647 lines
23 KiB
Rust
647 lines
23 KiB
Rust
//! HTTP/1 client connections.
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use std::error::Error as StdError;
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use std::fmt;
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use std::future::Future;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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use crate::rt::{Read, Write};
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use bytes::Bytes;
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use futures_core::ready;
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use http::{Request, Response};
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use httparse::ParserConfig;
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use super::super::dispatch::{self, TrySendError};
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use crate::body::{Body, Incoming as IncomingBody};
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use crate::proto;
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type Dispatcher<T, B> =
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proto::dispatch::Dispatcher<proto::dispatch::Client<B>, B, T, proto::h1::ClientTransaction>;
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/// The sender side of an established connection.
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pub struct SendRequest<B> {
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dispatch: dispatch::Sender<Request<B>, Response<IncomingBody>>,
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}
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/// Deconstructed parts of a `Connection`.
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///
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/// This allows taking apart a `Connection` at a later time, in order to
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/// reclaim the IO object, and additional related pieces.
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#[derive(Debug)]
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#[non_exhaustive]
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pub struct Parts<T> {
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/// The original IO object used in the handshake.
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pub io: T,
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/// A buffer of bytes that have been read but not processed as HTTP.
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///
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/// For instance, if the `Connection` is used for an HTTP upgrade request,
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/// it is possible the server sent back the first bytes of the new protocol
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/// along with the response upgrade.
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///
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/// You will want to check for any existing bytes if you plan to continue
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/// communicating on the IO object.
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pub read_buf: Bytes,
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}
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/// A future that processes all HTTP state for the IO object.
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///
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/// In most cases, this should just be spawned into an executor, so that it
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/// can process incoming and outgoing messages, notice hangups, and the like.
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///
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/// Instances of this type are typically created via the [`handshake`] function.
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///
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/// # Drop behavior
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///
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/// Dropping the `Connection` will close the underlying IO resource.
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/// Any in-flight requests that have not received a response will be
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/// interrupted. If graceful shutdown is desired, poll the connection
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/// until it completes instead of dropping.
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#[must_use = "futures do nothing unless polled"]
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pub struct Connection<T, B>
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where
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T: Read + Write,
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B: Body + 'static,
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{
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inner: Dispatcher<T, B>,
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}
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impl<T, B> Connection<T, B>
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where
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T: Read + Write + Unpin,
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B: Body + 'static,
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B::Error: Into<Box<dyn StdError + Send + Sync>>,
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{
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/// Return the inner IO object, and additional information.
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///
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/// Only works for HTTP/1 connections. HTTP/2 connections will panic.
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pub fn into_parts(self) -> Parts<T> {
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let (io, read_buf, _) = self.inner.into_inner();
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Parts { io, read_buf }
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}
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/// Poll the connection for completion, but without calling `shutdown`
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/// on the underlying IO.
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///
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/// This is useful to allow running a connection while doing an HTTP
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/// upgrade. Once the upgrade is completed, the connection would be "done",
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/// but it is not desired to actually shutdown the IO object. Instead you
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/// would take it back using `into_parts`.
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///
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/// Use [`poll_fn`](https://docs.rs/futures/0.1.25/futures/future/fn.poll_fn.html)
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/// and [`try_ready!`](https://docs.rs/futures/0.1.25/futures/macro.try_ready.html)
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/// to work with this function; or use the `without_shutdown` wrapper.
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pub fn poll_without_shutdown(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
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self.inner.poll_without_shutdown(cx)
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}
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/// Prevent shutdown of the underlying IO object at the end of service the request,
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/// instead run `into_parts`. This is a convenience wrapper over `poll_without_shutdown`.
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pub async fn without_shutdown(self) -> crate::Result<Parts<T>> {
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let mut conn = Some(self);
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crate::common::future::poll_fn(move |cx| -> Poll<crate::Result<Parts<T>>> {
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ready!(conn
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.as_mut()
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.expect("client connection polled after completion")
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.poll_without_shutdown(cx))?;
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Poll::Ready(Ok(conn
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.take()
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.expect("client connection missing before completion")
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.into_parts()))
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})
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.await
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}
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}
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/// A builder to configure an HTTP connection.
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///
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/// After setting options, the builder is used to create a handshake future.
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///
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/// **Note**: The default values of options are *not considered stable*. They
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/// are subject to change at any time.
