Co-authored-by: silence <[email protected]>
(cherry picked from commit 5fa113e)

(cherry picked from commit a563404)

…eepalive_retries` (#2991)

If the platform supports setting the options, otherwise it's a noop.

…ixes #2649)

Closes #3038

There exists a race condition in ClientTask::poll() when the request
that is sent via h2::client::send_request() is pending open. A task will
be spawned to wait for send capacity on the sendstream. Because this
same stream is also stored in the pending member of
h2::client::SendRequest the next iteration of the poll() loop can call
poll_ready() and call wait_send() on the same stream passed into the
spawned task.

Fix this by always calling poll_ready() after send_request(). If this
call to poll_ready() returns Pending save the necessary context in
ClientTask and only spawn the task that will eventually resolve to the
response after poll_ready() returns Ok.

Closes #2419

Closes #3045

Allows adding headers with arbitrary casing
so that we can have headers that are all-caps,
all upper-case, or whatever else we want.

Co-authored-by: James Lucas <[email protected]>

This allows case-sensitive headers to be added
by simply adding a HeaderCaseMap-typed extension
to the hyper Request object.

Co-authored-by: James Lucas <[email protected]>