Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

16 files changed, 1541 insertions, 0 deletions

diff --git a/third_party/rust/http-body/.cargo-checksum.json b/third_party/rust/http-body/.cargo-checksum.json
new file mode 100644
index 0000000000..dd8581af9b
--- /dev/null
+++ b/third_party/rust/http-body/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"CHANGELOG.md":"b225eb6c706ab729255efa55603551151216b9e5f96dd722469ff5f28d843338","Cargo.toml":"037a31b6a59c860c5fe9860ba07b91f0141311453af66275b6d1336db2b1b1fb","LICENSE":"0345e2b98685e3807fd802a2478085dcae35023e3da59b5a00f712504314d83a","README.md":"0f90f61ee419eefd4104005ef6900445fafce9a710dd1989463f3cebaf0fafe8","src/combinators/box_body.rs":"d27dfa9f289c9c8d1fe714415fb5df5bdaafafb80a5cff66fbbe720841e806bf","src/combinators/map_data.rs":"3063f44d1318feeec639eff6544e7fb91ad9abf9a295770af4cc69b48a691796","src/combinators/map_err.rs":"9db485a5904579147673ac7f9f347e322d283d95a421daaf5541d048045eec7e","src/combinators/mod.rs":"c9e32f64ab2f4866d14256fff4256ba61d4c1bcfaf2748754c561de3abe1eccd","src/empty.rs":"3e44cee68410101cb8bf88c0de504885075c084357e83bcd3a6761ba5c7c58d2","src/full.rs":"efcbf6831d32271170e2ed86c328bfb887aec0c93689f1218ab5a18c319b0fa8","src/lib.rs":"140ff217ecf7e361b9f083dc664f1d65be176b235a71fdb1e8031eafda989a38","src/limited.rs":"485fc1c58bba29d2c7afdb4a032cd0e3c3578979ccd71f7459ddcd67e0f16077","src/next.rs":"d6863067b20c4bb42dced5c17bd954816b1338ce53e8d34ab81dbe240a1601cf","src/size_hint.rs":"017ed58c59b446b93aa4922e35b596490bf8f03af37c631610cc6576f1c21439","tests/is_end_stream.rs":"3a66d80d064f8a447bfa9fd212c2f91855604b1b41f554da3a029bc4a5be3a7e"},"package":"d5f38f16d184e36f2408a55281cd658ecbd3ca05cce6d6510a176eca393e26d1"}
\ No newline at end of file
diff --git a/third_party/rust/http-body/CHANGELOG.md b/third_party/rust/http-body/CHANGELOG.md
new file mode 100644
index 0000000000..4708a20075
--- /dev/null
+++ b/third_party/rust/http-body/CHANGELOG.md
@@ -0,0 +1,62 @@
+# Unreleased
+
+None.
+
+# 0.4.5 (May 20, 2022)
+
+- Add `String` impl for `Body`.
+- Add `Limited` body implementation.
+
+# 0.4.4 (October 22, 2021)
+
+- Add `UnsyncBoxBody` and `Body::boxed_unsync`.
+
+# 0.4.3 (August 8, 2021)
+
+- Implement `Default` for `BoxBody`.
+
+# 0.4.2 (May 8, 2021)
+
+- Correctly override `Body::size_hint` and `Body::is_end_stream` for `Empty`.
+- Add `Full` which is a body that consists of a single chunk.
+
+# 0.4.1 (March 18, 2021)
+
+- Add combinators to `Body`:
+  - `map_data`: Change the `Data` chunks produced by the body.
+  - `map_err`: Change the `Error`s produced by the body.
+  - `boxed`: Convert the `Body` into a boxed trait object.
+- Add `Empty`.
+
+# 0.4.0 (December 23, 2020)
+
+- Update `bytes` to v1.0.
+
+# 0.3.1 (December 13, 2019)
+
+- Implement `Body` for `http::Request<impl Body>` and `http::Response<impl Body>`.
+
+# 0.3.0 (December 4, 2019)
+
+- Rename `next` combinator to `data`.
+
+# 0.2.0 (December 3, 2019)
+
+- Update `http` to v0.2.
+- Update `bytes` to v0.5.
+
+# 0.2.0-alpha.3 (October 1, 2019)
+
+- Fix `Body` to be object-safe.
+
+# 0.2.0-alpha.2 (October 1, 2019)
+
+- Add `next` and `trailers` combinator methods.
+
+# 0.2.0-alpha.1 (August 20, 2019)
+
+- Update to use `Pin` in `poll_data` and `poll_trailers`.
+
+# 0.1.0 (May 7, 2019)
+
+- Initial release
diff --git a/third_party/rust/http-body/Cargo.toml b/third_party/rust/http-body/Cargo.toml
new file mode 100644
index 0000000000..202ce7de84
--- /dev/null
+++ b/third_party/rust/http-body/Cargo.toml
@@ -0,0 +1,45 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "http-body"
+version = "0.4.5"
+authors = [
+    "Carl Lerche <me@carllerche.com>",
+    "Lucio Franco <luciofranco14@gmail.com>",
+    "Sean McArthur <sean@seanmonstar.com>",
+]
+description = """
+Trait representing an asynchronous, streaming, HTTP request or response body.
