chore: add vendor directory

3 files changed, 1351 insertions, 0 deletions

diff --git a/vendor/hyper/src/client/conn/http1.rs b/vendor/hyper/src/client/conn/http1.rs
new file mode 100644
index 00000000..ecfe6eb8
--- /dev/null
+++ b/vendor/hyper/src/client/conn/http1.rs
@@ -0,0 +1,611 @@
+//! HTTP/1 client connections
+
+use std::error::Error as StdError;
+use std::fmt;
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+use crate::rt::{Read, Write};
+use bytes::Bytes;
+use futures_util::ready;
+use http::{Request, Response};
+use httparse::ParserConfig;
+
+use super::super::dispatch::{self, TrySendError};
+use crate::body::{Body, Incoming as IncomingBody};
+use crate::proto;
+
+type Dispatcher<T, B> =
+    proto::dispatch::Dispatcher<proto::dispatch::Client<B>, B, T, proto::h1::ClientTransaction>;
+
+/// The sender side of an established connection.
+pub struct SendRequest<B> {
+    dispatch: dispatch::Sender<Request<B>, Response<IncomingBody>>,
+}
+
+/// Deconstructed parts of a `Connection`.
+///
+/// This allows taking apart a `Connection` at a later time, in order to
+/// reclaim the IO object, and additional related pieces.
+#[derive(Debug)]
+#[non_exhaustive]
+pub struct Parts<T> {
+    /// The original IO object used in the handshake.
+    pub io: T,
+    /// A buffer of bytes that have been read but not processed as HTTP.
+    ///
+    /// For instance, if the `Connection` is used for an HTTP upgrade request,
+    /// it is possible the server sent back the first bytes of the new protocol
+    /// along with the response upgrade.
+    ///
+    /// You will want to check for any existing bytes if you plan to continue
+    /// communicating on the IO object.
+    pub read_buf: Bytes,
+}
+
+/// A future that processes all HTTP state for the IO object.
+///
+/// In most cases, this should just be spawned into an executor, so that it
+/// can process incoming and outgoing messages, notice hangups, and the like.
+///
+/// Instances of this type are typically created via the [`handshake`] function
+#[must_use = "futures do nothing unless polled"]
+pub struct Connection<T, B>
+where
+    T: Read + Write,
+    B: Body + 'static,
+{
+    inner: Dispatcher<T, B>,
+}
+
+impl<T, B> Connection<T, B>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+{
+    /// Return the inner IO object, and additional information.
+    ///
+    /// Only works for HTTP/1 connections. HTTP/2 connections will panic.
+    pub fn into_parts(self) -> Parts<T> {
+        let (io, read_buf, _) = self.inner.into_inner();
+        Parts { io, read_buf }
+    }
+
+    /// Poll the connection for completion, but without calling `shutdown`
+    /// on the underlying IO.
+    ///
+    /// This is useful to allow running a connection while doing an HTTP
+    /// upgrade. Once the upgrade is completed, the connection would be "done",
+    /// but it is not desired to actually shutdown the IO object. Instead you
+    /// would take it back using `into_parts`.
+    ///
+    /// Use [`poll_fn`](https://docs.rs/futures/0.1.25/futures/future/fn.poll_fn.html)
+    /// and [`try_ready!`](https://docs.rs/futures/0.1.25/futures/macro.try_ready.html)
+    /// to work with this function; or use the `without_shutdown` wrapper.
+    pub fn poll_without_shutdown(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        self.inner.poll_without_shutdown(cx)
+    }
+
+    /// Prevent shutdown of the underlying IO object at the end of service the request,
+    /// instead run `into_parts`. This is a convenience wrapper over `poll_without_shutdown`.
+    pub async fn without_shutdown(self) -> crate::Result<Parts<T>> {
+        let mut conn = Some(self);
+        futures_util::future::poll_fn(move |cx| -> Poll<crate::Result<Parts<T>>> {
+            ready!(conn.as_mut().unwrap().poll_without_shutdown(cx))?;
+            Poll::Ready(Ok(conn.take().unwrap().into_parts()))
+        })
+        .await
+    }
+}
+
+/// A builder to configure an HTTP connection.
+///
+/// After setting options, the builder is used to create a handshake future.
+///
+/// **Note**: The default values of options are *not considered stable*. They
+/// are subject to change at any time.
+#[derive(Clone, Debug)]
+pub struct Builder {
+    h09_responses: bool,
+    h1_parser_config: ParserConfig,
+    h1_writev: Option<bool>,
+    h1_title_case_headers: bool,
+    h1_preserve_header_case: bool,
+    h1_max_headers: Option<usize>,
+    #[cfg(feature = "ffi")]
+    h1_preserve_header_order: bool,
+    h1_read_buf_exact_size: Option<usize>,
+    h1_max_buf_size: Option<usize>,
+}
+
+/// Returns a handshake future over some IO.
+///
+/// This is a shortcut for `Builder::new().handshake(io)`.
