Split response future from client::Stream (#153)

This commit is contained in:
Carl Lerche
2017-10-16 20:17:07 -07:00
committed by GitHub
parent 7c287af0d0
commit faf59f7e24
9 changed files with 121 additions and 125 deletions

View File

@@ -75,9 +75,9 @@ pub fn main() {
.body(())
.unwrap();
let stream = client.send_request(request, true).unwrap();
let (response, _) = client.send_request(request, true).unwrap();
let stream = stream.and_then(|response| {
let stream = response.and_then(|response| {
let (_, body) = response.into_parts();
body.for_each(|chunk| {

View File

@@ -70,7 +70,7 @@ pub fn main() {
let mut trailers = HeaderMap::new();
trailers.insert("zomg", "hello".parse().unwrap());
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// send trailers
stream.send_trailers(trailers).unwrap();
@@ -78,7 +78,7 @@ pub fn main() {
// Spawn a task to run the conn...
handle.spawn(h2.map_err(|e| println!("GOT ERR={:?}", e)));
stream
response
.and_then(|response| {
println!("GOT RESPONSE: {:?}", response);

View File

@@ -29,6 +29,11 @@ pub struct Connection<T, B: IntoBuf> {
inner: proto::Connection<T, Peer, B>,
}
#[derive(Debug)]
pub struct ResponseFuture<B: IntoBuf> {
inner: proto::StreamRef<B::Buf, Peer>,
}
#[derive(Debug)]
pub struct Stream<B: IntoBuf> {
inner: proto::StreamRef<B::Buf, Peer>,
@@ -113,7 +118,7 @@ where
&mut self,
request: Request<()>,
end_of_stream: bool,
) -> Result<Stream<B>, ::Error> {
) -> Result<(ResponseFuture<B>, Stream<B>), ::Error> {
self.inner
.send_request(request, end_of_stream, self.pending.as_ref())
.map_err(Into::into)
@@ -121,9 +126,16 @@ where
if stream.is_pending_open() {
self.pending = Some(stream.key());
}
Stream {
let response = ResponseFuture {
inner: stream.clone(),
};
let stream = Stream {
inner: stream,
}
};
(response, stream)
})
}
}
@@ -334,19 +346,26 @@ where
}
}
// ===== impl Stream =====
// ===== impl ResponseFuture =====
impl<B: IntoBuf> Stream<B> {
/// Receive the HTTP/2.0 response, if it is ready.
pub fn poll_response(&mut self) -> Poll<Response<Body<B>>, ::Error> {
impl<B: IntoBuf> Future for ResponseFuture<B> {
type Item = Response<Body<B>>;
type Error = ::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let (parts, _) = try_ready!(self.inner.poll_response()).into_parts();
let body = Body {
inner: ReleaseCapacity { inner: self.inner.clone() },
};
Ok(Response::from_parts(parts, body).into())
}
}
// ===== impl Stream =====
impl<B: IntoBuf> Stream<B> {
/// Request capacity to send data
pub fn reserve_capacity(&mut self, capacity: usize) {
// TODO: Check for overflow
@@ -381,15 +400,6 @@ impl<B: IntoBuf> Stream<B> {
}
}
impl<B: IntoBuf> Future for Stream<B> {
type Item = Response<Body<B>>;
type Error = ::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
self.poll_response()
}
}
// ===== impl Body =====
impl<B: IntoBuf> Body<B> {