+"""
+documentation = "https://docs.rs/http-body"
+readme = "README.md"
+keywords = ["http"]
+categories = ["web-programming"]
+license = "MIT"
+repository = "https://github.com/hyperium/http-body"
+
+[dependencies.bytes]
+version = "1"
+
+[dependencies.http]
+version = "0.2"
+
+[dependencies.pin-project-lite]
+version = "0.2"
+
+[dev-dependencies.tokio]
+version = "1"
+features = [
+    "macros",
+    "rt",
+]
diff --git a/third_party/rust/http-body/LICENSE b/third_party/rust/http-body/LICENSE
new file mode 100644
index 0000000000..27b08f2874
--- /dev/null
+++ b/third_party/rust/http-body/LICENSE
@@ -0,0 +1,25 @@
+Copyright (c) 2019 Hyper Contributors
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/http-body/README.md b/third_party/rust/http-body/README.md
new file mode 100644
index 0000000000..c82ba29056
--- /dev/null
+++ b/third_party/rust/http-body/README.md
@@ -0,0 +1,27 @@
+# HTTP Body
+
+A trait representing asynchronous operations on an HTTP body.
+
+[![crates.io][crates-badge]][crates-url]
+[![documentation][docs-badge]][docs-url]
+[![MIT License][mit-badge]][mit-url]
+[![CI Status][ci-badge]][ci-url]
+
+[crates-badge]: https://img.shields.io/crates/v/http-body.svg
+[crates-url]: https://crates.io/crates/http-body
+[docs-badge]: https://docs.rs/http-body/badge.svg
+[docs-url]: https://docs.rs/http-body
+[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
+[mit-url]: LICENSE
+[ci-badge]: https://github.com/hyperium/http-body/workflows/CI/badge.svg
+[ci-url]: https://github.com/hyperium/http-body/actions?query=workflow%3ACI
+
+## License
+
+This project is licensed under the [MIT license](LICENSE).
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in `http-body` by you, shall be licensed as MIT, without any additional
+terms or conditions.
diff --git a/third_party/rust/http-body/src/combinators/box_body.rs b/third_party/rust/http-body/src/combinators/box_body.rs
new file mode 100644
index 0000000000..97c8313fd7
--- /dev/null
+++ b/third_party/rust/http-body/src/combinators/box_body.rs
@@ -0,0 +1,134 @@
+use crate::Body;
+use bytes::Buf;
+use std::{
+    fmt,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+/// A boxed [`Body`] trait object.
+pub struct BoxBody<D, E> {
+    inner: Pin<Box<dyn Body<Data = D, Error = E> + Send + Sync + 'static>>,
+}
+
+/// A boxed [`Body`] trait object that is !Sync.
+pub struct UnsyncBoxBody<D, E> {
+    inner: Pin<Box<dyn Body<Data = D, Error = E> + Send + 'static>>,
+}
+
+impl<D, E> BoxBody<D, E> {
+    /// Create a new `BoxBody`.
+    pub fn new<B>(body: B) -> Self
+    where
+        B: Body<Data = D, Error = E> + Send + Sync + 'static,
+        D: Buf,
+    {
+        Self {
+            inner: Box::pin(body),
+        }
+    }
+}
+
+impl<D, E> fmt::Debug for BoxBody<D, E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("BoxBody").finish()
+    }
+}
+
+impl<D, E> Body for BoxBody<D, E>
+where
+    D: Buf,
+{
+    type Data = D;
+    type Error = E;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        self.inner.as_mut().poll_data(cx)
+    }
+
+    fn poll_trailers(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
+        self.inner.as_mut().poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+
+    fn size_hint(&self) -> crate::SizeHint {
+        self.inner.size_hint()
+    }
+}
+
+impl<D, E> Default for BoxBody<D, E>
+where
+    D: Buf + 'static,
+{
+    fn default() -> Self {
+        BoxBody::new(crate::Empty::new().map_err(|err| match err {}))
+    }
+}
+
+// === UnsyncBoxBody ===
+impl<D, E> UnsyncBoxBody<D, E> {
+    /// Create a new `BoxBody`.
+    pub fn new<B>(body: B) -> Self
+    where
+        B: Body<Data = D, Error = E> + Send + 'static,
+        D: Buf,
+    {
+        Self {
+            inner: Box::pin(body),
+        }
+    }
+}
+
+impl<D, E> fmt::Debug for UnsyncBoxBody<D, E> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("UnsyncBoxBody").finish()
+    }
+}
+
+impl<D, E> Body for UnsyncBoxBody<D, E>
+where
+    D: Buf,
+{
+    type Data = D;
+    type Error = E;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        self.inner.as_mut().poll_data(cx)
+    }
+
+    fn poll_trailers(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
+        self.inner.as_mut().poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+
+    fn size_hint(&self) -> crate::SizeHint {
+        self.inner.size_hint()
+    }
+}
+
+impl<D, E> Default for UnsyncBoxBody<D, E>
+where
+    D: Buf + 'static,
+{
+    fn default() -> Self {
+        UnsyncBoxBody::new(crate::Empty::new().map_err(|err| match err {}))
+    }
+}
diff --git a/third_party/rust/http-body/src/combinators/map_data.rs b/third_party/rust/http-body/src/combinators/map_data.rs
new file mode 100644
index 0000000000..6d9c5a8964
--- /dev/null
+++ b/third_party/rust/http-body/src/combinators/map_data.rs
@@ -0,0 +1,94 @@
+use crate::Body;
+use bytes::Buf;
+use pin_project_lite::pin_project;
+use std::{
+    any::type_name,
+    fmt,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+pin_project! {
+    /// Body returned by the [`map_data`] combinator.
