BUG/MINOR: h2/mux-h2: Reject 101 responses with a PROTOCOL_ERROR h2s error

As stated in the RFC7540, section 8.1.1, the HTTP/2 removes support for the
101 informational status code. Thus a PROTOCOL_ERROR is now returned to the
server if a 101-switching-protocols response is received. Thus, the server
connection is aborted.

This patch may be backported as far as 2.0.
2 files changed