+/// See [`client::conn`](crate::client::conn) for more.
+pub async fn handshake<T, B>(io: T) -> crate::Result<(SendRequest<B>, Connection<T, B>)>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    B::Data: Send,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+{
+    Builder::new().handshake(io).await
+}
+
+// ===== impl SendRequest
+
+impl<B> SendRequest<B> {
+    /// Polls to determine whether this sender can be used yet for a request.
+    ///
+    /// If the associated connection is closed, this returns an Error.
+    pub fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        self.dispatch.poll_ready(cx)
+    }
+
+    /// Waits until the dispatcher is ready
+    ///
+    /// If the associated connection is closed, this returns an Error.
+    pub async fn ready(&mut self) -> crate::Result<()> {
+        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+    }
+
+    /// Checks if the connection is currently ready to send a request.
+    ///
+    /// # Note
+    ///
+    /// This is mostly a hint. Due to inherent latency of networks, it is
+    /// possible that even after checking this is ready, sending a request
+    /// may still fail because the connection was closed in the meantime.
+    pub fn is_ready(&self) -> bool {
+        self.dispatch.is_ready()
+    }
+
+    /// Checks if the connection side has been closed.
+    pub fn is_closed(&self) -> bool {
+        self.dispatch.is_closed()
+    }
+}
+
+impl<B> SendRequest<B>
+where
+    B: Body + 'static,
+{
+    /// Sends a `Request` on the associated connection.
+    ///
+    /// Returns a future that if successful, yields the `Response`.
+    ///
+    /// `req` must have a `Host` header.
+    ///
+    /// # Uri
+    ///
+    /// The `Uri` of the request is serialized as-is.
+    ///
+    /// - Usually you want origin-form (`/path?query`).
+    /// - For sending to an HTTP proxy, you want to send in absolute-form
+    ///   (`https://hyper.rs/guides`).
+    ///
+    /// This is however not enforced or validated and it is up to the user
+    /// of this method to ensure the `Uri` is correct for their intended purpose.
+    pub fn send_request(
+        &mut self,
+        req: Request<B>,
+    ) -> impl Future<Output = crate::Result<Response<IncomingBody>>> {
+        let sent = self.dispatch.send(req);
+
+        async move {
+            match sent {
+                Ok(rx) => match rx.await {
+                    Ok(Ok(resp)) => Ok(resp),
+                    Ok(Err(err)) => Err(err),
+                    // this is definite bug if it happens, but it shouldn't happen!
+                    Err(_canceled) => panic!("dispatch dropped without returning error"),
+                },
+                Err(_req) => {
+                    debug!("connection was not ready");
+                    Err(crate::Error::new_canceled().with("connection was not ready"))
+                }
+            }
+        }
+    }
+
+    /// Sends a `Request` on the associated connection.
+    ///
+    /// Returns a future that if successful, yields the `Response`.
+    ///
+    /// # Error
+    ///
+    /// If there was an error before trying to serialize the request to the
+    /// connection, the message will be returned as part of this error.
+    pub fn try_send_request(
+        &mut self,
+        req: Request<B>,
+    ) -> impl Future<Output = Result<Response<IncomingBody>, TrySendError<Request<B>>>> {
+        let sent = self.dispatch.try_send(req);
+        async move {
+            match sent {
+                Ok(rx) => match rx.await {
+                    Ok(Ok(res)) => Ok(res),
+                    Ok(Err(err)) => Err(err),
+                    // this is definite bug if it happens, but it shouldn't happen!
+                    Err(_) => panic!("dispatch dropped without returning error"),
+                },
+                Err(req) => {
+                    debug!("connection was not ready");
+                    let error = crate::Error::new_canceled().with("connection was not ready");
+                    Err(TrySendError {
+                        error,
+                        message: Some(req),
+                    })
+                }
+            }
+        }
+    }
+}
+
+impl<B> fmt::Debug for SendRequest<B> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("SendRequest").finish()
+    }
+}
+
+// ===== impl Connection
+
+impl<T, B> Connection<T, B>
+where
+    T: Read + Write + Unpin + Send,
+    B: Body + 'static,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+{
+    /// Enable this connection to support higher-level HTTP upgrades.
+    ///
+    /// See [the `upgrade` module](crate::upgrade) for more.
+    pub fn with_upgrades(self) -> upgrades::UpgradeableConnection<T, B> {
+        upgrades::UpgradeableConnection { inner: Some(self) }
+    }
+}
+
+impl<T, B> fmt::Debug for Connection<T, B>
+where
+    T: Read + Write + fmt::Debug,
+    B: Body + 'static,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Connection").finish()
+    }
+}
+
+impl<T, B> Future for Connection<T, B>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    B::Data: Send,
+    B::Error: Into<Box<dyn StdError + Send + Sync>>,
+{
+    type Output = crate::Result<()>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        match ready!(Pin::new(&mut self.inner).poll(cx))? {
+            proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
+            proto::Dispatched::Upgrade(pending) => {
+                // With no `Send` bound on `I`, we can't try to do
+                // upgrades here. In case a user was trying to use
+                // `upgrade` with this API, send a special
+                // error letting them know about that.
