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a78a04cfae
This commit implements support for idle-ping on the backend side. First, a new server keyword "idle-ping" is defined in configuration parsing. It is used to set the corresponding new server member. The second part of this commit implements idle-ping support on H2 MUX. A new inlined function conn_idle_ping() is defined to access connection idle-ping value. Two new connection flags are defined H2_CF_IDL_PING and H2_CF_IDL_PING_SENT. The first one is set for idle connections via h2c_update_timeout(). On h2_timeout_task() handler, if first flag is set, instead of releasing the connection as before, the second flag is set and tasklet is scheduled. As both flags are now set, h2_process_mux() will proceed to PING emission. The timer has also been rearmed to the idle-ping value. If a PING ACK is received before next timeout, connection timer is refreshed. Else, the connection is released, as with timer expiration. Also of importance, special care is needed when a backend connection is going to idle. In this case, idle-ping timer must be rearmed. Thus a new invokation of h2c_update_timeout() is performed on h2_detach().