View File

@@ -47,7 +47,7 @@ fn client_other_thread() {
.unwrap();
let res = client
.send_request(request, true)
.unwrap()
.unwrap().0
.wait()
.expect("request");
assert_eq!(res.status(), StatusCode::OK);
@@ -85,13 +85,13 @@ fn recv_invalid_server_stream_id() {
.unwrap();
info!("sending request");
let stream = client.send_request(request, true).unwrap();
let (response, _) = client.send_request(request, true).unwrap();
// The connection errors
assert!(h2.wait().is_err());
// The stream errors
assert!(stream.wait().is_err());
assert!(response.wait().is_err());
}
#[test]
@@ -112,9 +112,9 @@ fn request_stream_id_overflows() {
.unwrap();
// first request is allowed
let req = client.send_request(request, true).unwrap().unwrap();
let (response, _) = client.send_request(request, true).unwrap();
h2.drive(req).and_then(move |(h2, _)| {
h2.drive(response).and_then(move |(h2, _)| {
let request = Request::builder()
.method(Method::GET)
.uri("https://example.com/")
@@ -180,8 +180,9 @@ fn client_builder_max_concurrent_streams() {
.uri("https://example.com/")
.body(())
.unwrap();
let req = client.send_request(request, true).unwrap().unwrap();
h2.drive(req).map(move |(h2, _)| (client, h2))
let (response, _) = client.send_request(request, true).unwrap();
h2.drive(response).map(move |(h2, _)| (client, h2))
});
h2.join(srv).wait().expect("wait");
@@ -226,8 +227,8 @@ fn request_over_max_concurrent_streams_errors() {
.unwrap();
// first request is allowed
let req = client.send_request(request, true).unwrap().unwrap();
h2.drive(req).map(move |(h2, _)| (client, h2))
let (response, _) = client.send_request(request, true).unwrap();
h2.drive(response).map(move |(h2, _)| (client, h2))
})
.and_then(|(mut client, h2)| {
let request = Request::builder()
@@ -237,7 +238,7 @@ fn request_over_max_concurrent_streams_errors() {
.unwrap();
// first request is allowed
let mut req = client.send_request(request, false).unwrap();
let (resp1, mut stream1) = client.send_request(request, false).unwrap();
let request = Request::builder()
.method(Method::POST)
@@ -246,7 +247,7 @@ fn request_over_max_concurrent_streams_errors() {
.unwrap();
// second request is put into pending_open
let mut req2 = client.send_request(request, false).unwrap();
let (resp2, mut stream2) = client.send_request(request, false).unwrap();
let request = Request::builder()
.method(Method::GET)
@@ -260,11 +261,12 @@ fn request_over_max_concurrent_streams_errors() {
let err = client.send_request(request, true).unwrap_err();
assert_eq!(err.to_string(), "user error: rejected");
req.send_data("hello".into(), true).expect("req send_data");
h2.drive(req.expect("req")).and_then(move |(h2, _)| {
req2.send_data("hello".into(), true)
stream1.send_data("hello".into(), true).expect("req send_data");
h2.drive(resp1.expect("req")).and_then(move |(h2, _)| {
stream2.send_data("hello".into(), true)
.expect("req2 send_data");
h2.expect("h2").join(req2.expect("req2"))
h2.expect("h2").join(resp2.expect("req2"))
})
});
@@ -305,12 +307,15 @@ fn sending_request_on_closed_connection() {
.uri("https://http2.akamai.com/")
.body(())
.unwrap();
// first request works
let req = client
.send_request(request, true)
.expect("send_request1")
.0
.expect("response1")
.map(|_| ());
// after finish request1, there should be a conn error
let h2 = h2.then(|res| {
res.expect_err("h2 error");