+                pending.manual();
+                Poll::Ready(Ok(()))
+            }
+        }
+    }
+}
+
+// ===== impl Builder
+
+impl Builder {
+    /// Creates a new connection builder.
+    #[inline]
+    pub fn new() -> Builder {
+        Builder {
+            h09_responses: false,
+            h1_writev: None,
+            h1_read_buf_exact_size: None,
+            h1_parser_config: Default::default(),
+            h1_title_case_headers: false,
+            h1_preserve_header_case: false,
+            h1_max_headers: None,
+            #[cfg(feature = "ffi")]
+            h1_preserve_header_order: false,
+            h1_max_buf_size: None,
+        }
+    }
+
+    /// Set whether HTTP/0.9 responses should be tolerated.
+    ///
+    /// Default is false.
+    pub fn http09_responses(&mut self, enabled: bool) -> &mut Builder {
+        self.h09_responses = enabled;
+        self
+    }
+
+    /// Set whether HTTP/1 connections will accept spaces between header names
+    /// and the colon that follow them in responses.
+    ///
+    /// 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.
+    ///
+    /// Default is false.
+    ///
+    /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
+    pub fn allow_spaces_after_header_name_in_responses(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_parser_config
+            .allow_spaces_after_header_name_in_responses(enabled);
+        self
+    }
+
+    /// Set whether HTTP/1 connections will accept obsolete line folding for
+    /// header values.
+    ///
+    /// 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:
+    ///
+    /// > 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.
+    ///
+    /// Default is false.
+    ///
+    /// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
+    pub fn allow_obsolete_multiline_headers_in_responses(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_parser_config
+            .allow_obsolete_multiline_headers_in_responses(enabled);
+        self
+    }
+
+    /// Set whether HTTP/1 connections will silently ignored malformed header lines.
+    ///
+    /// If this is enabled and a header line does not start with a valid header
+    /// name, or does not include a colon at all, the line will be silently ignored
+    /// and no error will be reported.
+    ///
+    /// Default is false.
+    pub fn ignore_invalid_headers_in_responses(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_parser_config
+            .ignore_invalid_headers_in_responses(enabled);
+        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
+    pub fn writev(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_writev = Some(enabled);
+        self
+    }
+
+    /// Set whether HTTP/1 connections will write header names as title case at
+    /// the socket level.
+    ///
+    /// Default is false.
+    pub fn title_case_headers(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_title_case_headers = enabled;
+        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.
+    ///
+    /// Default is false.
+    pub fn preserve_header_case(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_preserve_header_case = enabled;
+        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.
+    ///
+    /// Note that 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%.
+    ///
+    /// Default is 100.
+    pub fn max_headers(&mut self, val: usize) -> &mut Self {
+        self.h1_max_headers = Some(val);
+        self
+    }
+
+    /// Set whether to support preserving original header order.
+    ///
+    /// Currently, this will record the order in which headers are received, and store this
+    /// ordering in a private extension on the `Response`. It will also look for and use
+    /// such an extension in any provided `Request`.
+    ///
+    /// Default is false.
+    #[cfg(feature = "ffi")]
+    pub fn preserve_header_order(&mut self, enabled: bool) -> &mut Builder {
+        self.h1_preserve_header_order = enabled;
+        self
+    }
+
+    /// Sets the exact size of the read buffer to *always* use.
+    ///
+    /// Note that setting this option unsets the `max_buf_size` option.
+    ///
+    /// Default is an adaptive read buffer.
+    pub fn read_buf_exact_size(&mut self, sz: Option<usize>) -> &mut Builder {
+        self.h1_read_buf_exact_size = sz;
+        self.h1_max_buf_size = None;
+        self
+    }
+
+    /// Set the maximum buffer size for the connection.
+    ///
+    /// Default is ~400kb.
+    ///
+    /// Note that setting this option unsets the `read_exact_buf_size` option.
+    ///
+    /// # Panics
+    ///
+    /// The minimum value allowed is 8192. This method panics if the passed `max` is less than the minimum.
+    pub fn max_buf_size(&mut self, max: usize) -> &mut Self {
+        assert!(
+            max >= proto::h1::MINIMUM_MAX_BUFFER_SIZE,
+            "the max_buf_size cannot be smaller than the minimum that h1 specifies."
+        );
+
+        self.h1_max_buf_size = Some(max);
+        self.h1_read_buf_exact_size = None;
+        self
+    }
+
+    /// Constructs a connection with the configured options and IO.
+    /// See [`client::conn`](crate::client::conn) for more.
+    ///
+    /// Note, if [`Connection`] is not `await`-ed, [`SendRequest`] will
+    /// do nothing.