+    ///
+    /// [`map_data`]: crate::util::BodyExt::map_data
+    #[derive(Clone, Copy)]
+    pub struct MapData<B, F> {
+        #[pin]
+        inner: B,
+        f: F
+    }
+}
+
+impl<B, F> MapData<B, F> {
+    #[inline]
+    pub(crate) fn new(body: B, f: F) -> Self {
+        Self { inner: body, f }
+    }
+
+    /// Get a reference to the inner body
+    pub fn get_ref(&self) -> &B {
+        &self.inner
+    }
+
+    /// Get a mutable reference to the inner body
+    pub fn get_mut(&mut self) -> &mut B {
+        &mut self.inner
+    }
+
+    /// Get a pinned mutable reference to the inner body
+    pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut B> {
+        self.project().inner
+    }
+
+    /// Consume `self`, returning the inner body
+    pub fn into_inner(self) -> B {
+        self.inner
+    }
+}
+
+impl<B, F, B2> Body for MapData<B, F>
+where
+    B: Body,
+    F: FnMut(B::Data) -> B2,
+    B2: Buf,
+{
+    type Data = B2;
+    type Error = B::Error;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        let this = self.project();
+        match this.inner.poll_data(cx) {
+            Poll::Pending => Poll::Pending,
+            Poll::Ready(None) => Poll::Ready(None),
+            Poll::Ready(Some(Ok(data))) => Poll::Ready(Some(Ok((this.f)(data)))),
+            Poll::Ready(Some(Err(err))) => Poll::Ready(Some(Err(err))),
+        }
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
+        self.project().inner.poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+}
+
+impl<B, F> fmt::Debug for MapData<B, F>
+where
+    B: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("MapData")
+            .field("inner", &self.inner)
+            .field("f", &type_name::<F>())
+            .finish()
+    }
+}
diff --git a/third_party/rust/http-body/src/combinators/map_err.rs b/third_party/rust/http-body/src/combinators/map_err.rs
new file mode 100644
index 0000000000..c77168deb5
--- /dev/null
+++ b/third_party/rust/http-body/src/combinators/map_err.rs
@@ -0,0 +1,97 @@
+use crate::Body;
+use pin_project_lite::pin_project;
+use std::{
+    any::type_name,
+    fmt,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+pin_project! {
+    /// Body returned by the [`map_err`] combinator.
+    ///
+    /// [`map_err`]: crate::util::BodyExt::map_err
+    #[derive(Clone, Copy)]
+    pub struct MapErr<B, F> {
+        #[pin]
+        inner: B,
+        f: F
+    }
+}
+
+impl<B, F> MapErr<B, F> {
+    #[inline]
+    pub(crate) fn new(body: B, f: F) -> Self {
+        Self { inner: body, f }
+    }
+
+    /// Get a reference to the inner body
+    pub fn get_ref(&self) -> &B {
+        &self.inner
+    }
+
+    /// Get a mutable reference to the inner body
+    pub fn get_mut(&mut self) -> &mut B {
+        &mut self.inner
+    }
+
+    /// Get a pinned mutable reference to the inner body
+    pub fn get_pin_mut(self: Pin<&mut Self>) -> Pin<&mut B> {
+        self.project().inner
+    }
+
+    /// Consume `self`, returning the inner body
+    pub fn into_inner(self) -> B {
+        self.inner
+    }
+}
+
+impl<B, F, E> Body for MapErr<B, F>
+where
+    B: Body,
+    F: FnMut(B::Error) -> E,
+{
+    type Data = B::Data;
+    type Error = E;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        let this = self.project();
+        match this.inner.poll_data(cx) {
+            Poll::Pending => Poll::Pending,
+            Poll::Ready(None) => Poll::Ready(None),
+            Poll::Ready(Some(Ok(data))) => Poll::Ready(Some(Ok(data))),
+            Poll::Ready(Some(Err(err))) => Poll::Ready(Some(Err((this.f)(err)))),
+        }
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<http::HeaderMap>, Self::Error>> {
+        let this = self.project();
+        this.inner.poll_trailers(cx).map_err(this.f)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+
+    fn size_hint(&self) -> crate::SizeHint {
+        self.inner.size_hint()
+    }
+}
+
+impl<B, F> fmt::Debug for MapErr<B, F>
+where
+    B: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("MapErr")
+            .field("inner", &self.inner)
+            .field("f", &type_name::<F>())
+            .finish()
+    }
+}
diff --git a/third_party/rust/http-body/src/combinators/mod.rs b/third_party/rust/http-body/src/combinators/mod.rs
new file mode 100644
index 0000000000..c52f367554
--- /dev/null
+++ b/third_party/rust/http-body/src/combinators/mod.rs
@@ -0,0 +1,11 @@
+//! Combinators for the `Body` trait.
+
+mod box_body;
+mod map_data;
+mod map_err;
+
+pub use self::{
+    box_body::{BoxBody, UnsyncBoxBody},
+    map_data::MapData,
+    map_err::MapErr,
+};
diff --git a/third_party/rust/http-body/src/empty.rs b/third_party/rust/http-body/src/empty.rs
new file mode 100644
index 0000000000..7d63ceb054
--- /dev/null
+++ b/third_party/rust/http-body/src/empty.rs
@@ -0,0 +1,75 @@
+use super::{Body, SizeHint};
+use bytes::Buf;
+use http::HeaderMap;
+use std::{
+    convert::Infallible,
+    fmt,
+    marker::PhantomData,
+    pin::Pin,
+    task::{Context, Poll},
+};
+
+/// A body that is always empty.