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#[derive(Clone, Debug)]
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pub struct Builder {
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h09_responses: bool,
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h1_parser_config: ParserConfig,
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h1_writev: Option<bool>,
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h1_title_case_headers: bool,
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h1_preserve_header_case: bool,
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h1_max_headers: Option<usize>,
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#[cfg(feature = "ffi")]
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h1_preserve_header_order: bool,
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h1_read_buf_exact_size: Option<usize>,
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h1_max_buf_size: Option<usize>,
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}
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/// Returns a handshake future over some IO.
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///
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/// This is a shortcut for `Builder::new().handshake(io)`.
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/// See [`client::conn`](crate::client::conn) for more.
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pub async fn handshake<T, B>(io: T) -> crate::Result<(SendRequest<B>, Connection<T, B>)>
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where
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T: Read + Write + Unpin,
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B: Body + 'static,
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B::Data: Send,
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B::Error: Into<Box<dyn StdError + Send + Sync>>,
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{
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Builder::new().handshake(io).await
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}
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// ===== impl SendRequest
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impl<B> SendRequest<B> {
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/// Polls to determine whether this sender can be used yet for a request.
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///
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/// If the associated connection is closed, this returns an Error.
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pub fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<crate::Result<()>> {
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self.dispatch.poll_ready(cx)
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}
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/// Waits until the dispatcher is ready.
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///
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/// If the associated connection is closed, this returns an Error.
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pub async fn ready(&mut self) -> crate::Result<()> {
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crate::common::future::poll_fn(|cx| self.poll_ready(cx)).await
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}
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/// Checks if the connection is currently ready to send a request.
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///
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/// # Note
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///
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/// This is mostly a hint. Due to inherent latency of networks, it is
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/// possible that even after checking this is ready, sending a request
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/// may still fail because the connection was closed in the meantime.
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pub fn is_ready(&self) -> bool {
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self.dispatch.is_ready()
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}
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/// Checks if the connection side has been closed.
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pub fn is_closed(&self) -> bool {
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self.dispatch.is_closed()
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}
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}
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impl<B> SendRequest<B>
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where
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B: Body + 'static,
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{
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/// Sends a `Request` on the associated connection.
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///
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/// Returns a future that if successful, yields the `Response`.
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///
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/// `req` must have a `Host` header.
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///
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/// # Uri
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///
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/// The `Uri` of the request is serialized as-is.
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///
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/// - Usually you want origin-form (`/path?query`).
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/// - For sending to an HTTP proxy, you want to send in absolute-form
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/// (`https://hyper.rs/guides`).
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///
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/// This is however not enforced or validated and it is up to the user
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/// of this method to ensure the `Uri` is correct for their intended purpose.
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///
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/// # Cancel safety
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///
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/// Dropping the returned future is the supported way to cancel an
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/// in-flight HTTP/1 request. Because HTTP/1 has no in-protocol way to
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/// abort a single request without affecting the shared connection,
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/// hyper closes the underlying connection when a request future is
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/// dropped before completion. Any subsequent calls on the same
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/// [`SendRequest`] will return a `canceled` error.
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pub fn send_request(
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&mut self,
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req: Request<B>,
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) -> impl Future<Output = crate::Result<Response<IncomingBody>>> {
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let sent = self.dispatch.send(req);
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async move {
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match sent {
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Ok(rx) => match rx.await {
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Ok(Ok(resp)) => Ok(resp),
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Ok(Err(err)) => Err(err),
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// this is definite bug if it happens, but it shouldn't happen!
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Err(_canceled) => panic!("dispatch dropped without returning error"),
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},
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Err(_req) => {
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debug!("connection was not ready");
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Err(crate::Error::new_canceled().with("connection was not ready"))
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}
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}
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}
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}
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/// Sends a `Request` on the associated connection.
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///
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/// Returns a future that if successful, yields the `Response`.
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///
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/// # Error
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///
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/// If there was an error before trying to serialize the request to the
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/// connection, the message will be returned as part of this error.
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pub fn try_send_request(
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&mut self,
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req: Request<B>,
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) -> impl Future<Output = Result<Response<IncomingBody>, TrySendError<Request<B>>>> {
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let sent = self.dispatch.try_send(req);
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async move {
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match sent {
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Ok(rx) => match rx.await {
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Ok(Ok(res)) => Ok(res),
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Ok(Err(err)) => Err(err),
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// this is definite bug if it happens, but it shouldn't happen!