+    pub fn handshake<T, B>(
+        &self,
+        io: T,
+    ) -> impl Future<Output = crate::Result<(SendRequest<B>, Connection<T, B>)>>
+    where
+        T: Read + Write + Unpin,
+        B: Body + 'static,
+        B::Data: Send,
+        B::Error: Into<Box<dyn StdError + Send + Sync>>,
+    {
+        let opts = self.clone();
+
+        async move {
+            trace!("client handshake HTTP/1");
+
+            let (tx, rx) = dispatch::channel();
+            let mut conn = proto::Conn::new(io);
+            conn.set_h1_parser_config(opts.h1_parser_config);
+            if let Some(writev) = opts.h1_writev {
+                if writev {
+                    conn.set_write_strategy_queue();
+                } else {
+                    conn.set_write_strategy_flatten();
+                }
+            }
+            if opts.h1_title_case_headers {
+                conn.set_title_case_headers();
+            }
+            if opts.h1_preserve_header_case {
+                conn.set_preserve_header_case();
+            }
+            if let Some(max_headers) = opts.h1_max_headers {
+                conn.set_http1_max_headers(max_headers);
+            }
+            #[cfg(feature = "ffi")]
+            if opts.h1_preserve_header_order {
+                conn.set_preserve_header_order();
+            }
+
+            if opts.h09_responses {
+                conn.set_h09_responses();
+            }
+
+            if let Some(sz) = opts.h1_read_buf_exact_size {
+                conn.set_read_buf_exact_size(sz);
+            }
+            if let Some(max) = opts.h1_max_buf_size {
+                conn.set_max_buf_size(max);
+            }
+            let cd = proto::h1::dispatch::Client::new(rx);
+            let proto = proto::h1::Dispatcher::new(cd, conn);
+
+            Ok((SendRequest { dispatch: tx }, Connection { inner: proto }))
+        }
+    }
+}
+
+mod upgrades {
+    use crate::upgrade::Upgraded;
+
+    use super::*;
+
+    // A future binding a connection with a Service with Upgrade support.
+    //
+    // This type is unnameable outside the crate.
+    #[must_use = "futures do nothing unless polled"]
+    #[allow(missing_debug_implementations)]
+    pub struct UpgradeableConnection<T, B>
+    where
+        T: Read + Write + Unpin + Send + 'static,
+        B: Body + 'static,
+        B::Error: Into<Box<dyn StdError + Send + Sync>>,
+    {
+        pub(super) inner: Option<Connection<T, B>>,
+    }
+
+    impl<I, B> Future for UpgradeableConnection<I, B>
+    where
+        I: Read + Write + Unpin + Send + 'static,
+        B: Body + 'static,
+        B::Data: Send,
+        B::Error: Into<Box<dyn StdError + Send + Sync>>,
+    {
+        type Output = crate::Result<()>;
+
+        fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+            match ready!(Pin::new(&mut self.inner.as_mut().unwrap().inner).poll(cx)) {
+                Ok(proto::Dispatched::Shutdown) => Poll::Ready(Ok(())),
+                Ok(proto::Dispatched::Upgrade(pending)) => {
+                    let Parts { io, read_buf } = self.inner.take().unwrap().into_parts();
+                    pending.fulfill(Upgraded::new(io, read_buf));
+                    Poll::Ready(Ok(()))
+                }
+                Err(e) => Poll::Ready(Err(e)),
+            }
+        }
+    }
+}
diff --git a/vendor/hyper/src/client/conn/http2.rs b/vendor/hyper/src/client/conn/http2.rs
new file mode 100644
index 00000000..3db28957
--- /dev/null
+++ b/vendor/hyper/src/client/conn/http2.rs
@@ -0,0 +1,718 @@
+//! HTTP/2 client connections
+
+use std::error::Error;
+use std::fmt;
+use std::future::Future;
+use std::marker::PhantomData;
+use std::pin::Pin;
+use std::sync::Arc;
+use std::task::{Context, Poll};
+use std::time::Duration;
+
+use crate::rt::{Read, Write};
+use futures_util::ready;
+use http::{Request, Response};
+
+use super::super::dispatch::{self, TrySendError};
+use crate::body::{Body, Incoming as IncomingBody};
+use crate::common::time::Time;
+use crate::proto;
+use crate::rt::bounds::Http2ClientConnExec;
+use crate::rt::Timer;
+
+/// The sender side of an established connection.
+pub struct SendRequest<B> {
+    dispatch: dispatch::UnboundedSender<Request<B>, Response<IncomingBody>>,
+}
+
+impl<B> Clone for SendRequest<B> {
+    fn clone(&self) -> SendRequest<B> {
+        SendRequest {
+            dispatch: self.dispatch.clone(),
+        }
+    }
+}
+
+/// A future that processes all HTTP state for the IO object.
+///
+/// In most cases, this should just be spawned into an executor, so that it
+/// can process incoming and outgoing messages, notice hangups, and the like.
+///
+/// Instances of this type are typically created via the [`handshake`] function
+#[must_use = "futures do nothing unless polled"]
+pub struct Connection<T, B, E>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+{
+    inner: (PhantomData<T>, proto::h2::ClientTask<B, E, T>),
+}
+
+/// A builder to configure an HTTP connection.
