut Context<'_>) {
+        let ping = self.ping.clone();
+
+        let send_stream = if !f.is_connect {
+            if !f.eos {
+                let mut pipe = PipeToSendStream::new(f.body, f.body_tx);
+
+                // eagerly see if the body pipe is ready and
+                // can thus skip allocating in the executor
+                match Pin::new(&mut pipe).poll(cx) {
+                    Poll::Ready(_) => (),
+                    Poll::Pending => {
+                        let conn_drop_ref = self.conn_drop_ref.clone();
+                        // keep the ping recorder's knowledge of an
+                        // "open stream" alive while this body is
+                        // still sending...
+                        let ping = ping.clone();
+
+                        let pipe = PipeMap {
+                            pipe,
+                            conn_drop_ref: Some(conn_drop_ref),
+                            ping: Some(ping),
+                        };
+                        // Clear send task
+                        self.executor
+                            .execute_h2_future(H2ClientFuture::Pipe { pipe });
+                    }
+                }
+            }
+
+            None
+        } else {
+            Some(f.body_tx)
+        };
+
+        self.executor.execute_h2_future(H2ClientFuture::Send {
+            send_when: SendWhen {
+                when: ResponseFutMap {
+                    fut: f.fut,
+                    ping: Some(ping),
+                    send_stream: Some(send_stream),
+                },
+                call_back: Some(f.cb),
+            },
+        });
+    }
+}
+
+pin_project! {
+    pub(crate) struct ResponseFutMap<B>
+    where
+        B: Body,
+        B: 'static,
+    {
+        #[pin]
+        fut: ResponseFuture,
+        #[pin]
+        ping: Option<Recorder>,
+        #[pin]
+        send_stream: Option<Option<SendStream<SendBuf<<B as Body>::Data>>>>,
+    }
+}
+
+impl<B> Future for ResponseFutMap<B>
+where
+    B: Body + 'static,
+{
+    type Output = Result<Response<crate::body::Incoming>, (crate::Error, Option<Request<B>>)>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+
+        let result = ready!(this.fut.poll(cx));
+
+        let ping = this.ping.take().expect("Future polled twice");
+        let send_stream = this.send_stream.take().expect("Future polled twice");
+
+        match result {
+            Ok(res) => {
+                // record that we got the response headers
+                ping.record_non_data();
+
+                let content_length = headers::content_length_parse_all(res.headers());
+                if let (Some(mut send_stream), StatusCode::OK) = (send_stream, res.status()) {
+                    if content_length.map_or(false, |len| len != 0) {
+                        warn!("h2 connect response with non-zero body not supported");
+
+                        send_stream.send_reset(h2::Reason::INTERNAL_ERROR);
+                        return Poll::Ready(Err((
+                            crate::Error::new_h2(h2::Reason::INTERNAL_ERROR.into()),
+                            None::<Request<B>>,
+                        )));
+                    }
+                    let (parts, recv_stream) = res.into_parts();
+                    let mut res = Response::from_parts(parts, IncomingBody::empty());
+
+                    let (pending, on_upgrade) = crate::upgrade::pending();
+                    let io = H2Upgraded {
+                        ping,
+                        send_stream: unsafe { UpgradedSendStream::new(send_stream) },
+                        recv_stream,
+                        buf: Bytes::new(),
+                    };
+                    let upgraded = Upgraded::new(io, Bytes::new());
+
+                    pending.fulfill(upgraded);
+                    res.extensions_mut().insert(on_upgrade);
+
+                    Poll::Ready(Ok(res))
+                } else {
+                    let res = res.map(|stream| {
+                        let ping = ping.for_stream(&stream);
+                        IncomingBody::h2(stream, content_length.into(), ping)
+                    });
+                    Poll::Ready(Ok(res))
+                }
+            }
+            Err(err) => {
+                ping.ensure_not_timed_out().map_err(|e| (e, None))?;
+
+                debug!("client response error: {}", err);
+                Poll::Ready(Err((crate::Error::new_h2(err), None::<Request<B>>)))
+            }
+        }
+    }
+}
+
+impl<B, E, T> Future for ClientTask<B, E, T>
+where
+    B: Body + 'static + Unpin,
+    B::Data: Send,
+    B::Error: Into<Box<dyn std::error::Error + Send + Sync>>,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    T: Read + Write + Unpin,
+{
+    type Output = crate::Result<Dispatched>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        loop {
+            match ready!(self.h2_tx.poll_ready(cx)) {
+                Ok(()) => (),
+                Err(err) => {
+                    self.ping.ensure_not_timed_out()?;
+                    return if err.reason() == Some(::h2::Reason::NO_ERROR) {
+                        trace!("connection gracefully shutdown");
+                        Poll::Ready(Ok(Dispatched::Shutdown))
+                    } else {
+                        Poll::Ready(Err(crate::Error::new_h2(err)))
+                    };
+                }
+            };
+
+            // If we were waiting on pending open
+            // continue where we left off.
+            if let Some(f) = self.fut_ctx.take() {
+                self.poll_pipe(f, cx);
+                continue;
+            }
+
+            match self.req_rx.poll_recv(cx) {
+                Poll::Ready(Some((req, cb))) => {
+                    // check that future hasn't been canceled already
+                    if cb.is_canceled() {
+                        trace!("request callback is canceled");
+                        continue;
+                    }
+                    let (head, body) = req.into_parts();
+                    let mut req = ::http::Request::from_parts(head, ());
+                    super::strip_connection_headers(req.headers_mut(), true);
+                    if let Some(len) = body.size_hint().exact() {
+                        if len != 0 || headers::method_has_defined_payload_semantics(req.method()) {
+                            headers::set_content_length_if_missing(req.headers_mut(), len);
+                        }
+                    }
+
+                    let is_connect = req.method() == Method::CONNECT;
+                    let eos = body.is_end_stream();
+
+                    if is_connect
+                        && headers::content_length_parse_all(req.headers())
+                            .map_or(false, |len| len != 0)
+                    {
+                        warn!("h2 connect request with non-zero body not supported");
+                        cb.send(Err(TrySendError {
+                            error: crate::Error::new_h2(h2::Reason::INTERNAL_ERROR.into()),
+                            message: None,
+                        }));
+                        continue;
+                    }
+
+                    if let Some(protocol) = req.extensions_mut().remove::<Protocol>() {
+                        req.extensions_mut().insert(protocol.into_inner());
+                    }
+
+                    let (fut, body_tx) = match self.h2_tx.send_request(req, !is_connect && eos) {
+                        Ok(ok) => ok,
+                        Err(err) => {
+                            debug!("client send request error: {}", err);
+                            cb.send(Err(TrySendError {
+                                error: crate::Error::new_h2(err),
+                                message: None,
+                            }));
+                            continue;
+                        }
+                    };
+
+                    let f = FutCtx {
+                        is_connect,
+                        eos,
+                        fut,
+                        body_tx,
+                        body,
+                        cb,
+                    };
+
+                    // Check poll_ready() again.
+                    // If the call to send_request() resulted in the new stream being pending open
+                    // we have to wait for the open to complete before accepting new requests.