+pub struct Empty<D> {
+    _marker: PhantomData<fn() -> D>,
+}
+
+impl<D> Empty<D> {
+    /// Create a new `Empty`.
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+impl<D: Buf> Body for Empty<D> {
+    type Data = D;
+    type Error = Infallible;
+
+    #[inline]
+    fn poll_data(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        Poll::Ready(None)
+    }
+
+    #[inline]
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Poll::Ready(Ok(None))
+    }
+
+    fn is_end_stream(&self) -> bool {
+        true
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        SizeHint::with_exact(0)
+    }
+}
+
+impl<D> fmt::Debug for Empty<D> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Empty").finish()
+    }
+}
+
+impl<D> Default for Empty<D> {
+    fn default() -> Self {
+        Self {
+            _marker: PhantomData,
+        }
+    }
+}
+
+impl<D> Clone for Empty<D> {
+    fn clone(&self) -> Self {
+        Self {
+            _marker: PhantomData,
+        }
+    }
+}
+
+impl<D> Copy for Empty<D> {}
diff --git a/third_party/rust/http-body/src/full.rs b/third_party/rust/http-body/src/full.rs
new file mode 100644
index 0000000000..f1d063b0ae
--- /dev/null
+++ b/third_party/rust/http-body/src/full.rs
@@ -0,0 +1,151 @@
+use crate::{Body, SizeHint};
+use bytes::{Buf, Bytes};
+use http::HeaderMap;
+use pin_project_lite::pin_project;
+use std::borrow::Cow;
+use std::convert::{Infallible, TryFrom};
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+pin_project! {
+    /// A body that consists of a single chunk.
+    #[derive(Clone, Copy, Debug)]
+    pub struct Full<D> {
+        data: Option<D>,
+    }
+}
+
+impl<D> Full<D>
+where
+    D: Buf,
+{
+    /// Create a new `Full`.
+    pub fn new(data: D) -> Self {
+        let data = if data.has_remaining() {
+            Some(data)
+        } else {
+            None
+        };
+        Full { data }
+    }
+}
+
+impl<D> Body for Full<D>
+where
+    D: Buf,
+{
+    type Data = D;
+    type Error = Infallible;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<D, Self::Error>>> {
+        Poll::Ready(self.data.take().map(Ok))
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Poll::Ready(Ok(None))
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.data.is_none()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.data
+            .as_ref()
+            .map(|data| SizeHint::with_exact(u64::try_from(data.remaining()).unwrap()))
+            .unwrap_or_else(|| SizeHint::with_exact(0))
+    }
+}
+
+impl<D> Default for Full<D>
+where
+    D: Buf,
+{
+    /// Create an empty `Full`.
+    fn default() -> Self {
+        Full { data: None }
+    }
+}
+
+impl<D> From<Bytes> for Full<D>
+where
+    D: Buf + From<Bytes>,
+{
+    fn from(bytes: Bytes) -> Self {
+        Full::new(D::from(bytes))
+    }
+}
+
+impl<D> From<Vec<u8>> for Full<D>
+where
+    D: Buf + From<Vec<u8>>,
+{
+    fn from(vec: Vec<u8>) -> Self {
+        Full::new(D::from(vec))
+    }
+}
+
+impl<D> From<&'static [u8]> for Full<D>
+where
+    D: Buf + From<&'static [u8]>,
+{
+    fn from(slice: &'static [u8]) -> Self {
+        Full::new(D::from(slice))
+    }
+}
+
+impl<D, B> From<Cow<'static, B>> for Full<D>
+where
+    D: Buf + From<&'static B> + From<B::Owned>,
+    B: ToOwned + ?Sized,
+{
+    fn from(cow: Cow<'static, B>) -> Self {
+        match cow {
+            Cow::Borrowed(b) => Full::new(D::from(b)),
+            Cow::Owned(o) => Full::new(D::from(o)),
+        }
+    }
+}
+
+impl<D> From<String> for Full<D>
+where
+    D: Buf + From<String>,
+{
+    fn from(s: String) -> Self {
+        Full::new(D::from(s))
+    }
+}
+
+impl<D> From<&'static str> for Full<D>
+where
+    D: Buf + From<&'static str>,
+{
+    fn from(slice: &'static str) -> Self {
+        Full::new(D::from(slice))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn full_returns_some() {
+        let mut full = Full::new(&b"hello"[..]);
+        assert_eq!(full.size_hint().exact(), Some(b"hello".len() as u64));
+        assert_eq!(full.data().await, Some(Ok(&b"hello"[..])));
+        assert!(full.data().await.is_none());
+    }
+
+    #[tokio::test]
+    async fn empty_full_returns_none() {
+        assert!(Full::<&[u8]>::default().data().await.is_none());
+        assert!(Full::new(&b""[..]).data().await.is_none());
+    }
+}
diff --git a/third_party/rust/http-body/src/lib.rs b/third_party/rust/http-body/src/lib.rs
new file mode 100644
index 0000000000..84efd9169f
--- /dev/null
+++ b/third_party/rust/http-body/src/lib.rs
@@ -0,0 +1,324 @@
+#![doc(html_root_url = "https://docs.rs/http-body/0.4.5")]
+#![deny(
+    missing_debug_implementations,
+    missing_docs,
+    unreachable_pub,
+    broken_intra_doc_links
+)]
+#![cfg_attr(test, deny(warnings))]
+
+//! Asynchronous HTTP request or response body.