+///
+/// After setting options, the builder is used to create a handshake future.
+///
+/// **Note**: The default values of options are *not considered stable*. They
+/// are subject to change at any time.
+#[derive(Clone, Debug)]
+pub struct Builder<Ex> {
+    pub(super) exec: Ex,
+    pub(super) timer: Time,
+    h2_builder: proto::h2::client::Config,
+}
+
+/// Returns a handshake future over some IO.
+///
+/// This is a shortcut for `Builder::new(exec).handshake(io)`.
+/// See [`client::conn`](crate::client::conn) for more.
+pub async fn handshake<E, T, B>(
+    exec: E,
+    io: T,
+) -> crate::Result<(SendRequest<B>, Connection<T, B, E>)>
+where
+    T: Read + Write + Unpin,
+    B: Body + 'static,
+    B::Data: Send,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+    E: Http2ClientConnExec<B, T> + Unpin + Clone,
+{
+    Builder::new(exec).handshake(io).await
+}
+
+// ===== impl SendRequest
+
+impl<B> SendRequest<B> {
+    /// Polls to determine whether this sender can be used yet for a request.
+    ///
+    /// If the associated connection is closed, this returns an Error.
+    pub fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
+        if self.is_closed() {
+            Poll::Ready(Err(crate::Error::new_closed()))
+        } else {
+            Poll::Ready(Ok(()))
+        }
+    }
+
+    /// Waits until the dispatcher is ready
+    ///
+    /// If the associated connection is closed, this returns an Error.
+    pub async fn ready(&mut self) -> crate::Result<()> {
+        futures_util::future::poll_fn(|cx| self.poll_ready(cx)).await
+    }
+
+    /// Checks if the connection is currently ready to send a request.
+    ///
+    /// # Note
+    ///
+    /// This is mostly a hint. Due to inherent latency of networks, it is
+    /// possible that even after checking this is ready, sending a request
+    /// may still fail because the connection was closed in the meantime.
+    pub fn is_ready(&self) -> bool {
+        self.dispatch.is_ready()
+    }
+
+    /// Checks if the connection side has been closed.
+    pub fn is_closed(&self) -> bool {
+        self.dispatch.is_closed()
+    }
+}
+
+impl<B> SendRequest<B>
+where
+    B: Body + 'static,
+{
+    /// Sends a `Request` on the associated connection.
+    ///
+    /// Returns a future that if successful, yields the `Response`.
+    ///
+    /// `req` must have a `Host` header.
+    ///
+    /// Absolute-form `Uri`s are not required. If received, they will be serialized
+    /// as-is.
+    pub fn send_request(
+        &mut self,
+        req: Request<B>,
+    ) -> impl Future<Output = crate::Result<Response<IncomingBody>>> {
+        let sent = self.dispatch.send(req);
+
+        async move {
+            match sent {
+                Ok(rx) => match rx.await {
+                    Ok(Ok(resp)) => Ok(resp),
+                    Ok(Err(err)) => Err(err),
+                    // this is definite bug if it happens, but it shouldn't happen!
+                    Err(_canceled) => panic!("dispatch dropped without returning error"),
+                },
+                Err(_req) => {
+                    debug!("connection was not ready");
+
+                    Err(crate::Error::new_canceled().with("connection was not ready"))
+                }
+            }
+        }
+    }
+
+    /// Sends a `Request` on the associated connection.
+    ///
+    /// Returns a future that if successful, yields the `Response`.
+    ///
+    /// # Error
+    ///
+    /// If there was an error before trying to serialize the request to the
+    /// connection, the message will be returned as part of this error.
+    pub fn try_send_request(
+        &mut self,
+        req: Request<B>,
+    ) -> impl Future<Output = Result<Response<IncomingBody>, TrySendError<Request<B>>>> {
+        let sent = self.dispatch.try_send(req);
+        async move {
+            match sent {
+                Ok(rx) => match rx.await {
+                    Ok(Ok(res)) => Ok(res),
+                    Ok(Err(err)) => Err(err),
+                    // this is definite bug if it happens, but it shouldn't happen!
+                    Err(_) => panic!("dispatch dropped without returning error"),
+                },
+                Err(req) => {
+                    debug!("connection was not ready");
+                    let error = crate::Error::new_canceled().with("connection was not ready");
+                    Err(TrySendError {
+                        error,
+                        message: Some(req),
+                    })
+                }
+            }
+        }
+    }
+}
+
+impl<B> fmt::Debug for SendRequest<B> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("SendRequest").finish()
+    }
+}
+
+// ===== impl Connection
+
+impl<T, B, E> Connection<T, B, E>
+where
+    T: Read + Write + Unpin + 'static,
+    B: Body + Unpin + 'static,
+    B::Data: Send,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+    E: Http2ClientConnExec<B, T> + Unpin,
+{
+    /// Returns whether the [extended CONNECT protocol][1] is enabled or not.
