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Motivation:
HTTP/2 multiplexed requests randomly time out (~0.5%) under load because stream slots leak when Http2StreamChannelBootstrap.open() fails, eventually starving the connection. Secondary bugs — parent channel attribute overwrite, empty handleChannelInactive(), and a TOCTOU race in addPendingOpener() — amplify the issue by leaving failed requests undetected.
Modification:
Release stream slots on all failure paths in openHttp2Stream(), skip setAttribute() on HTTP/2 parent channels, implement handleChannelInactive()/handleException() in Http2Handler, set active token on stream channels, and synchronize addPendingOpener/drainPendingOpeners to eliminate the race condition.
Result:
Zero silent timeouts under concurrent HTTP/2 load with connection disruptions.