View File

@@ -35,7 +35,7 @@ fn send_data_without_requesting_capacity() {
.body(())
.unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// The capacity should be immediately allocated
assert_eq!(stream.capacity(), 0);
@@ -44,7 +44,7 @@ fn send_data_without_requesting_capacity() {
stream.send_data(payload[..].into(), true).unwrap();
// Get the response
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
h2.wait().unwrap();
@@ -90,6 +90,7 @@ fn release_capacity_sends_window_update() {
.unwrap();
let req = client.send_request(request, true).unwrap()
.0
.unwrap()
// Get the response
.and_then(|resp| {
@@ -117,6 +118,7 @@ fn release_capacity_sends_window_update() {
assert_eq!(buf.unwrap().len(), payload.len());
Ok(())
});
h2.unwrap().join(req)
});
h2.join(mock).wait().unwrap();
@@ -153,6 +155,7 @@ fn release_capacity_of_small_amount_does_not_send_window_update() {
.unwrap();
let req = client.send_request(request, true).unwrap()
.0
.unwrap()
// Get the response
.and_then(|resp| {
@@ -222,7 +225,7 @@ fn recv_data_overflows_connection_window() {
let req = client
.send_request(request, true)
.unwrap()
.unwrap()
.0.unwrap()
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
let body = resp.into_parts().1;
@@ -292,7 +295,7 @@ fn recv_data_overflows_stream_window() {
let req = client
.send_request(request, true)
.unwrap()
.unwrap()
.0.unwrap()
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
let body = resp.into_parts().1;
@@ -343,7 +346,7 @@ fn stream_close_by_data_frame_releases_capacity() {
.unwrap();
// Send request
let mut s1 = client.send_request(request, false).unwrap();
let (resp1, mut s1) = client.send_request(request, false).unwrap();
// This effectively reserves the entire connection window
s1.reserve_capacity(window_size);
@@ -359,7 +362,7 @@ fn stream_close_by_data_frame_releases_capacity() {
.unwrap();
// Create a second stream
let mut s2 = client.send_request(request, false).unwrap();
let (resp2, mut s2) = client.send_request(request, false).unwrap();
// Request capacity
s2.reserve_capacity(5);
@@ -380,8 +383,8 @@ fn stream_close_by_data_frame_releases_capacity() {
// Drive both streams to prevent the handles from being dropped
// (which will send a RST_STREAM) before the connection is closed.
h2.drive(s1)
.and_then(move |(h2, _)| h2.drive(s2))
h2.drive(resp1)
.and_then(move |(h2, _)| h2.drive(resp2))
})
.unwrap();
@@ -414,7 +417,7 @@ fn stream_close_by_trailers_frame_releases_capacity() {
.unwrap();
// Send request
let mut s1 = client.send_request(request, false).unwrap();
let (resp1, mut s1) = client.send_request(request, false).unwrap();
// This effectively reserves the entire connection window
s1.reserve_capacity(window_size);
@@ -430,7 +433,7 @@ fn stream_close_by_trailers_frame_releases_capacity() {
.unwrap();
// Create a second stream
let mut s2 = client.send_request(request, false).unwrap();
let (resp2, mut s2) = client.send_request(request, false).unwrap();
// Request capacity
s2.reserve_capacity(5);
@@ -451,8 +454,8 @@ fn stream_close_by_trailers_frame_releases_capacity() {
// Drive both streams to prevent the handles from being dropped
// (which will send a RST_STREAM) before the connection is closed.
h2.drive(s1)
.and_then(move |(h2, _)| h2.drive(s2))
h2.drive(resp1)
.and_then(move |(h2, _)| h2.drive(resp2))
})
.unwrap();
@@ -484,27 +487,6 @@ fn stream_close_by_send_reset_frame_releases_capacity() {}
#[ignore]
fn stream_close_by_recv_reset_frame_releases_capacity() {}
use futures::{Async, Poll};
struct GetResponse {
stream: Option<client::Stream<Bytes>>,
}
impl Future for GetResponse {
type Item = (Response<client::Body<Bytes>>, client::Stream<Bytes>);
type Error = ();
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let response = match self.stream.as_mut().unwrap().poll_response() {
Ok(Async::Ready(v)) => v,
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(e) => panic!("unexpected error; {:?}", e),
};
Ok(Async::Ready((response, self.stream.take().unwrap())))
}
}
#[test]
fn recv_window_update_on_stream_closed_by_data_frame() {
let _ = ::env_logger::init();
@@ -519,12 +501,10 @@ fn recv_window_update_on_stream_closed_by_data_frame() {
.body(())
.unwrap();
let stream = client.send_request(request, false).unwrap();
let (response, stream) = client.send_request(request, false).unwrap();
// Wait for the response
h2.drive(GetResponse {
stream: Some(stream),
})
h2.drive(response.map(|response| (response, stream)))
})
.and_then(|(h2, (response, mut stream))| {
assert_eq!(response.status(), StatusCode::OK);
@@ -570,7 +550,7 @@ fn reserved_capacity_assigned_in_multi_window_updates() {
.body(())
.unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// Consume the capacity
let payload = vec![0; frame::DEFAULT_INITIAL_WINDOW_SIZE as usize];
@@ -579,17 +559,17 @@ fn reserved_capacity_assigned_in_multi_window_updates() {
// Reserve more data than we want
stream.reserve_capacity(10);
h2.drive(util::wait_for_capacity(stream, 5))
h2.drive(
util::wait_for_capacity(stream, 5)
.map(|stream| (response, stream)))
})
.and_then(|(h2, mut stream)| {
.and_then(|(h2, (response, mut stream))| {
stream.send_data("hello".into(), false).unwrap();
stream.send_data("world".into(), true).unwrap();
h2.drive(GetResponse {
stream: Some(stream),
h2.drive(response)
})
})
.and_then(|(h2, (response, _))| {
.and_then(|(h2, response)| {
assert_eq!(response.status(), StatusCode::NO_CONTENT);
// Wait for the connection to close
@@ -709,8 +689,8 @@ fn connection_notified_on_released_capacity() {
});
// Get the two requests
let a = rx.recv().unwrap();
let b = rx.recv().unwrap();
let (a, _) = rx.recv().unwrap();
let (b, _) = rx.recv().unwrap();
// Get the first response
let response = a.wait().unwrap();
@@ -777,20 +757,20 @@ fn recv_settings_removes_available_capacity() {
.uri("https://http2.akamai.com/")
.body(()).unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
stream.reserve_capacity(11);
h2.drive(util::wait_for_capacity(stream, 11))
h2.drive(util::wait_for_capacity(stream, 11).map(|s| (response, s)))
})
.and_then(|(h2, mut stream)| {
.and_then(|(h2, (response, mut stream))| {
assert_eq!(stream.capacity(), 11);
stream.send_data("hello world".into(), true).unwrap();
h2.drive(GetResponse { stream: Some(stream) })
h2.drive(response)
})
.and_then(|(h2, (response, _))| {
.and_then(|(h2, response)| {
assert_eq!(response.status(), StatusCode::NO_CONTENT);
// Wait for the connection to close
@@ -838,20 +818,20 @@ fn recv_no_init_window_then_receive_some_init_window() {
.uri("https://http2.akamai.com/")
.body(()).unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
stream.reserve_capacity(11);
h2.drive(util::wait_for_capacity(stream, 11))
h2.drive(util::wait_for_capacity(stream, 11).map(|s| (response, s)))
})
.and_then(|(h2, mut stream)| {
.and_then(|(h2, (response, mut stream))| {
assert_eq!(stream.capacity(), 11);
stream.send_data("hello world".into(), true).unwrap();
h2.drive(GetResponse { stream: Some(stream) })
h2.drive(response)
})
.and_then(|(h2, (response, _))| {
.and_then(|(h2, response)| {
assert_eq!(response.status(), StatusCode::NO_CONTENT);
// Wait for the connection to close
@@ -930,12 +910,12 @@ fn settings_lowered_capacity_returns_capacity_to_connection() {
let request = Request::post("https://example.com/one")
.body(()).unwrap();
let mut stream1 = client.send_request(request, false).unwrap();
let (resp1, mut stream1) = client.send_request(request, false).unwrap();
let request = Request::post("https://example.com/two")
.body(()).unwrap();
let mut stream2 = client.send_request(request, false).unwrap();
let (resp2, mut stream2) = client.send_request(request, false).unwrap();
// Reserve capacity for stream one, this will consume all connection level
// capacity
@@ -955,10 +935,10 @@ fn settings_lowered_capacity_returns_capacity_to_connection() {
stream1.send_data("hello world".into(), true).unwrap();
// Wait for responses..
let resp = stream1.wait().unwrap();
let resp = resp1.wait().unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
let resp = stream2.wait().unwrap();
let resp = resp2.wait().unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
th1.join().unwrap();
@@ -1011,7 +991,7 @@ fn increase_target_window_size_after_using_some() {
.uri("https://http2.akamai.com/")
.body(()).unwrap();
let res = client.send_request(request, true).unwrap()
let res = client.send_request(request, true).unwrap().0
.and_then(|res| {
// "leak" the capacity for now
res.into_parts().1.concat2()
@@ -1055,8 +1035,8 @@ fn decrease_target_window_size() {
let request = Request::builder()
.uri("https://http2.akamai.com/")
.body(()).unwrap();
let res = client.send_request(request, true).unwrap();
conn.drive(res.expect("response"))
let (resp, _) = client.send_request(request, true).unwrap();
conn.drive(resp.expect("response"))
})
.and_then(|(mut conn, res)| {
conn.set_target_window_size(16_384);