+    ///
+    /// This setting is configured by the server peer by sending the
+    /// [`SETTINGS_ENABLE_CONNECT_PROTOCOL` parameter][2] in a `SETTINGS` frame.
+    /// This method returns the currently acknowledged value received from the
+    /// remote.
+    ///
+    /// [1]: https://datatracker.ietf.org/doc/html/rfc8441#section-4
+    /// [2]: https://datatracker.ietf.org/doc/html/rfc8441#section-3
+    pub fn is_extended_connect_protocol_enabled(&self) -> bool {
+        self.inner.1.is_extended_connect_protocol_enabled()
+    }
+}
+
+impl<T, B, E> fmt::Debug for Connection<T, B, E>
+where
+    T: Read + Write + fmt::Debug + 'static + Unpin,
+    B: Body + 'static,
+    E: Http2ClientConnExec<B, T> + Unpin,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Connection").finish()
+    }
+}
+
+impl<T, B, E> Future for Connection<T, B, E>
+where
+    T: Read + Write + Unpin + 'static,
+    B: Body + 'static + Unpin,
+    B::Data: Send,
+    E: Unpin,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+    E: Http2ClientConnExec<B, T> + Unpin,
+{
+    type Output = crate::Result<()>;
+
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        match ready!(Pin::new(&mut self.inner.1).poll(cx))? {
+            proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
+            #[cfg(feature = "http1")]
+            proto::Dispatched::Upgrade(_pending) => unreachable!("http2 cannot upgrade"),
+        }
+    }
+}
+
+// ===== impl Builder
+
+impl<Ex> Builder<Ex>
+where
+    Ex: Clone,
+{
+    /// Creates a new connection builder.
+    #[inline]
+    pub fn new(exec: Ex) -> Builder<Ex> {
+        Builder {
+            exec,
+            timer: Time::Empty,
+            h2_builder: Default::default(),
+        }
+    }
+
+    /// Provide a timer to execute background HTTP2 tasks.
+    pub fn timer<M>(&mut self, timer: M) -> &mut Builder<Ex>
+    where
+        M: Timer + Send + Sync + 'static,
+    {
+        self.timer = Time::Timer(Arc::new(timer));
+        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://httpwg.org/specs/rfc9113.html#SETTINGS_INITIAL_WINDOW_SIZE
+    pub fn initial_stream_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
+        if let Some(sz) = sz.into() {
+            self.h2_builder.adaptive_window = false;
+            self.h2_builder.initial_stream_window_size = sz;
+        }
+        self
+    }
+
+    /// Sets the max connection-level flow control for HTTP2
+    ///
+    /// Passing `None` will do nothing.
+    ///
+    /// If not set, hyper will use a default.
+    pub fn initial_connection_window_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
+        if let Some(sz) = sz.into() {
+            self.h2_builder.adaptive_window = false;
+            self.h2_builder.initial_conn_window_size = sz;
+        }
+        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
+    pub fn initial_max_send_streams(&mut self, initial: impl Into<Option<usize>>) -> &mut Self {
+        if let Some(initial) = initial.into() {
+            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
+    /// `initial_stream_window_size` and
+    /// `initial_connection_window_size`.
+    pub fn adaptive_window(&mut self, enabled: bool) -> &mut Self {
+        use proto::h2::SPEC_WINDOW_SIZE;
+
+        self.h2_builder.adaptive_window = enabled;
+        if enabled {
+            self.h2_builder.initial_conn_window_size = SPEC_WINDOW_SIZE;
+            self.h2_builder.initial_stream_window_size = SPEC_WINDOW_SIZE;
+        }
+        self
+    }
+
+    /// Sets the maximum frame size to use for HTTP2.
+    ///
+    /// Default is currently 16KB, but can change.
+    pub fn max_frame_size(&mut self, sz: impl Into<Option<u32>>) -> &mut Self {
+        self.h2_builder.max_frame_size = sz.into();
+        self
+    }
+
+    /// Sets the max size of received header frames.
+    ///
+    /// Default is currently 16KB, but can change.
+    pub fn max_header_list_size(&mut self, max: u32) -> &mut Self {
+        self.h2_builder.max_header_list_size = max;
+        self
+    }
+
+    /// Sets the header table size.
+    ///
+    /// This setting informs the peer of the maximum size of the header compression
+    /// table used to encode header blocks, in octets. The encoder may select any value
+    /// equal to or less than the header table size specified by the sender.
+    ///
+    /// The default value of crate `h2` is 4,096.
+    pub fn header_table_size(&mut self, size: impl Into<Option<u32>>) -> &mut Self {
+        self.h2_builder.header_table_size = size.into();
+        self
+    }
+
+    /// Sets the maximum number of concurrent streams.
+    ///
+    /// The maximum concurrent streams setting only controls the maximum number
+    /// of streams that can be initiated by the remote peer. In other words,
+    /// when this setting is set to 100, this does not limit the number of
+    /// concurrent streams that can be created by the caller.