+                    match self.h2_tx.poll_ready(cx) {
+                        Poll::Pending => {
+                            // Save Context
+                            self.fut_ctx = Some(f);
+                            return Poll::Pending;
+                        }
+                        Poll::Ready(Ok(())) => (),
+                        Poll::Ready(Err(err)) => {
+                            f.cb.send(Err(TrySendError {
+                                error: crate::Error::new_h2(err),
+                                message: None,
+                            }));
+                            continue;
+                        }
+                    }
+                    self.poll_pipe(f, cx);
+                    continue;
+                }
+
+                Poll::Ready(None) => {
+                    trace!("client::dispatch::Sender dropped");
+                    return Poll::Ready(Ok(Dispatched::Shutdown));
+                }
+
+                Poll::Pending => match ready!(Pin::new(&mut self.conn_eof).poll(cx)) {
+                    // As of Rust 1.82, this pattern is no longer needed, and emits a warning.
+                    // But we cannot remove it as long as MSRV is less than that.
+                    #[allow(unused)]
+                    Ok(never) => match never {},
+                    Err(_conn_is_eof) => {
+                        trace!("connection task is closed, closing dispatch task");
+                        return Poll::Ready(Ok(Dispatched::Shutdown));
+                    }
+                },
+            }
+        }
+    }
+}
diff --git a/vendor/hyper/src/proto/h2/mod.rs b/vendor/hyper/src/proto/h2/mod.rs
new file mode 100644
index 00000000..adb6de87
--- /dev/null
+++ b/vendor/hyper/src/proto/h2/mod.rs
@@ -0,0 +1,446 @@
+use std::error::Error as StdError;
+use std::future::Future;
+use std::io::{Cursor, IoSlice};
+use std::mem;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use bytes::{Buf, Bytes};
+use futures_util::ready;
+use h2::{Reason, RecvStream, SendStream};
+use http::header::{HeaderName, CONNECTION, TE, TRANSFER_ENCODING, UPGRADE};
+use http::HeaderMap;
+use pin_project_lite::pin_project;
+
+use crate::body::Body;
+use crate::proto::h2::ping::Recorder;
+use crate::rt::{Read, ReadBufCursor, Write};
+
+pub(crate) mod ping;
+
+cfg_client! {
+    pub(crate) mod client;
+    pub(crate) use self::client::ClientTask;
+}
+
+cfg_server! {
+    pub(crate) mod server;
+    pub(crate) use self::server::Server;
+}
+
+/// Default initial stream window size defined in HTTP2 spec.
+pub(crate) const SPEC_WINDOW_SIZE: u32 = 65_535;
+
+// List of connection headers from RFC 9110 Section 7.6.1
+//
+// TE headers are allowed in HTTP/2 requests as long as the value is "trailers", so they're
+// tested separately.
+static CONNECTION_HEADERS: [HeaderName; 4] = [
+    HeaderName::from_static("keep-alive"),
+    HeaderName::from_static("proxy-connection"),
+    TRANSFER_ENCODING,
+    UPGRADE,
+];
+
+fn strip_connection_headers(headers: &mut HeaderMap, is_request: bool) {
+    for header in &CONNECTION_HEADERS {
+        if headers.remove(header).is_some() {
+            warn!("Connection header illegal in HTTP/2: {}", header.as_str());
+        }
+    }
+
+    if is_request {
+        if headers
+            .get(TE)
+            .map_or(false, |te_header| te_header != "trailers")
+        {
+            warn!("TE headers not set to \"trailers\" are illegal in HTTP/2 requests");
+            headers.remove(TE);
+        }
+    } else if headers.remove(TE).is_some() {
+        warn!("TE headers illegal in HTTP/2 responses");
+    }
+
+    if let Some(header) = headers.remove(CONNECTION) {
+        warn!(
+            "Connection header illegal in HTTP/2: {}",
+            CONNECTION.as_str()
+        );
+        let header_contents = header.to_str().unwrap();
+
+        // A `Connection` header may have a comma-separated list of names of other headers that
+        // are meant for only this specific connection.
+        //
+        // Iterate these names and remove them as headers. Connection-specific headers are
+        // forbidden in HTTP2, as that information has been moved into frame types of the h2
+        // protocol.
+        for name in header_contents.split(',') {
+            let name = name.trim();
+            headers.remove(name);
+        }
+    }
+}
+
+// body adapters used by both Client and Server
+
+pin_project! {
+    pub(crate) struct PipeToSendStream<S>
+    where
+        S: Body,
+    {
+        body_tx: SendStream<SendBuf<S::Data>>,
+        data_done: bool,
+        #[pin]
+        stream: S,
+    }
+}
+
+impl<S> PipeToSendStream<S>
+where
+    S: Body,
+{
+    fn new(stream: S, tx: SendStream<SendBuf<S::Data>>) -> PipeToSendStream<S> {
+        PipeToSendStream {
+            body_tx: tx,
+            data_done: false,
+            stream,
+        }
+    }
+}
+
+impl<S> Future for PipeToSendStream<S>
+where
+    S: Body,
+    S::Error: Into<Box<dyn StdError + Send + Sync>>,
+{
+    type Output = crate::Result<()>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut me = self.project();
+        loop {
+            // we don't have the next chunk of data yet, so just reserve 1 byte to make
+            // sure there's some capacity available. h2 will handle the capacity management
+            // for the actual body chunk.
+            me.body_tx.reserve_capacity(1);
+
+            if me.body_tx.capacity() == 0 {
+                loop {
+                    match ready!(me.body_tx.poll_capacity(cx)) {
+                        Some(Ok(0)) => {}
+                        Some(Ok(_)) => break,
+                        Some(Err(e)) => return Poll::Ready(Err(crate::Error::new_body_write(e))),
+                        None => {
+                            // None means the stream is no longer in a
+                            // streaming state, we either finished it
+                            // somehow, or the remote reset us.
+                            return Poll::Ready(Err(crate::Error::new_body_write(
+                                "send stream capacity unexpectedly closed",
+                            )));
+                        }
+                    }
+                }
+            } else if let Poll::Ready(reason) = me
+                .body_tx
+                .poll_reset(cx)
+                .map_err(crate::Error::new_body_write)?
+            {
+                debug!("stream received RST_STREAM: {:?}", reason);
+                return Poll::Ready(Err(crate::Error::new_body_write(::h2::Error::from(reason))));
+            }
+
+            match ready!(me.stream.as_mut().poll_frame(cx)) {
+                Some(Ok(frame)) => {
+                    if frame.is_data() {
+                        let chunk = frame.into_data().unwrap_or_else(|_| unreachable!());
+                        let is_eos = me.stream.is_end_stream();
+                        trace!(
+                            "send body chunk: {} bytes, eos={}",
+                            chunk.remaining(),
+                            is_eos,
+                        );
+
+                        let buf = SendBuf::Buf(chunk);
+                        me.body_tx
+                            .send_data(buf, is_eos)
+                            .map_err(crate::Error::new_body_write)?;
+
+                        if is_eos {
+                            return Poll::Ready(Ok(()));
+                        }
+                    } else if frame.is_trailers() {
+                        // no more DATA, so give any capacity back
+                        me.body_tx.reserve_capacity(0);
+                        me.body_tx
+                            .send_trailers(frame.into_trailers().unwrap_or_else(|_| unreachable!()))
+                            .map_err(crate::Error::new_body_write)?;
+                        return Poll::Ready(Ok(()));
+                    } else {
+                        trace!("discarding unknown frame");
+                        // loop again
+                    }
+                }
+                Some(Err(e)) => return Poll::Ready(Err(me.body_tx.on_user_err(e))),
+                None => {
+                    // no more frames means we're done here
+                    // but at this point, we haven't sent an EOS DATA, or
+                    // any trailers, so send an empty EOS DATA.