View File

@@ -33,7 +33,7 @@ fn single_stream_send_large_body() {
.body(())
.unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// Reserve capacity to send the payload
stream.reserve_capacity(payload.len());
@@ -45,7 +45,7 @@ fn single_stream_send_large_body() {
stream.send_data(payload[..].into(), true).unwrap();
// Get the response
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
h2.wait().unwrap();
@@ -87,7 +87,7 @@ fn single_stream_send_extra_large_body_multi_frames_one_buffer() {
.body(())
.unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
stream.reserve_capacity(payload.len());
@@ -98,7 +98,7 @@ fn single_stream_send_extra_large_body_multi_frames_one_buffer() {
stream.send_data(payload.into(), true).unwrap();
// Get the response
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
h2.wait().unwrap();
@@ -152,7 +152,7 @@ fn single_stream_send_extra_large_body_multi_frames_multi_buffer() {
.body(())
.unwrap();
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
stream.reserve_capacity(payload.len());
@@ -163,7 +163,7 @@ fn single_stream_send_extra_large_body_multi_frames_multi_buffer() {
stream.send_data(payload.into(), true).unwrap();
// Get the response
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
@@ -185,7 +185,7 @@ fn send_data_receive_window_update() {
.unwrap();
// Send request
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// Send data frame
stream.send_data("hello".into(), false).unwrap();
@@ -196,9 +196,9 @@ fn send_data_receive_window_update() {
h2.drive(util::wait_for_capacity(
stream,
frame::DEFAULT_INITIAL_WINDOW_SIZE as usize,
))
).map(|s| (response, s)))
})
.and_then(|(h2, mut stream)| {
.and_then(|(h2, (_r, mut stream))| {
let payload = vec![0; frame::DEFAULT_INITIAL_WINDOW_SIZE as usize];
stream.send_data(payload.into(), true).unwrap();