+//!
+//! See [`Body`] for more details.
+//!
+//! [`Body`]: trait.Body.html
+
+mod empty;
+mod full;
+mod limited;
+mod next;
+mod size_hint;
+
+pub mod combinators;
+
+pub use self::empty::Empty;
+pub use self::full::Full;
+pub use self::limited::{LengthLimitError, Limited};
+pub use self::next::{Data, Trailers};
+pub use self::size_hint::SizeHint;
+
+use self::combinators::{BoxBody, MapData, MapErr, UnsyncBoxBody};
+use bytes::{Buf, Bytes};
+use http::HeaderMap;
+use std::convert::Infallible;
+use std::ops;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+/// Trait representing a streaming body of a Request or Response.
+///
+/// Data is streamed via the `poll_data` function, which asynchronously yields `T: Buf` values. The
+/// `size_hint` function provides insight into the total number of bytes that will be streamed.
+///
+/// The `poll_trailers` function returns an optional set of trailers used to finalize the request /
+/// response exchange. This is mostly used when using the HTTP/2.0 protocol.
+///
+pub trait Body {
+    /// Values yielded by the `Body`.
+    type Data: Buf;
+
+    /// The error type this `Body` might generate.
+    type Error;
+
+    /// Attempt to pull out the next data buffer of this stream.
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>>;
+
+    /// Poll for an optional **single** `HeaderMap` of trailers.
+    ///
+    /// This function should only be called once `poll_data` returns `None`.
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>>;
+
+    /// Returns `true` when the end of stream has been reached.
+    ///
+    /// An end of stream means that both `poll_data` and `poll_trailers` will
+    /// return `None`.
+    ///
+    /// A return value of `false` **does not** guarantee that a value will be
+    /// returned from `poll_stream` or `poll_trailers`.
+    fn is_end_stream(&self) -> bool {
+        false
+    }
+
+    /// Returns the bounds on the remaining length of the stream.
+    ///
+    /// When the **exact** remaining length of the stream is known, the upper bound will be set and
+    /// will equal the lower bound.
+    fn size_hint(&self) -> SizeHint {
+        SizeHint::default()
+    }
+
+    /// Returns future that resolves to next data chunk, if any.
+    fn data(&mut self) -> Data<'_, Self>
+    where
+        Self: Unpin + Sized,
+    {
+        Data(self)
+    }
+
+    /// Returns future that resolves to trailers, if any.
+    fn trailers(&mut self) -> Trailers<'_, Self>
+    where
+        Self: Unpin + Sized,
+    {
+        Trailers(self)
+    }
+
+    /// Maps this body's data value to a different value.
+    fn map_data<F, B>(self, f: F) -> MapData<Self, F>
+    where
+        Self: Sized,
+        F: FnMut(Self::Data) -> B,
+        B: Buf,
+    {
+        MapData::new(self, f)
+    }
+
+    /// Maps this body's error value to a different value.
+    fn map_err<F, E>(self, f: F) -> MapErr<Self, F>
+    where
+        Self: Sized,
+        F: FnMut(Self::Error) -> E,
+    {
+        MapErr::new(self, f)
+    }
+
+    /// Turn this body into a boxed trait object.
+    fn boxed(self) -> BoxBody<Self::Data, Self::Error>
+    where
+        Self: Sized + Send + Sync + 'static,
+    {
+        BoxBody::new(self)
+    }
+
+    /// Turn this body into a boxed trait object that is !Sync.
+    fn boxed_unsync(self) -> UnsyncBoxBody<Self::Data, Self::Error>
+    where
+        Self: Sized + Send + 'static,
+    {
+        UnsyncBoxBody::new(self)
+    }
+}
+
+impl<T: Body + Unpin + ?Sized> Body for &mut T {
+    type Data = T::Data;
+    type Error = T::Error;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        Pin::new(&mut **self).poll_data(cx)
+    }
+
+    fn poll_trailers(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Pin::new(&mut **self).poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        Pin::new(&**self).is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        Pin::new(&**self).size_hint()
+    }
+}
+
+impl<P> Body for Pin<P>
+where
+    P: Unpin + ops::DerefMut,
+    P::Target: Body,
+{
+    type Data = <<P as ops::Deref>::Target as Body>::Data;
+    type Error = <<P as ops::Deref>::Target as Body>::Error;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        Pin::get_mut(self).as_mut().poll_data(cx)
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Pin::get_mut(self).as_mut().poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.as_ref().is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.as_ref().size_hint()
+    }
+}
+
+impl<T: Body + Unpin + ?Sized> Body for Box<T> {
+    type Data = T::Data;
+    type Error = T::Error;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        Pin::new(&mut **self).poll_data(cx)
+    }
+
+    fn poll_trailers(
+        mut self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Pin::new(&mut **self).poll_trailers(cx)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.as_ref().is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.as_ref().size_hint()
+    }
+}
+
+impl<B: Body> Body for http::Request<B> {
+    type Data = B::Data;
+    type Error = B::Error;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        unsafe {
+            self.map_unchecked_mut(http::Request::body_mut)
+                .poll_data(cx)
+        }
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        unsafe {
+            self.map_unchecked_mut(http::Request::body_mut)
+                .poll_trailers(cx)
+        }
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.body().is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.body().size_hint()
+    }
+}
+
+impl<B: Body> Body for http::Response<B> {
+    type Data = B::Data;
+    type Error = B::Error;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        unsafe {
+            self.map_unchecked_mut(http::Response::body_mut)
+                .poll_data(cx)
+        }
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        unsafe {
+            self.map_unchecked_mut(http::Response::body_mut)
+                .poll_trailers(cx)
+        }
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.body().is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.body().size_hint()
+    }
+}
+
+impl Body for String {
+    type Data = Bytes;
+    type Error = Infallible;
+
+    fn poll_data(
+        mut self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        if !self.is_empty() {
+            let s = std::mem::take(&mut *self);
+            Poll::Ready(Some(Ok(s.into_bytes().into())))
+        } else {
+            Poll::Ready(None)
+        }
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Poll::Ready(Ok(None))
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.is_empty()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        SizeHint::with_exact(self.len() as u64)
+    }
+}
+
+#[cfg(test)]
+fn _assert_bounds() {
+    fn can_be_trait_object(_: &dyn Body<Data = std::io::Cursor<Vec<u8>>, Error = std::io::Error>) {}
+}
diff --git a/third_party/rust/http-body/src/limited.rs b/third_party/rust/http-body/src/limited.rs
new file mode 100644
index 0000000000..a40add91f9
--- /dev/null
+++ b/third_party/rust/http-body/src/limited.rs
@@ -0,0 +1,299 @@
+use crate::{Body, SizeHint};
+use bytes::Buf;
+use http::HeaderMap;
+use pin_project_lite::pin_project;
+use std::error::Error;
+use std::fmt;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+pin_project! {
+    /// A length limited body.