+                    return Poll::Ready(me.body_tx.send_eos_frame());
+                }
+            }
+        }
+    }
+}
+
+trait SendStreamExt {
+    fn on_user_err<E>(&mut self, err: E) -> crate::Error
+    where
+        E: Into<Box<dyn std::error::Error + Send + Sync>>;
+    fn send_eos_frame(&mut self) -> crate::Result<()>;
+}
+
+impl<B: Buf> SendStreamExt for SendStream<SendBuf<B>> {
+    fn on_user_err<E>(&mut self, err: E) -> crate::Error
+    where
+        E: Into<Box<dyn std::error::Error + Send + Sync>>,
+    {
+        let err = crate::Error::new_user_body(err);
+        debug!("send body user stream error: {}", err);
+        self.send_reset(err.h2_reason());
+        err
+    }
+
+    fn send_eos_frame(&mut self) -> crate::Result<()> {
+        trace!("send body eos");
+        self.send_data(SendBuf::None, true)
+            .map_err(crate::Error::new_body_write)
+    }
+}
+
+#[repr(usize)]
+enum SendBuf<B> {
+    Buf(B),
+    Cursor(Cursor<Box<[u8]>>),
+    None,
+}
+
+impl<B: Buf> Buf for SendBuf<B> {
+    #[inline]
+    fn remaining(&self) -> usize {
+        match *self {
+            Self::Buf(ref b) => b.remaining(),
+            Self::Cursor(ref c) => Buf::remaining(c),
+            Self::None => 0,
+        }
+    }
+
+    #[inline]
+    fn chunk(&self) -> &[u8] {
+        match *self {
+            Self::Buf(ref b) => b.chunk(),
+            Self::Cursor(ref c) => c.chunk(),
+            Self::None => &[],
+        }
+    }
+
+    #[inline]
+    fn advance(&mut self, cnt: usize) {
+        match *self {
+            Self::Buf(ref mut b) => b.advance(cnt),
+            Self::Cursor(ref mut c) => c.advance(cnt),
+            Self::None => {}
+        }
+    }
+
+    fn chunks_vectored<'a>(&'a self, dst: &mut [IoSlice<'a>]) -> usize {
+        match *self {
+            Self::Buf(ref b) => b.chunks_vectored(dst),
+            Self::Cursor(ref c) => c.chunks_vectored(dst),
+            Self::None => 0,
+        }
+    }
+}
+
+struct H2Upgraded<B>
+where
+    B: Buf,
+{
+    ping: Recorder,
+    send_stream: UpgradedSendStream<B>,
+    recv_stream: RecvStream,
+    buf: Bytes,
+}
+
+impl<B> Read for H2Upgraded<B>
+where
+    B: Buf,
+{
+    fn poll_read(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        mut read_buf: ReadBufCursor<'_>,
+    ) -> Poll<Result<(), std::io::Error>> {
+        if self.buf.is_empty() {
+            self.buf = loop {
+                match ready!(self.recv_stream.poll_data(cx)) {
+                    None => return Poll::Ready(Ok(())),
+                    Some(Ok(buf)) if buf.is_empty() && !self.recv_stream.is_end_stream() => {
+                        continue
+                    }
+                    Some(Ok(buf)) => {
+                        self.ping.record_data(buf.len());
+                        break buf;
+                    }
+                    Some(Err(e)) => {
+                        return Poll::Ready(match e.reason() {
+                            Some(Reason::NO_ERROR) | Some(Reason::CANCEL) => Ok(()),
+                            Some(Reason::STREAM_CLOSED) => {
+                                Err(std::io::Error::new(std::io::ErrorKind::BrokenPipe, e))
+                            }
+                            _ => Err(h2_to_io_error(e)),
+                        })
+                    }
+                }
+            };
+        }
+        let cnt = std::cmp::min(self.buf.len(), read_buf.remaining());
+        read_buf.put_slice(&self.buf[..cnt]);
+        self.buf.advance(cnt);
+        let _ = self.recv_stream.flow_control().release_capacity(cnt);
+        Poll::Ready(Ok(()))
+    }
+}
+
+impl<B> Write for H2Upgraded<B>
+where
+    B: Buf,
+{
+    fn poll_write(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<Result<usize, std::io::Error>> {
+        if buf.is_empty() {
+            return Poll::Ready(Ok(0));
+        }
+        self.send_stream.reserve_capacity(buf.len());
+
+        // We ignore all errors returned by `poll_capacity` and `write`, as we
+        // will get the correct from `poll_reset` anyway.
+        let cnt = match ready!(self.send_stream.poll_capacity(cx)) {
+            None => Some(0),
+            Some(Ok(cnt)) => self
+                .send_stream
+                .write(&buf[..cnt], false)
+                .ok()
+                .map(|()| cnt),
+            Some(Err(_)) => None,
+        };
+
+        if let Some(cnt) = cnt {
+            return Poll::Ready(Ok(cnt));
+        }
+
+        Poll::Ready(Err(h2_to_io_error(
+            match ready!(self.send_stream.poll_reset(cx)) {
+                Ok(Reason::NO_ERROR) | Ok(Reason::CANCEL) | Ok(Reason::STREAM_CLOSED) => {
+                    return Poll::Ready(Err(std::io::ErrorKind::BrokenPipe.into()))
+                }
+                Ok(reason) => reason.into(),
+                Err(e) => e,
+            },
+        )))
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
+        Poll::Ready(Ok(()))
+    }
+
+    fn poll_shutdown(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<(), std::io::Error>> {
+        if self.send_stream.write(&[], true).is_ok() {
+            return Poll::Ready(Ok(()));
+        }
+
+        Poll::Ready(Err(h2_to_io_error(
+            match ready!(self.send_stream.poll_reset(cx)) {
+                Ok(Reason::NO_ERROR) => return Poll::Ready(Ok(())),
+                Ok(Reason::CANCEL) | Ok(Reason::STREAM_CLOSED) => {
+                    return Poll::Ready(Err(std::io::ErrorKind::BrokenPipe.into()))
+                }
+                Ok(reason) => reason.into(),
+                Err(e) => e,
+            },
+        )))
+    }
+}
+
+fn h2_to_io_error(e: h2::Error) -> std::io::Error {
+    if e.is_io() {
+        e.into_io().unwrap()
+    } else {
+        std::io::Error::new(std::io::ErrorKind::Other, e)
+    }
+}
+
+struct UpgradedSendStream<B>(SendStream<SendBuf<Neutered<B>>>);
+
+impl<B> UpgradedSendStream<B>
+where
+    B: Buf,
+{
+    unsafe fn new(inner: SendStream<SendBuf<B>>) -> Self {
+        assert_eq!(mem::size_of::<B>(), mem::size_of::<Neutered<B>>());
