mod_proxy_http: handle async tunneling of Upgrade(d) protocol. #126
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Since event_register_poll_callback_ex() allocates its data on pfds->pool, we need a subpool to be cleared at each proxy_wstunnel_callback() call.
When supported by the MPM (i.e. "event"), provide async callbacks and let them be scheduled by ap_mpm_register_poll_callback_timeout(), while the handler returns SUSPENDED.
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When supported by the MPM (i.e. "event"), provide async callbacks and let
them be scheduled by ap_mpm_register_poll_callback_timeout(), while the
handler returns SUSPENDED.