rustc issue: https://github.com/rust-lang/rust/issues/55105
Steps to reproduce:
```
rustup target add armv7-linux-androideabi
RUSTFLAGS="-Ctarget-feature=+neon" cargo build --target armv7-linux-androideabi --release
```
Output without this change:
```
Compiling hyper v0.12.11 (/home/simon/projects/servo-deps/hyper)
LLVM ERROR: ran out of registers during register allocation
error: Could not compile `hyper`.
```
- Adds `Body::on_upgrade()` that returns an `OnUpgrade` future.
- Adds `hyper::upgrade` module containing types for dealing with
upgrades.
- Adds `server::conn::Connection::with_upgrades()` method to enable
these upgrades when using lower-level API (because of a missing
`Send` bound on the transport generic).
- Client connections are automatically enabled.
- Optimizes request parsing, to make up for extra work to look for
upgrade requests.
- Returns a smaller `DecodedLength` type instead of the fatter
`Decoder`, which should also allow a couple fewer branches.
- Removes the `Decode::Ignore` wrapper enum, and instead ignoring
1xx responses is handled directly in the response parsing code.
Ref #1563Closes#1395
- In the higher-level `Server` API, since connection upgrades aren't yet
supported, returning a 2xx response to a `CONNECT` request is a user
error. A 500 response is written to the client, the connection is
closed, and an error is reported back to the user.
- In the lower-level `server::Connection` API, where upgrades *are*
supported, a 2xx response correctly marks the response as the final
one, instead of trying to parse more requests afterwards.
- When the `Body` is created from a buffer of bytes (such as
`Body::from("hello")`), we can skip some bookkeeping that is
normally required for streaming bodies.
- Orthogonally, optimize encoding body chunks when the strategy
is to flatten into the headers buf, by skipping the EncodedBuf
enum.
If an HTTP/1 connection has a parse error, but it starts with the HTTP2 preface, converts the connection automatically into an HTTP2 server connection.
Closes#1486
**The `Error` is now an opaque struct**, which allows for more variants to
be added freely, and the internal representation to change without being
breaking changes.
For inspecting an `Error`, there are several `is_*` methods to check for
certain classes of errors, such as `Error::is_parse()`. The `cause` can
also be inspected, like before. This likely seems like a downgrade, but
more inspection can be added as needed!
The `Error` now knows about more states, which gives much more context
around when a certain error occurs. This is also expressed in the
description and `fmt` messages.
**Most places where a user would provide an error to hyper can now pass
any error type** (`E: Into<Box<std::error::Error>>`). This error is passed
back in relevant places, and can be useful for logging. This should make
it much clearer about what error a user should provide to hyper: any it
feels is relevant!
Closes#1128Closes#1130Closes#1431Closes#1338
BREAKING CHANGE: `Error` is no longer an enum to pattern match over, or
to construct. Code will need to be updated accordingly.
For body streams or `Service`s, inference might be unable to determine
what error type you mean to return. Starting in Rust 1.26, you could
just label that as `!` if you never return an error.
This dedicated `Entity` trait replaces the previous `Stream<Item=impl
AsRef<[u8]>, Error=hyper::Error>`. This allows for several improvements
immediately, and prepares for HTTP2 support.
- The `Entity::is_end_stream` makes up for change away from
`Option<Body>`, which was previously used to know if the body should be
empty. Since `Request` and `Response` now require a body to be set,
this method can be used to tell hyper that the body is actually empty.
It also provides the possibility of slight optimizations when polling
for data, by allowing to check `is_end_stream` before polling again.
This can allow a consumer to know that a body stream has ended without
polling for `None` afterwards.
- The `Entity::content_length` method allows a body to automatically
declare a size, in case a user doesn't set a `Content-Length` or
`Transfer-Encoding` header.
- It's now possible to send and receive trailers, though this will be
for HTTP2 connections only.
By being a trait owned by hyper, new methods can be added later as new
features are wanted (with default implementations).
The `hyper::Body` type now implements `Entity` instead of `Stream`,
provides a better channel option, and is easier to use with custom
streams via `Body::wrap_stream`.
BREAKING CHANGE: All code that was assuming the body was a `Stream` must
be adjusted to use an `Entity` instead.
Using `hyper::Body` as a `Stream` can call `Body::into_stream`
to get a stream wrapper.
Passing a custom `impl Stream` will need to either implement
`Entity`, or as an easier option, switch to `Body::wrap_stream`.
`Body::pair` has been replaced with `Body::channel`, which returns a
`hyper::body::Sender` instead of a `futures::sync::mpsc::Sender`.
Closes#1438
BREAKING CHANGE: `Method`, `Request`, `Response`, `StatusCode`,
`Version`, and `Uri` have been replaced with types from the `http`
crate. The `hyper::header` module is gone for now.
Removed `Client::get`, since it needed to construct a `Request<B>`
with an empty body. Just use `Client::request` instead.
Removed `compat` cargo feature, and `compat` related API.