+        Self(mem::transmute(inner))
+    }
+
+    fn reserve_capacity(&mut self, cnt: usize) {
+        unsafe { self.as_inner_unchecked().reserve_capacity(cnt) }
+    }
+
+    fn poll_capacity(&mut self, cx: &mut Context<'_>) -> Poll<Option<Result<usize, h2::Error>>> {
+        unsafe { self.as_inner_unchecked().poll_capacity(cx) }
+    }
+
+    fn poll_reset(&mut self, cx: &mut Context<'_>) -> Poll<Result<h2::Reason, h2::Error>> {
+        unsafe { self.as_inner_unchecked().poll_reset(cx) }
+    }
+
+    fn write(&mut self, buf: &[u8], end_of_stream: bool) -> Result<(), std::io::Error> {
+        let send_buf = SendBuf::Cursor(Cursor::new(buf.into()));
+        unsafe {
+            self.as_inner_unchecked()
+                .send_data(send_buf, end_of_stream)
+                .map_err(h2_to_io_error)
+        }
+    }
+
+    unsafe fn as_inner_unchecked(&mut self) -> &mut SendStream<SendBuf<B>> {
+        &mut *(&mut self.0 as *mut _ as *mut _)
+    }
+}
+
+#[repr(transparent)]
+struct Neutered<B> {
+    _inner: B,
+    impossible: Impossible,
+}
+
+enum Impossible {}
+
+unsafe impl<B> Send for Neutered<B> {}
+
+impl<B> Buf for Neutered<B> {
+    fn remaining(&self) -> usize {
+        match self.impossible {}
+    }
+
+    fn chunk(&self) -> &[u8] {
+        match self.impossible {}
+    }
+
+    fn advance(&mut self, _cnt: usize) {
+        match self.impossible {}
+    }
+}
diff --git a/vendor/hyper/src/proto/h2/ping.rs b/vendor/hyper/src/proto/h2/ping.rs
new file mode 100644
index 00000000..749cf1b7
--- /dev/null
+++ b/vendor/hyper/src/proto/h2/ping.rs
@@ -0,0 +1,509 @@
+/// HTTP2 Ping usage
+///
+/// hyper uses HTTP2 pings for two purposes:
+///
+/// 1. Adaptive flow control using BDP
+/// 2. Connection keep-alive
+///
+/// Both cases are optional.
+///
+/// # BDP Algorithm
+///
+/// 1. When receiving a DATA frame, if a BDP ping isn't outstanding:
+///    1a. Record current time.
+///    1b. Send a BDP ping.
+/// 2. Increment the number of received bytes.
+/// 3. When the BDP ping ack is received:
+///    3a. Record duration from sent time.
+///    3b. Merge RTT with a running average.
+///    3c. Calculate bdp as bytes/rtt.
+///    3d. If bdp is over 2/3 max, set new max to bdp and update windows.
+use std::fmt;
+use std::future::Future;
+use std::pin::Pin;
+use std::sync::{Arc, Mutex};
+use std::task::{self, Poll};
+use std::time::{Duration, Instant};
+
+use h2::{Ping, PingPong};
+
+use crate::common::time::Time;
+use crate::rt::Sleep;
+
+type WindowSize = u32;
+
+pub(super) fn disabled() -> Recorder {
+    Recorder { shared: None }
+}
+
+pub(super) fn channel(ping_pong: PingPong, config: Config, __timer: Time) -> (Recorder, Ponger) {
+    debug_assert!(
+        config.is_enabled(),
+        "ping channel requires bdp or keep-alive config",
+    );
+
+    let bdp = config.bdp_initial_window.map(|wnd| Bdp {
+        bdp: wnd,
+        max_bandwidth: 0.0,
+        rtt: 0.0,
+        ping_delay: Duration::from_millis(100),
+        stable_count: 0,
+    });
+
+    let (bytes, next_bdp_at) = if bdp.is_some() {
+        (Some(0), Some(Instant::now()))
+    } else {
+        (None, None)
+    };
+
+    let keep_alive = config.keep_alive_interval.map(|interval| KeepAlive {
+        interval,
+        timeout: config.keep_alive_timeout,
+        while_idle: config.keep_alive_while_idle,
+        sleep: __timer.sleep(interval),
+        state: KeepAliveState::Init,
+        timer: __timer,
+    });
+
+    let last_read_at = keep_alive.as_ref().map(|_| Instant::now());
+
+    let shared = Arc::new(Mutex::new(Shared {
+        bytes,
+        last_read_at,
+        is_keep_alive_timed_out: false,
+        ping_pong,
+        ping_sent_at: None,
+        next_bdp_at,
+    }));
+
+    (
+        Recorder {
+            shared: Some(shared.clone()),
+        },
+        Ponger {
+            bdp,
+            keep_alive,
+            shared,
+        },
+    )
+}
+
+#[derive(Clone)]
+pub(super) struct Config {
+    pub(super) bdp_initial_window: Option<WindowSize>,
+    /// If no frames are received in this amount of time, a PING frame is sent.
+    pub(super) keep_alive_interval: Option<Duration>,
+    /// After sending a keepalive PING, the connection will be closed if
+    /// a pong is not received in this amount of time.
+    pub(super) keep_alive_timeout: Duration,
+    /// If true, sends pings even when there are no active streams.
+    pub(super) keep_alive_while_idle: bool,
+}
+
+#[derive(Clone)]
+pub(crate) struct Recorder {
+    shared: Option<Arc<Mutex<Shared>>>,
+}
+
+pub(super) struct Ponger {
+    bdp: Option<Bdp>,
+    keep_alive: Option<KeepAlive>,
+    shared: Arc<Mutex<Shared>>,
+}
+
+struct Shared {
+    ping_pong: PingPong,
+    ping_sent_at: Option<Instant>,
+
+    // bdp
+    /// If `Some`, bdp is enabled, and this tracks how many bytes have been
+    /// read during the current sample.
+    bytes: Option<usize>,
+    /// We delay a variable amount of time between BDP pings. This allows us
+    /// to send less pings as the bandwidth stabilizes.
+    next_bdp_at: Option<Instant>,
+
+    // keep-alive
+    /// If `Some`, keep-alive is enabled, and the Instant is how long ago
+    /// the connection read the last frame.
+    last_read_at: Option<Instant>,
+
+    is_keep_alive_timed_out: bool,
+}
+
+struct Bdp {
+    /// Current BDP in bytes
+    bdp: u32,
+    /// Largest bandwidth we've seen so far.
+    max_bandwidth: f64,
+    /// Round trip time in seconds
+    rtt: f64,
+    /// Delay the next ping by this amount.
+    ///
+    /// This will change depending on how stable the current bandwidth is.
+    ping_delay: Duration,
+    /// The count of ping round trips where BDP has stayed the same.
+    stable_count: u32,
+}
+
+struct KeepAlive {
+    /// If no frames are received in this amount of time, a PING frame is sent.
+    interval: Duration,
+    /// After sending a keepalive PING, the connection will be closed if
+    /// a pong is not received in this amount of time.
+    timeout: Duration,
+    /// If true, sends pings even when there are no active streams.
