tree bc1c7c73faec5602ed0bf0c1fa2a2e30b168124f
parent b5edf03cd33002270fb9cc797f54789e5507a2b1
author Ed Tanous <etanous@nvidia.com> 1738442276 -0800
committer Ed Tanous <etanous@nvidia.com> 1739220973 +0000

Support h2c upgrade

h2c upgrade is a mechanism for supporting http/2 on connections that
might not support alpn [1].  This is done by the client specifying
Connection: upgrade
Upgrade: h2c

This looks very similar to a websocket upgrade, which h2c replacing
websocket.  Because of this, the existing upgrade code needs some
upgrades to avoid parsing twice.

Tested:
```
curl -u root:0penBmc --http2 -k http://192.168.7.2:443/redfish/v1/SessionService/Sessions
```

Succeeds and verbose logging shows that http upgrade succeeded

websocket_test.py in the scripts directory connects and reports events

[1] https://datatracker.ietf.org/doc/html/rfc7540#section-11.8

Change-Id: I8f76e355f99f21337d310ef2f345e6aaa253b48b
Signed-off-by: Ed Tanous <etanous@nvidia.com>