+    ///
+    /// This body will return an error if more than the configured number
+    /// of bytes are returned on polling the wrapped body.
+    #[derive(Clone, Copy, Debug)]
+    pub struct Limited<B> {
+        remaining: usize,
+        #[pin]
+        inner: B,
+    }
+}
+
+impl<B> Limited<B> {
+    /// Create a new `Limited`.
+    pub fn new(inner: B, limit: usize) -> Self {
+        Self {
+            remaining: limit,
+            inner,
+        }
+    }
+}
+
+impl<B> Body for Limited<B>
+where
+    B: Body,
+    B::Error: Into<Box<dyn Error + Send + Sync>>,
+{
+    type Data = B::Data;
+    type Error = Box<dyn Error + Send + Sync>;
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        let this = self.project();
+        let res = match this.inner.poll_data(cx) {
+            Poll::Pending => return Poll::Pending,
+            Poll::Ready(None) => None,
+            Poll::Ready(Some(Ok(data))) => {
+                if data.remaining() > *this.remaining {
+                    *this.remaining = 0;
+                    Some(Err(LengthLimitError.into()))
+                } else {
+                    *this.remaining -= data.remaining();
+                    Some(Ok(data))
+                }
+            }
+            Poll::Ready(Some(Err(err))) => Some(Err(err.into())),
+        };
+
+        Poll::Ready(res)
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        let this = self.project();
+        let res = match this.inner.poll_trailers(cx) {
+            Poll::Pending => return Poll::Pending,
+            Poll::Ready(Ok(data)) => Ok(data),
+            Poll::Ready(Err(err)) => Err(err.into()),
+        };
+
+        Poll::Ready(res)
+    }
+
+    fn is_end_stream(&self) -> bool {
+        self.inner.is_end_stream()
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        use std::convert::TryFrom;
+        match u64::try_from(self.remaining) {
+            Ok(n) => {
+                let mut hint = self.inner.size_hint();
+                if hint.lower() >= n {
+                    hint.set_exact(n)
+                } else if let Some(max) = hint.upper() {
+                    hint.set_upper(n.min(max))
+                } else {
+                    hint.set_upper(n)
+                }
+                hint
+            }
+            Err(_) => self.inner.size_hint(),
+        }
+    }
+}
+
+/// An error returned when body length exceeds the configured limit.
+#[derive(Debug)]
+#[non_exhaustive]
+pub struct LengthLimitError;
+
+impl fmt::Display for LengthLimitError {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("length limit exceeded")
+    }
+}
+
+impl Error for LengthLimitError {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::Full;
+    use bytes::Bytes;
+    use std::convert::Infallible;
+
+    #[tokio::test]
+    async fn read_for_body_under_limit_returns_data() {
+        const DATA: &[u8] = b"testing";
+        let inner = Full::new(Bytes::from(DATA));
+        let body = &mut Limited::new(inner, 8);
+
+        let mut hint = SizeHint::new();
+        hint.set_upper(7);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let data = body.data().await.unwrap().unwrap();
+        assert_eq!(data, DATA);
+        hint.set_upper(0);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        assert!(matches!(body.data().await, None));
+    }
+
+    #[tokio::test]
+    async fn read_for_body_over_limit_returns_error() {
+        const DATA: &[u8] = b"testing a string that is too long";
+        let inner = Full::new(Bytes::from(DATA));
+        let body = &mut Limited::new(inner, 8);
+
+        let mut hint = SizeHint::new();
+        hint.set_upper(8);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let error = body.data().await.unwrap().unwrap_err();
+        assert!(matches!(error.downcast_ref(), Some(LengthLimitError)));
+    }
+
+    struct Chunky(&'static [&'static [u8]]);
+
+    impl Body for Chunky {
+        type Data = &'static [u8];
+        type Error = Infallible;
+
+        fn poll_data(
+            self: Pin<&mut Self>,
+            _cx: &mut Context<'_>,
+        ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+            let mut this = self;
+            match this.0.split_first().map(|(&head, tail)| (Ok(head), tail)) {
+                Some((data, new_tail)) => {
+                    this.0 = new_tail;
+
+                    Poll::Ready(Some(data))
+                }
+                None => Poll::Ready(None),
+            }
+        }
+
+        fn poll_trailers(
+            self: Pin<&mut Self>,
+            _cx: &mut Context<'_>,
+        ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+            Poll::Ready(Ok(Some(HeaderMap::new())))
+        }
+    }
+
+    #[tokio::test]
+    async fn read_for_chunked_body_around_limit_returns_first_chunk_but_returns_error_on_over_limit_chunk(
+    ) {
+        const DATA: &[&[u8]] = &[b"testing ", b"a string that is too long"];
+        let inner = Chunky(DATA);
+        let body = &mut Limited::new(inner, 8);
+
+        let mut hint = SizeHint::new();