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Err(_) => panic!("dispatch dropped without returning error"),
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},
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Err(req) => {
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debug!("connection was not ready");
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let error = crate::Error::new_canceled().with("connection was not ready");
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Err(TrySendError {
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error,
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message: Some(req),
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})
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}
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}
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}
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}
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}
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impl<B> fmt::Debug for SendRequest<B> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("SendRequest").finish()
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}
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}
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// ===== impl Connection
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impl<T, B> Connection<T, B>
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where
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T: Read + Write + Unpin + Send,
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B: Body + 'static,
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B::Error: Into<Box<dyn StdError + Send + Sync>>,
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{
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/// Enable this connection to support higher-level HTTP upgrades.
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///
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/// See [the `upgrade` module](crate::upgrade) for more.
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pub fn with_upgrades(self) -> upgrades::UpgradeableConnection<T, B> {
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upgrades::UpgradeableConnection { inner: Some(self) }
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}
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}
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impl<T, B> fmt::Debug for Connection<T, B>
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where
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T: Read + Write + fmt::Debug,
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B: Body + 'static,
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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f.debug_struct("Connection").finish()
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}
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}
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impl<T, B> Future for Connection<T, B>
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where
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T: Read + Write + Unpin,
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B: Body + 'static,
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B::Data: Send,
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B::Error: Into<Box<dyn StdError + Send + Sync>>,
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{
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type Output = crate::Result<()>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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match ready!(Pin::new(&mut self.inner).poll(cx))? {
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proto::Dispatched::Shutdown => Poll::Ready(Ok(())),
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proto::Dispatched::Upgrade(pending) => {
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// With no `Send` bound on `I`, we can't try to do
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// upgrades here. In case a user was trying to use
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// `upgrade` with this API, send a special
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// error letting them know about that.
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pending.manual();
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Poll::Ready(Ok(()))
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}
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}
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}
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}
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// ===== impl Builder
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impl Builder {
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/// Creates a new connection builder.
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#[inline]
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pub fn new() -> Builder {
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Builder {
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h09_responses: false,
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h1_writev: None,
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h1_read_buf_exact_size: None,
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h1_parser_config: ParserConfig::default(),
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h1_title_case_headers: false,
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h1_preserve_header_case: false,
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h1_max_headers: None,
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#[cfg(feature = "ffi")]
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h1_preserve_header_order: false,
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h1_max_buf_size: None,
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}
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}
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/// Set whether HTTP/0.9 responses should be tolerated.
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///
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/// Default is false.
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pub fn http09_responses(&mut self, enabled: bool) -> &mut Builder {
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self.h09_responses = enabled;
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self
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}
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/// Set whether HTTP/1 connections will accept spaces between header names
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/// and the colon that follow them in responses.
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///
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/// You probably don't need this, here is what [RFC 7230 Section 3.2.4.] has
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/// to say about it:
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///
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/// > No whitespace is allowed between the header field-name and colon. In
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/// > the past, differences in the handling of such whitespace have led to
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/// > security vulnerabilities in request routing and response handling. A
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/// > server MUST reject any received request message that contains
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/// > whitespace between a header field-name and colon with a response code
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/// > of 400 (Bad Request). A proxy MUST remove any such whitespace from a
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/// > response message before forwarding the message downstream.
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///
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/// Default is false.
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///
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/// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
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pub fn allow_spaces_after_header_name_in_responses(&mut self, enabled: bool) -> &mut Builder {
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self.h1_parser_config
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.allow_spaces_after_header_name_in_responses(enabled);
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self
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}
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/// Set whether HTTP/1 connections will accept obsolete line folding for
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/// header values.
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///
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/// Newline codepoints (`\r` and `\n`) will be transformed to spaces when
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/// parsing.
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///
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/// You probably don't need this, here is what [RFC 7230 Section 3.2.4.] has
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/// to say about it:
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///
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/// > A server that receives an obs-fold in a request message that is not
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/// > within a message/http container MUST either reject the message by
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/// > sending a 400 (Bad Request), preferably with a representation
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/// > explaining that obsolete line folding is unacceptable, or replace
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/// > each received obs-fold with one or more SP octets prior to
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/// > interpreting the field value or forwarding the message downstream.
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///
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/// > A proxy or gateway that receives an obs-fold in a response message
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/// > that is not within a message/http container MUST either discard the
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/// > message and replace it with a 502 (Bad Gateway) response, preferably
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/// > with a representation explaining that unacceptable line folding was
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/// > received, or replace each received obs-fold with one or more SP
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/// > octets prior to interpreting the field value or forwarding the
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/// > message downstream.
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///
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/// > A user agent that receives an obs-fold in a response message that is
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/// > not within a message/http container MUST replace each received
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/// > obs-fold with one or more SP octets prior to interpreting the field
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/// > value.
