This is required to use HTTP/1 websockets on an HTTP/2 server, which is
fairly common as websockets over HTTP/2 is much less widely supported.
This was broken by the recent shouldUpgradeCallback HTTP/1 addition,
which wasn't correctly added to the corresponding allowHttp1 part of
the HTTP/2 implementation.
PR-URL: https://github.com/nodejs/node/pull/59924
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>