+    ///
+    /// It is recommended that this value be no smaller than 100, so as to not
+    /// unnecessarily limit parallelism. However, any value is legal, including
+    /// 0. If `max` is set to 0, then the remote will not be permitted to
+    /// initiate streams.
+    ///
+    /// Note that streams in the reserved state, i.e., push promises that have
+    /// been reserved but the stream has not started, do not count against this
+    /// setting.
+    ///
+    /// Also note that if the remote *does* exceed the value set here, it is not
+    /// a protocol level error. Instead, the `h2` library will immediately reset
+    /// the stream.
+    ///
+    /// See [Section 5.1.2] in the HTTP/2 spec for more details.
+    ///
+    /// [Section 5.1.2]: https://http2.github.io/http2-spec/#rfc.section.5.1.2
+    pub fn max_concurrent_streams(&mut self, max: impl Into<Option<u32>>) -> &mut Self {
+        self.h2_builder.max_concurrent_streams = max.into();
+        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.
+    pub fn keep_alive_interval(&mut self, interval: impl Into<Option<Duration>>) -> &mut Self {
+        self.h2_builder.keep_alive_interval = interval.into();
+        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 `keep_alive_interval` is disabled.
+    ///
+    /// Default is 20 seconds.
+    pub fn keep_alive_timeout(&mut self, timeout: Duration) -> &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 `keep_alive_interval` is
+    /// disabled.
+    ///
+    /// Default is `false`.
+    pub fn keep_alive_while_idle(&mut self, enabled: bool) -> &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
+    pub fn max_concurrent_reset_streams(&mut self, max: usize) -> &mut Self {
+        self.h2_builder.max_concurrent_reset_streams = Some(max);
+        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`.
+    pub fn max_send_buf_size(&mut self, max: usize) -> &mut Self {
+        assert!(max <= u32::MAX as usize);
+        self.h2_builder.max_send_buffer_size = max;
+        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.
+    pub fn 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
+    }
+
+    /// Constructs a connection with the configured options and IO.
+    /// See [`client::conn`](crate::client::conn) for more.
+    ///
+    /// Note, if [`Connection`] is not `await`-ed, [`SendRequest`] will
+    /// do nothing.
+    pub fn handshake<T, B>(
+        &self,
+        io: T,
+    ) -> impl Future<Output = crate::Result<(SendRequest<B>, Connection<T, B, Ex>)>>
+    where
+        T: Read + Write + Unpin,
+        B: Body + 'static,
+        B::Data: Send,
+        B::Error: Into<Box<dyn Error + Send + Sync>>,
+        Ex: Http2ClientConnExec<B, T> + Unpin,
+    {
+        let opts = self.clone();
+
+        async move {
+            trace!("client handshake HTTP/2");
+
+            let (tx, rx) = dispatch::channel();
+            let h2 = proto::h2::client::handshake(io, rx, &opts.h2_builder, opts.exec, opts.timer)
+                .await?;
+            Ok((
+                SendRequest {
+                    dispatch: tx.unbound(),
+                },
+                Connection {
+                    inner: (PhantomData, h2),
+                },
+            ))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn send_sync_executor_of_non_send_futures() {
+        #[derive(Clone)]
+        struct LocalTokioExecutor;
+
+        impl<F> crate::rt::Executor<F> for LocalTokioExecutor
+        where
+            F: std::future::Future + 'static, // not requiring `Send`
+        {
+            fn execute(&self, fut: F) {
+                // This will spawn into the currently running `LocalSet`.
+                tokio::task::spawn_local(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Unpin + 'static) {
+            let (_sender, conn) = crate::client::conn::http2::handshake::<
+                _,
+                _,
+                http_body_util::Empty<bytes::Bytes>,
+            >(LocalTokioExecutor, io)
+            .await
+            .unwrap();
+
+            tokio::task::spawn_local(async move {
+                conn.await.unwrap();
+            });
+        }
+    }
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn not_send_not_sync_executor_of_not_send_futures() {
+        #[derive(Clone)]
+        struct LocalTokioExecutor {
+            _x: std::marker::PhantomData<std::rc::Rc<()>>,
+        }
+
+        impl<F> crate::rt::Executor<F> for LocalTokioExecutor
+        where
+            F: std::future::Future + 'static, // not requiring `Send`
+        {
+            fn execute(&self, fut: F) {
+                // This will spawn into the currently running `LocalSet`.
+                tokio::task::spawn_local(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Unpin + 'static) {
+            let (_sender, conn) =
+                crate::client::conn::http2::handshake::<_, _, http_body_util::Empty<bytes::Bytes>>(
+                    LocalTokioExecutor {
+                        _x: Default::default(),
+                    },
+                    io,
+                )
+                .await
+                .unwrap();
+
+            tokio::task::spawn_local(async move {
+                conn.await.unwrap();
+            });
+        }
+    }
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn send_not_sync_executor_of_not_send_futures() {
+        #[derive(Clone)]
+        struct LocalTokioExecutor {
+            _x: std::marker::PhantomData<std::cell::Cell<()>>,
+        }
+
+        impl<F> crate::rt::Executor<F> for LocalTokioExecutor
+        where
+            F: std::future::Future + 'static, // not requiring `Send`
+        {
+            fn execute(&self, fut: F) {
+                // This will spawn into the currently running `LocalSet`.
