MEDIUM: mux-h1: Return a 501-not-implemented for upgrade requests with a body

If an HTTP protocol upgrade request with a payload is received, a
501-not-implemented error is now returned to the client. It is valid from
the RFC point of view but will be incompatible with the way the H2
websockets will be handled by HAProxy. And it is probably a very uncommon
way to do perform protocol upgrades.
1 file changed