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///
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/// Default is false.
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///
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/// [RFC 7230 Section 3.2.4.]: https://tools.ietf.org/html/rfc7230#section-3.2.4
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pub fn allow_obsolete_multiline_headers_in_responses(&mut self, enabled: bool) -> &mut Builder {
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self.h1_parser_config
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.allow_obsolete_multiline_headers_in_responses(enabled);
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self
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}
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/// Set whether HTTP/1 connections will silently ignored malformed header lines.
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///
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/// If this is enabled and a header line does not start with a valid header
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/// name, or does not include a colon at all, the line will be silently ignored
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/// and no error will be reported.
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///
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/// Default is false.
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pub fn ignore_invalid_headers_in_responses(&mut self, enabled: bool) -> &mut Builder {
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self.h1_parser_config
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.ignore_invalid_headers_in_responses(enabled);
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self
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}
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/// Set whether HTTP/1 connections should try to use vectored writes,
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/// or always flatten into a single buffer.
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///
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/// Note that setting this to false may mean more copies of body data,
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/// but may also improve performance when an IO transport doesn't
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/// support vectored writes well, such as most TLS implementations.
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///
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/// Setting this to true will force hyper to use queued strategy,
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/// which may eliminate unnecessary cloning on some TLS backends.
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///
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/// Default is `auto`. In this mode hyper will try to guess which
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/// mode to use.
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pub fn writev(&mut self, enabled: bool) -> &mut Builder {
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self.h1_writev = Some(enabled);
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self
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}
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/// Set whether HTTP/1 connections will write header names as title case at
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/// the socket level.
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///
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/// Default is false.
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pub fn title_case_headers(&mut self, enabled: bool) -> &mut Builder {
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self.h1_title_case_headers = enabled;
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self
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}
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/// Set whether to support preserving original header cases.
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///
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/// Currently, this will record the original cases received, and store them
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/// in a private extension on the `Response`. It will also look for and use
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/// such an extension in any provided `Request`.
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///
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/// Since the relevant extension is still private, there is no way to
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/// interact with the original cases. The only effect this can have now is
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/// to forward the cases in a proxy-like fashion.
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///
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/// Default is false.
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pub fn preserve_header_case(&mut self, enabled: bool) -> &mut Builder {
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self.h1_preserve_header_case = enabled;
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self
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}
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/// Set the maximum number of headers.
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///
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/// When a response is received, the parser will reserve a buffer to store headers for optimal
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/// performance.
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///
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/// If client receives more headers than the buffer size, the error "message header too large"
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/// is returned.
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///
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/// Note that headers is allocated on the stack by default, which has higher performance. After
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/// setting this value, headers will be allocated in heap memory, that is, heap memory
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/// allocation will occur for each response, and there will be a performance drop of about 5%.
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///
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/// Default is 100.
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pub fn max_headers(&mut self, val: usize) -> &mut Self {
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self.h1_max_headers = Some(val);
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self
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}
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/// Set whether to support preserving original header order.
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///
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/// Currently, this will record the order in which headers are received, and store this
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/// ordering in a private extension on the `Response`. It will also look for and use
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/// such an extension in any provided `Request`.
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///
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/// Default is false.
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#[cfg(feature = "ffi")]
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pub fn preserve_header_order(&mut self, enabled: bool) -> &mut Builder {
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self.h1_preserve_header_order = enabled;
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self
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}
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/// 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 super::{Connection, Context, Future, Parts, Pin, Poll, Read, StdError, Write};
|
|
use crate::body::Body;
|
|
use crate::proto::Dispatched;
|
|
use crate::upgrade::Upgraded;
|
|
use futures_core::ready;
|
|
// 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()
|
|
.expect("upgradeable client connection polled after upgrade")
|
|
.inner,
|
|
)
|
|
.poll(cx))
|
|
{
|
|
Ok(Dispatched::Shutdown) => Poll::Ready(Ok(())),
|
|
Ok(Dispatched::Upgrade(pending)) => {
|
|
let Parts { io, read_buf } = self
|
|
.inner
|
|
.take()
|
|
.expect("upgradeable client connection missing after upgrade")
|
|
.into_parts();
|
|
pending.fulfill(Upgraded::new(io, read_buf));
|
|
Poll::Ready(Ok(()))
|
|
}
|
|
Err(e) => Poll::Ready(Err(e)),
|
|
}
|
|
}
|
|
}
|
|
}
|