+    while_idle: bool,
+    state: KeepAliveState,
+    sleep: Pin<Box<dyn Sleep>>,
+    timer: Time,
+}
+
+enum KeepAliveState {
+    Init,
+    Scheduled(Instant),
+    PingSent,
+}
+
+pub(super) enum Ponged {
+    SizeUpdate(WindowSize),
+    KeepAliveTimedOut,
+}
+
+#[derive(Debug)]
+pub(super) struct KeepAliveTimedOut;
+
+// ===== impl Config =====
+
+impl Config {
+    pub(super) fn is_enabled(&self) -> bool {
+        self.bdp_initial_window.is_some() || self.keep_alive_interval.is_some()
+    }
+}
+
+// ===== impl Recorder =====
+
+impl Recorder {
+    pub(crate) fn record_data(&self, len: usize) {
+        let shared = if let Some(ref shared) = self.shared {
+            shared
+        } else {
+            return;
+        };
+
+        let mut locked = shared.lock().unwrap();
+
+        locked.update_last_read_at();
+
+        // are we ready to send another bdp ping?
+        // if not, we don't need to record bytes either
+
+        if let Some(ref next_bdp_at) = locked.next_bdp_at {
+            if Instant::now() < *next_bdp_at {
+                return;
+            } else {
+                locked.next_bdp_at = None;
+            }
+        }
+
+        if let Some(ref mut bytes) = locked.bytes {
+            *bytes += len;
+        } else {
+            // no need to send bdp ping if bdp is disabled
+            return;
+        }
+
+        if !locked.is_ping_sent() {
+            locked.send_ping();
+        }
+    }
+
+    pub(crate) fn record_non_data(&self) {
+        let shared = if let Some(ref shared) = self.shared {
+            shared
+        } else {
+            return;
+        };
+
+        let mut locked = shared.lock().unwrap();
+
+        locked.update_last_read_at();
+    }
+
+    /// If the incoming stream is already closed, convert self into
+    /// a disabled reporter.
+    #[cfg(feature = "client")]
+    pub(super) fn for_stream(self, stream: &h2::RecvStream) -> Self {
+        if stream.is_end_stream() {
+            disabled()
+        } else {
+            self
+        }
+    }
+
+    pub(super) fn ensure_not_timed_out(&self) -> crate::Result<()> {
+        if let Some(ref shared) = self.shared {
+            let locked = shared.lock().unwrap();
+            if locked.is_keep_alive_timed_out {
+                return Err(KeepAliveTimedOut.crate_error());
+            }
+        }
+
+        // else
+        Ok(())
+    }
+}
+
+// ===== impl Ponger =====
+
+impl Ponger {
+    pub(super) fn poll(&mut self, cx: &mut task::Context<'_>) -> Poll<Ponged> {
+        let now = Instant::now();
+        let mut locked = self.shared.lock().unwrap();
+        let is_idle = self.is_idle();
+
+        if let Some(ref mut ka) = self.keep_alive {
+            ka.maybe_schedule(is_idle, &locked);
+            ka.maybe_ping(cx, is_idle, &mut locked);
+        }
+
+        if !locked.is_ping_sent() {
+            // XXX: this doesn't register a waker...?
+            return Poll::Pending;
+        }
+
+        match locked.ping_pong.poll_pong(cx) {
+            Poll::Ready(Ok(_pong)) => {
+                let start = locked
+                    .ping_sent_at
+                    .expect("pong received implies ping_sent_at");
+                locked.ping_sent_at = None;
+                let rtt = now - start;
+                trace!("recv pong");
+
+                if let Some(ref mut ka) = self.keep_alive {
+                    locked.update_last_read_at();
+                    ka.maybe_schedule(is_idle, &locked);
+                    ka.maybe_ping(cx, is_idle, &mut locked);
+                }
+
+                if let Some(ref mut bdp) = self.bdp {
+                    let bytes = locked.bytes.expect("bdp enabled implies bytes");
+                    locked.bytes = Some(0); // reset
+                    trace!("received BDP ack; bytes = {}, rtt = {:?}", bytes, rtt);
+
+                    let update = bdp.calculate(bytes, rtt);
+                    locked.next_bdp_at = Some(now + bdp.ping_delay);
+                    if let Some(update) = update {
+                        return Poll::Ready(Ponged::SizeUpdate(update));
+                    }
+                }
+            }
+            Poll::Ready(Err(_e)) => {
+                debug!("pong error: {}", _e);
+            }
+            Poll::Pending => {
+                if let Some(ref mut ka) = self.keep_alive {
+                    if let Err(KeepAliveTimedOut) = ka.maybe_timeout(cx) {
+                        self.keep_alive = None;
+                        locked.is_keep_alive_timed_out = true;
+                        return Poll::Ready(Ponged::KeepAliveTimedOut);
+                    }
+                }
+            }
+        }
+
+        // XXX: this doesn't register a waker...?
+        Poll::Pending
+    }
+
+    fn is_idle(&self) -> bool {
+        Arc::strong_count(&self.shared) <= 2
+    }
+}
+
+// ===== impl Shared =====
+
+impl Shared {
+    fn send_ping(&mut self) {
+        match self.ping_pong.send_ping(Ping::opaque()) {
+            Ok(()) => {
+                self.ping_sent_at = Some(Instant::now());
+                trace!("sent ping");
+            }
+            Err(_err) => {
+                debug!("error sending ping: {}", _err);
+            }
+        }
+    }
+
+    fn is_ping_sent(&self) -> bool {
+        self.ping_sent_at.is_some()
+    }
+
+    fn update_last_read_at(&mut self) {
+        if self.last_read_at.is_some() {
+            self.last_read_at = Some(Instant::now());
+        }
+    }
+
+    fn last_read_at(&self) -> Instant {
+        self.last_read_at.expect("keep_alive expects last_read_at")
+    }
+}
+
+// ===== impl Bdp =====
+
+/// Any higher than this likely will be hitting the TCP flow control.
+const BDP_LIMIT: usize = 1024 * 1024 * 16;
+
+impl Bdp {
+    fn calculate(&mut self, bytes: usize, rtt: Duration) -> Option<WindowSize> {
+        // No need to do any math if we're at the limit.
+        if self.bdp as usize == BDP_LIMIT {
+            self.stabilize_delay();
+            return None;
+        }
+
+        // average the rtt
+        let rtt = seconds(rtt);
+        if self.rtt == 0.0 {
+            // First sample means rtt is first rtt.
+            self.rtt = rtt;
+        } else {
+            // Weigh this rtt as 1/8 for a moving average.
+            self.rtt += (rtt - self.rtt) * 0.125;
+        }
+
+        // calculate the current bandwidth
+        let bw = (bytes as f64) / (self.rtt * 1.5);
+        trace!("current bandwidth = {:.1}B/s", bw);
+
+        if bw < self.max_bandwidth {
+            // not a faster bandwidth, so don't update
+            self.stabilize_delay();
+            return None;
+        } else {
+            self.max_bandwidth = bw;
+        }
+
+        // if the current `bytes` sample is at least 2/3 the previous
+        // bdp, increase to double the current sample.
