wait-for-handshake http-request action was completely ineffective with QUIC protocol. This commit implements its support for QUIC. QUIC MUX layer is extended to support wait-for-handshake. A new function qcc_handle_wait_for_hs() is executed during qcc_io_process(). It detects if MUX processing occurs after underlying QUIC handshake completion. If this is the case, it indicates that early data may be received. As such, connection is flagged with CO_FL_EARLY_SSL_HS, which is necessary to block stream processing on wait-for-handshake action. After this, qcc subscribs on quic_conn layer for RECV notification. This is used to detect QUIC handshake completion. Thus, qcc_handle_wait_for_hs() can be reexecuted one last time, to remove CO_FL_EARLY_SSL_HS and notify every streams flagged as SE_FL_WAIT_FOR_HS. This patch must be backported up to 2.6, after a mandatory period of observation. Note that it relies on the backport of the two previous patches : - MINOR: quic: notify connection layer on handshake completion - BUG/MINOR: stream: unblock stream on wait-for-handshake completion (cherry picked from commit 0918c41ef63964a986c627d20b8a1324de639cc2) Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>