+        hint.set_upper(8);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let data = body.data().await.unwrap().unwrap();
+        assert_eq!(data, DATA[0]);
+        hint.set_upper(0);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let error = body.data().await.unwrap().unwrap_err();
+        assert!(matches!(error.downcast_ref(), Some(LengthLimitError)));
+    }
+
+    #[tokio::test]
+    async fn read_for_chunked_body_over_limit_on_first_chunk_returns_error() {
+        const DATA: &[&[u8]] = &[b"testing a string", b" that is too long"];
+        let inner = Chunky(DATA);
+        let body = &mut Limited::new(inner, 8);
+
+        let mut hint = SizeHint::new();
+        hint.set_upper(8);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let error = body.data().await.unwrap().unwrap_err();
+        assert!(matches!(error.downcast_ref(), Some(LengthLimitError)));
+    }
+
+    #[tokio::test]
+    async fn read_for_chunked_body_under_limit_is_okay() {
+        const DATA: &[&[u8]] = &[b"test", b"ing!"];
+        let inner = Chunky(DATA);
+        let body = &mut Limited::new(inner, 8);
+
+        let mut hint = SizeHint::new();
+        hint.set_upper(8);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let data = body.data().await.unwrap().unwrap();
+        assert_eq!(data, DATA[0]);
+        hint.set_upper(4);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        let data = body.data().await.unwrap().unwrap();
+        assert_eq!(data, DATA[1]);
+        hint.set_upper(0);
+        assert_eq!(body.size_hint().upper(), hint.upper());
+
+        assert!(matches!(body.data().await, None));
+    }
+
+    #[tokio::test]
+    async fn read_for_trailers_propagates_inner_trailers() {
+        const DATA: &[&[u8]] = &[b"test", b"ing!"];
+        let inner = Chunky(DATA);
+        let body = &mut Limited::new(inner, 8);
+        let trailers = body.trailers().await.unwrap();
+        assert_eq!(trailers, Some(HeaderMap::new()))
+    }
+
+    #[derive(Debug)]
+    enum ErrorBodyError {
+        Data,
+        Trailers,
+    }
+
+    impl fmt::Display for ErrorBodyError {
+        fn fmt(&self, _f: &mut fmt::Formatter) -> fmt::Result {
+            Ok(())
+        }
+    }
+
+    impl Error for ErrorBodyError {}
+
+    struct ErrorBody;
+
+    impl Body for ErrorBody {
+        type Data = &'static [u8];
+        type Error = ErrorBodyError;
+
+        fn poll_data(
+            self: Pin<&mut Self>,
+            _cx: &mut Context<'_>,
+        ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+            Poll::Ready(Some(Err(ErrorBodyError::Data)))
+        }
+
+        fn poll_trailers(
+            self: Pin<&mut Self>,
+            _cx: &mut Context<'_>,
+        ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+            Poll::Ready(Err(ErrorBodyError::Trailers))
+        }
+    }
+
+    #[tokio::test]
+    async fn read_for_body_returning_error_propagates_error() {
+        let body = &mut Limited::new(ErrorBody, 8);
+        let error = body.data().await.unwrap().unwrap_err();
+        assert!(matches!(error.downcast_ref(), Some(ErrorBodyError::Data)));
+    }
+
+    #[tokio::test]
+    async fn trailers_for_body_returning_error_propagates_error() {
+        let body = &mut Limited::new(ErrorBody, 8);
+        let error = body.trailers().await.unwrap_err();
+        assert!(matches!(
+            error.downcast_ref(),
+            Some(ErrorBodyError::Trailers)
+        ));
+    }
+}
diff --git a/third_party/rust/http-body/src/next.rs b/third_party/rust/http-body/src/next.rs
new file mode 100644
index 0000000000..fc87ffcf01
--- /dev/null
+++ b/third_party/rust/http-body/src/next.rs
@@ -0,0 +1,31 @@
+use crate::Body;
+
+use core::future::Future;
+use core::pin::Pin;
+use core::task;
+
+#[must_use = "futures don't do anything unless polled"]
+#[derive(Debug)]
+/// Future that resolves to the next data chunk from `Body`
+pub struct Data<'a, T: ?Sized>(pub(crate) &'a mut T);
+
+impl<'a, T: Body + Unpin + ?Sized> Future for Data<'a, T> {
+    type Output = Option<Result<T::Data, T::Error>>;
+
+    fn poll(mut self: Pin<&mut Self>, ctx: &mut task::Context<'_>) -> task::Poll<Self::Output> {
+        Pin::new(&mut self.0).poll_data(ctx)
+    }
+}
+
+#[must_use = "futures don't do anything unless polled"]
+#[derive(Debug)]
+/// Future that resolves to the optional trailers from `Body`
+pub struct Trailers<'a, T: ?Sized>(pub(crate) &'a mut T);
+
+impl<'a, T: Body + Unpin + ?Sized> Future for Trailers<'a, T> {
+    type Output = Result<Option<http::HeaderMap>, T::Error>;
+
+    fn poll(mut self: Pin<&mut Self>, ctx: &mut task::Context<'_>) -> task::Poll<Self::Output> {
+        Pin::new(&mut self.0).poll_trailers(ctx)
+    }
+}
diff --git a/third_party/rust/http-body/src/size_hint.rs b/third_party/rust/http-body/src/size_hint.rs
new file mode 100644
index 0000000000..00a8f19177
--- /dev/null
+++ b/third_party/rust/http-body/src/size_hint.rs
@@ -0,0 +1,86 @@
+use std::u64;
+
+/// A `Body` size hint
+///
+/// The default implementation returns:
+///
+/// * 0 for `lower`
+/// * `None` for `upper`.