+        if bytes >= self.bdp as usize * 2 / 3 {
+            self.bdp = (bytes * 2).min(BDP_LIMIT) as WindowSize;
+            trace!("BDP increased to {}", self.bdp);
+
+            self.stable_count = 0;
+            self.ping_delay /= 2;
+            Some(self.bdp)
+        } else {
+            self.stabilize_delay();
+            None
+        }
+    }
+
+    fn stabilize_delay(&mut self) {
+        if self.ping_delay < Duration::from_secs(10) {
+            self.stable_count += 1;
+
+            if self.stable_count >= 2 {
+                self.ping_delay *= 4;
+                self.stable_count = 0;
+            }
+        }
+    }
+}
+
+fn seconds(dur: Duration) -> f64 {
+    const NANOS_PER_SEC: f64 = 1_000_000_000.0;
+    let secs = dur.as_secs() as f64;
+    secs + (dur.subsec_nanos() as f64) / NANOS_PER_SEC
+}
+
+// ===== impl KeepAlive =====
+
+impl KeepAlive {
+    fn maybe_schedule(&mut self, is_idle: bool, shared: &Shared) {
+        match self.state {
+            KeepAliveState::Init => {
+                if !self.while_idle && is_idle {
+                    return;
+                }
+
+                self.schedule(shared);
+            }
+            KeepAliveState::PingSent => {
+                if shared.is_ping_sent() {
+                    return;
+                }
+                self.schedule(shared);
+            }
+            KeepAliveState::Scheduled(..) => (),
+        }
+    }
+
+    fn schedule(&mut self, shared: &Shared) {
+        let interval = shared.last_read_at() + self.interval;
+        self.state = KeepAliveState::Scheduled(interval);
+        self.timer.reset(&mut self.sleep, interval);
+    }
+
+    fn maybe_ping(&mut self, cx: &mut task::Context<'_>, is_idle: bool, shared: &mut Shared) {
+        match self.state {
+            KeepAliveState::Scheduled(at) => {
+                if Pin::new(&mut self.sleep).poll(cx).is_pending() {
+                    return;
+                }
+                // check if we've received a frame while we were scheduled
+                if shared.last_read_at() + self.interval > at {
+                    self.state = KeepAliveState::Init;
+                    cx.waker().wake_by_ref(); // schedule us again
+                    return;
+                }
+                if !self.while_idle && is_idle {
+                    trace!("keep-alive no need to ping when idle and while_idle=false");
+                    return;
+                }
+                trace!("keep-alive interval ({:?}) reached", self.interval);
+                shared.send_ping();
+                self.state = KeepAliveState::PingSent;
+                let timeout = Instant::now() + self.timeout;
+                self.timer.reset(&mut self.sleep, timeout);
+            }
+            KeepAliveState::Init | KeepAliveState::PingSent => (),
+        }
+    }
+
+    fn maybe_timeout(&mut self, cx: &mut task::Context<'_>) -> Result<(), KeepAliveTimedOut> {
+        match self.state {
+            KeepAliveState::PingSent => {
+                if Pin::new(&mut self.sleep).poll(cx).is_pending() {
+                    return Ok(());
+                }
+                trace!("keep-alive timeout ({:?}) reached", self.timeout);
+                Err(KeepAliveTimedOut)
+            }
+            KeepAliveState::Init | KeepAliveState::Scheduled(..) => Ok(()),
+        }
+    }
+}
+
+// ===== impl KeepAliveTimedOut =====
+
+impl KeepAliveTimedOut {
+    pub(super) fn crate_error(self) -> crate::Error {
+        crate::Error::new(crate::error::Kind::Http2).with(self)
+    }
+}
+
+impl fmt::Display for KeepAliveTimedOut {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("keep-alive timed out")
+    }
+}
+
+impl std::error::Error for KeepAliveTimedOut {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        Some(&crate::error::TimedOut)
+    }
+}
diff --git a/vendor/hyper/src/proto/h2/server.rs b/vendor/hyper/src/proto/h2/server.rs
new file mode 100644
index 00000000..a8a20dd6
--- /dev/null
+++ b/vendor/hyper/src/proto/h2/server.rs
@@ -0,0 +1,545 @@
+use std::error::Error as StdError;
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+use std::time::Duration;
+
+use bytes::Bytes;
+use futures_util::ready;
+use h2::server::{Connection, Handshake, SendResponse};
+use h2::{Reason, RecvStream};
+use http::{Method, Request};
+use pin_project_lite::pin_project;
+
+use super::{ping, PipeToSendStream, SendBuf};
+use crate::body::{Body, Incoming as IncomingBody};
+use crate::common::date;
+use crate::common::io::Compat;
+use crate::common::time::Time;
+use crate::ext::Protocol;
+use crate::headers;
+use crate::proto::h2::ping::Recorder;
+use crate::proto::h2::{H2Upgraded, UpgradedSendStream};
+use crate::proto::Dispatched;
+use crate::rt::bounds::Http2ServerConnExec;
+use crate::rt::{Read, Write};
+use crate::service::HttpService;
+
+use crate::upgrade::{OnUpgrade, Pending, Upgraded};
+use crate::Response;
+
+// Our defaults are chosen for the "majority" case, which usually are not
+// resource constrained, and so the spec default of 64kb can be too limiting
+// for performance.
+//
+// At the same time, a server more often has multiple clients connected, and
+// so is more likely to use more resources than a client would.
+const DEFAULT_CONN_WINDOW: u32 = 1024 * 1024; // 1mb
+const DEFAULT_STREAM_WINDOW: u32 = 1024 * 1024; // 1mb
+const DEFAULT_MAX_FRAME_SIZE: u32 = 1024 * 16; // 16kb
+const DEFAULT_MAX_SEND_BUF_SIZE: usize = 1024 * 400; // 400kb
+const DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE: u32 = 1024 * 16; // 16kb
+const DEFAULT_MAX_LOCAL_ERROR_RESET_STREAMS: usize = 1024;
+
+#[derive(Clone, Debug)]
+pub(crate) struct Config {
+    pub(crate) adaptive_window: bool,
+    pub(crate) initial_conn_window_size: u32,
+    pub(crate) initial_stream_window_size: u32,
+    pub(crate) max_frame_size: u32,
+    pub(crate) enable_connect_protocol: bool,
+    pub(crate) max_concurrent_streams: Option<u32>,
+    pub(crate) max_pending_accept_reset_streams: Option<usize>,
+    pub(crate) max_local_error_reset_streams: Option<usize>,
+    pub(crate) keep_alive_interval: Option<Duration>,
+    pub(crate) keep_alive_timeout: Duration,
+    pub(crate) max_send_buffer_size: usize,
+    pub(crate) max_header_list_size: u32,
+    pub(crate) date_header: bool,
+}
+
+impl Default for Config {
+    fn default() -> Config {
+        Config {
+            adaptive_window: false,
+            initial_conn_window_size: DEFAULT_CONN_WINDOW,
+            initial_stream_window_size: DEFAULT_STREAM_WINDOW,
+            max_frame_size: DEFAULT_MAX_FRAME_SIZE,
+            enable_connect_protocol: false,
+            max_concurrent_streams: Some(200),
+            max_pending_accept_reset_streams: None,
+            max_local_error_reset_streams: Some(DEFAULT_MAX_LOCAL_ERROR_RESET_STREAMS),
+            keep_alive_interval: None,
+            keep_alive_timeout: Duration::from_secs(20),
+            max_send_buffer_size: DEFAULT_MAX_SEND_BUF_SIZE,
+            max_header_list_size: DEFAULT_SETTINGS_MAX_HEADER_LIST_SIZE,
+            date_header: true,
+        }
+    }
+}
+
+pin_project! {
+    pub(crate) struct Server<T, S, B, E>
+    where
+        S: HttpService<IncomingBody>,
+        B: Body,
+    {
+        exec: E,
+        timer: Time,
+        service: S,
+        state: State<T, B>,
+        date_header: bool,
+        close_pending: bool
+    }
+}
+
+enum State<T, B>
+where
+    B: Body,
+{
+    Handshaking {
+        ping_config: ping::Config,
+        hs: Handshake<Compat<T>, SendBuf<B::Data>>,
+    },
+    Serving(Serving<T, B>),
+}
+
+struct Serving<T, B>
+where
+    B: Body,
+{
+    ping: Option<(ping::Recorder, ping::Ponger)>,
+    conn: Connection<Compat<T>, SendBuf<B::Data>>,
+    closing: Option<crate::Error>,
