Cowboy takes a few shortcuts to avoid wasting resources when
there is a protocol error. The RFC wants us to send a different
error depending on the state of the stream at the time of the
error, and for us to maintain the connection in cases where we
would have to spend valuable resources to decode headers. In
all these cases Cowboy will simply close the connection with
an appropriate error.
When the user code was sending a response fully without reading
the request body, the connection could get closed when receiving
DATA frames for that body. We now ask the client to stop sending
data via a NO_ERROR RST_STREAM, and linger any stream that has
been reset so that we can skip any pending frames from that
stream.
This fixes a number of intermittent failures in req_SUITE, which
now passes reliably.
In addition a small number of rfc7540_SUITE test cases have been
corrected as they were incorrect.
These tests cover frame sizes. It's mostly edge cases for sure
(ie misbehaving clients and us having to reject them properly).
I had these almost ready for a long time, so I'm glad I can
push them out.
This requires updating Cowlib too (we currently track master).
The same edge cases that fail with other handshake methods
also fail here (mostly bad preface/timeouts stuff). In
addition, the HTTP2-Settings header contents are currently
not checked and so the related edge case tests also fail.
Currently only testing handshake.
Tests that pass currently involve no request/response.
ALPN and prior knowledge support have some edge cases left to fix.
HTTP/1.1 Upgrade has not been implemented yet.