+#[derive(Debug, Default, Clone)]
+pub struct SizeHint {
+    lower: u64,
+    upper: Option<u64>,
+}
+
+impl SizeHint {
+    /// Returns a new `SizeHint` with default values
+    #[inline]
+    pub fn new() -> SizeHint {
+        SizeHint::default()
+    }
+
+    /// Returns a new `SizeHint` with both upper and lower bounds set to the
+    /// given value.
+    #[inline]
+    pub fn with_exact(value: u64) -> SizeHint {
+        SizeHint {
+            lower: value,
+            upper: Some(value),
+        }
+    }
+
+    /// Returns the lower bound of data that the `Body` will yield before
+    /// completing.
+    #[inline]
+    pub fn lower(&self) -> u64 {
+        self.lower
+    }
+
+    /// Set the value of the `lower` hint.
+    ///
+    /// # Panics
+    ///
+    /// The function panics if `value` is greater than `upper`.
+    #[inline]
+    pub fn set_lower(&mut self, value: u64) {
+        assert!(value <= self.upper.unwrap_or(u64::MAX));
+        self.lower = value;
+    }
+
+    /// Returns the upper bound of data the `Body` will yield before
+    /// completing, or `None` if the value is unknown.
+    #[inline]
+    pub fn upper(&self) -> Option<u64> {
+        self.upper
+    }
+
+    /// Set the value of the `upper` hint value.
+    ///
+    /// # Panics
+    ///
+    /// This function panics if `value` is less than `lower`.
+    #[inline]
+    pub fn set_upper(&mut self, value: u64) {
+        assert!(value >= self.lower, "`value` is less than than `lower`");
+
+        self.upper = Some(value);
+    }
+
+    /// Returns the exact size of data that will be yielded **if** the
+    /// `lower` and `upper` bounds are equal.
+    #[inline]
+    pub fn exact(&self) -> Option<u64> {
+        if Some(self.lower) == self.upper {
+            self.upper
+        } else {
+            None
+        }
+    }
+
+    /// Set the value of the `lower` and `upper` bounds to exactly the same.
+    #[inline]
+    pub fn set_exact(&mut self, value: u64) {
+        self.lower = value;
+        self.upper = Some(value);
+    }
+}
diff --git a/third_party/rust/http-body/tests/is_end_stream.rs b/third_party/rust/http-body/tests/is_end_stream.rs
new file mode 100644
index 0000000000..beaeb0b1a0
--- /dev/null
+++ b/third_party/rust/http-body/tests/is_end_stream.rs
@@ -0,0 +1,79 @@
+use http::HeaderMap;
+use http_body::{Body, SizeHint};
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+struct Mock {
+    size_hint: SizeHint,
+}
+
+impl Body for Mock {
+    type Data = ::std::io::Cursor<Vec<u8>>;
+    type Error = ();
+
+    fn poll_data(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Option<Result<Self::Data, Self::Error>>> {
+        Poll::Ready(None)
+    }
+
+    fn poll_trailers(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+    ) -> Poll<Result<Option<HeaderMap>, Self::Error>> {
+        Poll::Ready(Ok(None))
+    }
+
+    fn size_hint(&self) -> SizeHint {
+        self.size_hint.clone()
+    }
+}
+
+#[test]
+fn is_end_stream_true() {
+    let combos = [
+        (None, None, false),
+        (Some(123), None, false),
+        (Some(0), Some(123), false),
+        (Some(123), Some(123), false),
+        (Some(0), Some(0), false),
+    ];
+
+    for &(lower, upper, is_end_stream) in &combos {
+        let mut size_hint = SizeHint::new();
+        assert_eq!(0, size_hint.lower());
+        assert!(size_hint.upper().is_none());
+
+        if let Some(lower) = lower {
+            size_hint.set_lower(lower);
+        }
+
+        if let Some(upper) = upper {
+            size_hint.set_upper(upper);
+        }
+
+        let mut mock = Mock { size_hint };
+
+        assert_eq!(
+            is_end_stream,
+            Pin::new(&mut mock).is_end_stream(),
+            "size_hint = {:?}",
+            mock.size_hint.clone()
+        );
+    }
+}
+
+#[test]
+fn is_end_stream_default_false() {
+    let mut mock = Mock {
+        size_hint: SizeHint::default(),
+    };
+
+    assert_eq!(
+        false,
+        Pin::new(&mut mock).is_end_stream(),
+        "size_hint = {:?}",
+        mock.size_hint.clone()
+    );
+}