tree 25cdc0b6a27873b0f01720c57361289ff066077a
parent 60378878ccb301821cf9212114b2e9a084163bbe
author Amaury Denoyelle <adenoyelle@haproxy.com> 1634560797 +0200
committer Christopher Faulet <cfaulet@haproxy.com> 1637677901 +0100

MEDIUM: server/backend: implement websocket protocol selection

Handle properly websocket streams if the server uses an ALPN with both
h1 and h2. Add a new field h2_ws in the server structure. If set to off,
reuse is automatically disable on backend and ALPN is forced to http1.x
if possible. Nothing is done if on.

Implement a mechanism to be able to use a different http version for
websocket streams. A new server member <ws> represents the algorithm to
select the protocol. This can overrides the server <proto>
configuration. If the connection uses ALPN for proto selection, it is
updated for websocket streams to select the right protocol.

Three mode of selection are implemented :
- auto : use the same protocol between non-ws and ws streams. If ALPN is
  use, try to update it to "http/1.1"; this is only done if the server
  ALPN contains "http/1.1".
- h1 : use http/1.1
- h2 : use http/2.0; this requires the server to support RFC8441 or an
  error will be returned by haproxy.

(cherry picked from commit 9c3251d1087061f3a0c88f69b8f62ec1f9324bd7)
[ad: adjusted context: skip reuse move in connect_server; refcount field
 in server structure renamed]
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>