+                tokio::task::spawn_local(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Unpin + 'static) {
+            let (_sender, conn) =
+                crate::client::conn::http2::handshake::<_, _, http_body_util::Empty<bytes::Bytes>>(
+                    LocalTokioExecutor {
+                        _x: Default::default(),
+                    },
+                    io,
+                )
+                .await
+                .unwrap();
+
+            tokio::task::spawn_local(async move {
+                conn.await.unwrap();
+            });
+        }
+    }
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn send_sync_executor_of_send_futures() {
+        #[derive(Clone)]
+        struct TokioExecutor;
+
+        impl<F> crate::rt::Executor<F> for TokioExecutor
+        where
+            F: std::future::Future + 'static + Send,
+            F::Output: Send + 'static,
+        {
+            fn execute(&self, fut: F) {
+                tokio::task::spawn(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Send + Unpin + 'static) {
+            let (_sender, conn) = crate::client::conn::http2::handshake::<
+                _,
+                _,
+                http_body_util::Empty<bytes::Bytes>,
+            >(TokioExecutor, io)
+            .await
+            .unwrap();
+
+            tokio::task::spawn(async move {
+                conn.await.unwrap();
+            });
+        }
+    }
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn not_send_not_sync_executor_of_send_futures() {
+        #[derive(Clone)]
+        struct TokioExecutor {
+            // !Send, !Sync
+            _x: std::marker::PhantomData<std::rc::Rc<()>>,
+        }
+
+        impl<F> crate::rt::Executor<F> for TokioExecutor
+        where
+            F: std::future::Future + 'static + Send,
+            F::Output: Send + 'static,
+        {
+            fn execute(&self, fut: F) {
+                tokio::task::spawn(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Send + Unpin + 'static) {
+            let (_sender, conn) =
+                crate::client::conn::http2::handshake::<_, _, http_body_util::Empty<bytes::Bytes>>(
+                    TokioExecutor {
+                        _x: Default::default(),
+                    },
+                    io,
+                )
+                .await
+                .unwrap();
+
+            tokio::task::spawn_local(async move {
+                // can't use spawn here because when executor is !Send
+                conn.await.unwrap();
+            });
+        }
+    }
+
+    #[tokio::test]
+    #[ignore] // only compilation is checked
+    async fn send_not_sync_executor_of_send_futures() {
+        #[derive(Clone)]
+        struct TokioExecutor {
+            // !Sync
+            _x: std::marker::PhantomData<std::cell::Cell<()>>,
+        }
+
+        impl<F> crate::rt::Executor<F> for TokioExecutor
+        where
+            F: std::future::Future + 'static + Send,
+            F::Output: Send + 'static,
+        {
+            fn execute(&self, fut: F) {
+                tokio::task::spawn(fut);
+            }
+        }
+
+        #[allow(unused)]
+        async fn run(io: impl crate::rt::Read + crate::rt::Write + Send + Unpin + 'static) {
+            let (_sender, conn) =
+                crate::client::conn::http2::handshake::<_, _, http_body_util::Empty<bytes::Bytes>>(
+                    TokioExecutor {
+                        _x: Default::default(),
+                    },
+                    io,
+                )
+                .await
+                .unwrap();
+
+            tokio::task::spawn_local(async move {
+                // can't use spawn here because when executor is !Send
+                conn.await.unwrap();
+            });
+        }
+    }
+}
diff --git a/vendor/hyper/src/client/conn/mod.rs b/vendor/hyper/src/client/conn/mod.rs
new file mode 100644
index 00000000..f982ae6d
--- /dev/null
+++ b/vendor/hyper/src/client/conn/mod.rs
@@ -0,0 +1,22 @@
+//! Lower-level client connection API.
+//!
+//! The types in this module are to provide a lower-level API based around a
+//! single connection. Connecting to a host, pooling connections, and the like
+//! are not handled at this level. This module provides the building blocks to
+//! customize those things externally.
+//!
+//! If you are looking for a convenient HTTP client, then you may wish to
+//! consider [reqwest](https://github.com/seanmonstar/reqwest) for a high level
+//! client or [`hyper-util`'s client](https://docs.rs/hyper-util/latest/hyper_util/client/index.html)
+//! if you want to keep it more low level / basic.
+//!
+//! ## Example
+//!
+//! See the [client guide](https://hyper.rs/guides/1/client/basic/).
+
+#[cfg(feature = "http1")]
+pub mod http1;
+#[cfg(feature = "http2")]
+pub mod http2;
+
+pub use super::dispatch::TrySendError;