+    date_header: bool,
+}
+
+impl<T, S, B, E> Server<T, S, B, E>
+where
+    T: Read + Write + Unpin,
+    S: HttpService<IncomingBody, ResBody = B>,
+    S::Error: Into<Box<dyn StdError + Send + Sync>>,
+    B: Body + 'static,
+    E: Http2ServerConnExec<S::Future, B>,
+{
+    pub(crate) fn new(
+        io: T,
+        service: S,
+        config: &Config,
+        exec: E,
+        timer: Time,
+    ) -> Server<T, S, B, E> {
+        let mut builder = h2::server::Builder::default();
+        builder
+            .initial_window_size(config.initial_stream_window_size)
+            .initial_connection_window_size(config.initial_conn_window_size)
+            .max_frame_size(config.max_frame_size)
+            .max_header_list_size(config.max_header_list_size)
+            .max_local_error_reset_streams(config.max_local_error_reset_streams)
+            .max_send_buffer_size(config.max_send_buffer_size);
+        if let Some(max) = config.max_concurrent_streams {
+            builder.max_concurrent_streams(max);
+        }
+        if let Some(max) = config.max_pending_accept_reset_streams {
+            builder.max_pending_accept_reset_streams(max);
+        }
+        if config.enable_connect_protocol {
+            builder.enable_connect_protocol();
+        }
+        let handshake = builder.handshake(Compat::new(io));
+
+        let bdp = if config.adaptive_window {
+            Some(config.initial_stream_window_size)
+        } else {
+            None
+        };
+
+        let ping_config = ping::Config {
+            bdp_initial_window: bdp,
+            keep_alive_interval: config.keep_alive_interval,
+            keep_alive_timeout: config.keep_alive_timeout,
+            // If keep-alive is enabled for servers, always enabled while
+            // idle, so it can more aggressively close dead connections.
+            keep_alive_while_idle: true,
+        };
+
+        Server {
+            exec,
+            timer,
+            state: State::Handshaking {
+                ping_config,
+                hs: handshake,
+            },
+            service,
+            date_header: config.date_header,
+            close_pending: false,
+        }
+    }
+
+    pub(crate) fn graceful_shutdown(&mut self) {
+        trace!("graceful_shutdown");
+        match self.state {
+            State::Handshaking { .. } => {
+                self.close_pending = true;
+            }
+            State::Serving(ref mut srv) => {
+                if srv.closing.is_none() {
+                    srv.conn.graceful_shutdown();
+                }
+            }
+        }
+    }
+}
+
+impl<T, S, B, E> Future for Server<T, S, B, E>
+where
+    T: Read + Write + Unpin,
+    S: HttpService<IncomingBody, ResBody = B>,
+    S::Error: Into<Box<dyn StdError + Send + Sync>>,
+    B: Body + 'static,
+    E: Http2ServerConnExec<S::Future, B>,
+{
+    type Output = crate::Result<Dispatched>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let me = &mut *self;
+        loop {
+            let next = match me.state {
+                State::Handshaking {
+                    ref mut hs,
+                    ref ping_config,
+                } => {
+                    let mut conn = ready!(Pin::new(hs).poll(cx).map_err(crate::Error::new_h2))?;
+                    let ping = if ping_config.is_enabled() {
+                        let pp = conn.ping_pong().expect("conn.ping_pong");
+                        Some(ping::channel(pp, ping_config.clone(), me.timer.clone()))
+                    } else {
+                        None
+                    };
+                    State::Serving(Serving {
+                        ping,
+                        conn,
+                        closing: None,
+                        date_header: me.date_header,
+                    })
+                }
+                State::Serving(ref mut srv) => {
+                    // graceful_shutdown was called before handshaking finished,
+                    if me.close_pending && srv.closing.is_none() {
+                        srv.conn.graceful_shutdown();
+                    }
+                    ready!(srv.poll_server(cx, &mut me.service, &mut me.exec))?;
+                    return Poll::Ready(Ok(Dispatched::Shutdown));
+                }
+            };
+            me.state = next;
+        }
+    }
+}
+
+impl<T, B> Serving<T, B>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+{
+    fn poll_server<S, E>(
+        &mut self,
+        cx: &mut Context<'_>,
+        service: &mut S,
+        exec: &mut E,
+    ) -> Poll<crate::Result<()>>
+    where
+        S: HttpService<IncomingBody, ResBody = B>,
+        S::Error: Into<Box<dyn StdError + Send + Sync>>,
+        E: Http2ServerConnExec<S::Future, B>,
+    {
+        if self.closing.is_none() {
+            loop {
+                self.poll_ping(cx);
+
+                match ready!(self.conn.poll_accept(cx)) {
+                    Some(Ok((req, mut respond))) => {
+                        trace!("incoming request");
+                        let content_length = headers::content_length_parse_all(req.headers());
+                        let ping = self
+                            .ping
+                            .as_ref()
+                            .map(|ping| ping.0.clone())
+                            .unwrap_or_else(ping::disabled);
+
+                        // Record the headers received
+                        ping.record_non_data();
+
+                        let is_connect = req.method() == Method::CONNECT;
+                        let (mut parts, stream) = req.into_parts();
+                        let (mut req, connect_parts) = if !is_connect {
+                            (
+                                Request::from_parts(
+                                    parts,
+                                    IncomingBody::h2(stream, content_length.into(), ping),
+                                ),
+                                None,
+                            )
+                        } else {
+                            if content_length.map_or(false, |len| len != 0) {
+                                warn!("h2 connect request with non-zero body not supported");
+                                respond.send_reset(h2::Reason::INTERNAL_ERROR);
+                                return Poll::Ready(Ok(()));
+                            }
+                            let (pending, upgrade) = crate::upgrade::pending();
+                            debug_assert!(parts.extensions.get::<OnUpgrade>().is_none());
+                            parts.extensions.insert(upgrade);
+                            (
+                                Request::from_parts(parts, IncomingBody::empty()),
+                                Some(ConnectParts {
+                                    pending,
+                                    ping,
+                                    recv_stream: stream,
+                                }),
+                            )
+                        };
+
+                        if let Some(protocol) = req.extensions_mut().remove::<h2::ext::Protocol>() {
+                            req.extensions_mut().insert(Protocol::from_inner(protocol));
+                        }
+
+                        let fut = H2Stream::new(
+                            service.call(req),
+                            connect_parts,
+                            respond,
+                            self.date_header,
+                        );
+
+                        exec.execute_h2stream(fut);
+                    }
+                    Some(Err(e)) => {
+                        return Poll::Ready(Err(crate::Error::new_h2(e)));
+                    }
+                    None => {
+                        // no more incoming streams...