View File

@@ -29,7 +29,7 @@ fn recv_push_works() {
let req = client
.send_request(request, true)
.unwrap()
.unwrap()
.0.unwrap()
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
Ok(())
@@ -68,7 +68,8 @@ fn recv_push_when_push_disabled_is_conn_error() {
.uri("https://http2.akamai.com/")
.body(())
.unwrap();
let req = client.send_request(request, true).unwrap().then(|res| {
let req = client.send_request(request, true).unwrap().0.then(|res| {
let err = res.unwrap_err();
assert_eq!(
err.to_string(),

View File

@@ -29,9 +29,9 @@ fn send_recv_headers_only() {
.unwrap();
info!("sending request");
let mut stream = client.send_request(request, true).unwrap();
let (response, _) = client.send_request(request, true).unwrap();
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::NO_CONTENT);
h2.wait().unwrap();
@@ -71,7 +71,7 @@ fn send_recv_data() {
.unwrap();
info!("sending request");
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
// Reserve send capacity
stream.reserve_capacity(5);
@@ -82,7 +82,7 @@ fn send_recv_data() {
stream.send_data("hello", true).unwrap();
// Get the response
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::OK);
// Take the body
@@ -128,9 +128,9 @@ fn send_headers_recv_data_single_frame() {
.unwrap();
info!("sending request");
let mut stream = client.send_request(request, true).unwrap();
let (response, _) = client.send_request(request, true).unwrap();
let resp = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let resp = h2.run(response).unwrap();
assert_eq!(resp.status(), StatusCode::OK);
// Take the body
@@ -158,8 +158,8 @@ fn closed_streams_are_released() {
let request = Request::get("https://example.com/").body(()).unwrap();
// Send request
let stream = client.send_request(request, true).unwrap();
h2.drive(stream).and_then(move |(_, response)| {
let (response, _) = client.send_request(request, true).unwrap();
h2.drive(response).and_then(move |(_, response)| {
assert_eq!(response.status(), StatusCode::NO_CONTENT);
// There are no active streams
@@ -207,7 +207,7 @@ fn errors_if_recv_frame_exceeds_max_frame_size() {
let req = client
.send_request(request, true)
.unwrap()
.unwrap()
.0.unwrap()
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
let body = resp.into_parts().1;
@@ -266,7 +266,7 @@ fn configure_max_frame_size() {
let req = client
.send_request(request, true)
.unwrap()
.expect("response")
.0.expect("response")
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
let body = resp.into_parts().1;
@@ -334,7 +334,7 @@ fn recv_goaway_finishes_processed_streams() {
let req1 = client.send_request(request, true)
.unwrap()
.expect("response")
.0.expect("response")
.and_then(|resp| {
assert_eq!(resp.status(), StatusCode::OK);
let body = resp.into_parts().1;
@@ -354,7 +354,7 @@ fn recv_goaway_finishes_processed_streams() {
.unwrap();
let req2 = client.send_request(request, true)
.unwrap()
.then(|res| {
.0.then(|res| {
let err = res.unwrap_err();
assert_eq!(err.to_string(), "protocol error: not a result of an error");
Ok::<(), ()>(())

View File

@@ -32,9 +32,9 @@ fn recv_trailers_only() {
.unwrap();
info!("sending request");
let mut stream = client.send_request(request, true).unwrap();
let (response, _) = client.send_request(request, true).unwrap();
let response = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let response = h2.run(response).unwrap();
assert_eq!(response.status(), StatusCode::OK);
let (_, mut body) = response.into_parts();
@@ -80,14 +80,14 @@ fn send_trailers_immediately() {
.unwrap();
info!("sending request");
let mut stream = client.send_request(request, false).unwrap();
let (response, mut stream) = client.send_request(request, false).unwrap();
let mut trailers = HeaderMap::new();
trailers.insert("zomg", "hello".parse().unwrap());
stream.send_trailers(trailers).unwrap();
let response = h2.run(poll_fn(|| stream.poll_response())).unwrap();
let response = h2.run(response).unwrap();
assert_eq!(response.status(), StatusCode::OK);
let (_, mut body) = response.into_parts();