+                        if let Some((ref ping, _)) = self.ping {
+                            ping.ensure_not_timed_out()?;
+                        }
+
+                        trace!("incoming connection complete");
+                        return Poll::Ready(Ok(()));
+                    }
+                }
+            }
+        }
+
+        debug_assert!(
+            self.closing.is_some(),
+            "poll_server broke loop without closing"
+        );
+
+        ready!(self.conn.poll_closed(cx).map_err(crate::Error::new_h2))?;
+
+        Poll::Ready(Err(self.closing.take().expect("polled after error")))
+    }
+
+    fn poll_ping(&mut self, cx: &mut Context<'_>) {
+        if let Some((_, ref mut estimator)) = self.ping {
+            match estimator.poll(cx) {
+                Poll::Ready(ping::Ponged::SizeUpdate(wnd)) => {
+                    self.conn.set_target_window_size(wnd);
+                    let _ = self.conn.set_initial_window_size(wnd);
+                }
+                Poll::Ready(ping::Ponged::KeepAliveTimedOut) => {
+                    debug!("keep-alive timed out, closing connection");
+                    self.conn.abrupt_shutdown(h2::Reason::NO_ERROR);
+                }
+                Poll::Pending => {}
+            }
+        }
+    }
+}
+
+pin_project! {
+    #[allow(missing_debug_implementations)]
+    pub struct H2Stream<F, B>
+    where
+        B: Body,
+    {
+        reply: SendResponse<SendBuf<B::Data>>,
+        #[pin]
+        state: H2StreamState<F, B>,
+        date_header: bool,
+    }
+}
+
+pin_project! {
+    #[project = H2StreamStateProj]
+    enum H2StreamState<F, B>
+    where
+        B: Body,
+    {
+        Service {
+            #[pin]
+            fut: F,
+            connect_parts: Option<ConnectParts>,
+        },
+        Body {
+            #[pin]
+            pipe: PipeToSendStream<B>,
+        },
+    }
+}
+
+struct ConnectParts {
+    pending: Pending,
+    ping: Recorder,
+    recv_stream: RecvStream,
+}
+
+impl<F, B> H2Stream<F, B>
+where
+    B: Body,
+{
+    fn new(
+        fut: F,
+        connect_parts: Option<ConnectParts>,
+        respond: SendResponse<SendBuf<B::Data>>,
+        date_header: bool,
+    ) -> H2Stream<F, B> {
+        H2Stream {
+            reply: respond,
+            state: H2StreamState::Service { fut, connect_parts },
+            date_header,
+        }
+    }
+}
+
+macro_rules! reply {
+    ($me:expr, $res:expr, $eos:expr) => {{
+        match $me.reply.send_response($res, $eos) {
+            Ok(tx) => tx,
+            Err(e) => {
+                debug!("send response error: {}", e);
+                $me.reply.send_reset(Reason::INTERNAL_ERROR);
+                return Poll::Ready(Err(crate::Error::new_h2(e)));
+            }
+        }
+    }};
+}
+
+impl<F, B, E> H2Stream<F, B>
+where
+    F: Future<Output = Result<Response<B>, E>>,
+    B: Body,
+    B::Data: 'static,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+    E: Into<Box<dyn StdError + Send + Sync>>,
+{
+    fn poll2(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        let mut me = self.project();
+        loop {
+            let next = match me.state.as_mut().project() {
+                H2StreamStateProj::Service {
+                    fut: h,
+                    connect_parts,
+                } => {
+                    let res = match h.poll(cx) {
+                        Poll::Ready(Ok(r)) => r,
+                        Poll::Pending => {
+                            // Response is not yet ready, so we want to check if the client has sent a
+                            // RST_STREAM frame which would cancel the current request.
+                            if let Poll::Ready(reason) =
+                                me.reply.poll_reset(cx).map_err(crate::Error::new_h2)?
+                            {
+                                debug!("stream received RST_STREAM: {:?}", reason);
+                                return Poll::Ready(Err(crate::Error::new_h2(reason.into())));
+                            }
+                            return Poll::Pending;
+                        }
+                        Poll::Ready(Err(e)) => {
+                            let err = crate::Error::new_user_service(e);
+                            warn!("http2 service errored: {}", err);
+                            me.reply.send_reset(err.h2_reason());
+                            return Poll::Ready(Err(err));
+                        }
+                    };
+
+                    let (head, body) = res.into_parts();
+                    let mut res = ::http::Response::from_parts(head, ());
+                    super::strip_connection_headers(res.headers_mut(), false);
+
+                    // set Date header if it isn't already set if instructed
+                    if *me.date_header {
+                        res.headers_mut()
+                            .entry(::http::header::DATE)
+                            .or_insert_with(date::update_and_header_value);
+                    }
+
+                    if let Some(connect_parts) = connect_parts.take() {
+                        if res.status().is_success() {
+                            if headers::content_length_parse_all(res.headers())
+                                .map_or(false, |len| len != 0)
+                            {
+                                warn!("h2 successful response to CONNECT request with body not supported");
+                                me.reply.send_reset(h2::Reason::INTERNAL_ERROR);
+                                return Poll::Ready(Err(crate::Error::new_user_header()));
+                            }
+                            if res
+                                .headers_mut()
+                                .remove(::http::header::CONTENT_LENGTH)
+                                .is_some()
+                            {
+                                warn!("successful response to CONNECT request disallows content-length header");
+                            }
+                            let send_stream = reply!(me, res, false);
+                            connect_parts.pending.fulfill(Upgraded::new(
+                                H2Upgraded {
+                                    ping: connect_parts.ping,
+                                    recv_stream: connect_parts.recv_stream,
+                                    send_stream: unsafe { UpgradedSendStream::new(send_stream) },
+                                    buf: Bytes::new(),
+                                },
+                                Bytes::new(),
+                            ));
+                            return Poll::Ready(Ok(()));
+                        }
+                    }
+
+                    if !body.is_end_stream() {
+                        // automatically set Content-Length from body...
+                        if let Some(len) = body.size_hint().exact() {
+                            headers::set_content_length_if_missing(res.headers_mut(), len);
+                        }
+
+                        let body_tx = reply!(me, res, false);
+                        H2StreamState::Body {
+                            pipe: PipeToSendStream::new(body, body_tx),
+                        }
+                    } else {
+                        reply!(me, res, true);
+                        return Poll::Ready(Ok(()));
+                    }
+                }
+                H2StreamStateProj::Body { pipe } => {
+                    return pipe.poll(cx);
+                }
+            };
+            me.state.set(next);
+        }
+    }
+}
+
+impl<F, B, E> Future for H2Stream<F, B>
+where
+    F: Future<Output = Result<Response<B>, E>>,
+    B: Body,
+    B::Data: 'static,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+    E: Into<Box<dyn StdError + Send + Sync>>,
+{
+    type Output = ();
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        self.poll2(cx).map(|res| {
+            if let Err(_e) = res {
+                debug!("stream error: {}", _e);
+            }
+        })
+    }
+}