mod_http2: less and more granular mutex use for improved performance.



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mod_http2: code cleanup after eliminating nested locks, giving worker slots their own mutex.



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mod_http2/mod_proxy_http2: less read attempts on bucket beams that already
     delivered EOS/headers. Fixed bug in re-attempting proxy request after 
     connection error.



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update after backport to 2.4.x



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mod_http2: log tags updated



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mod_http2: move stuff from master connection to worker threads, increase spare slave connections, create output beams in worker when needed.



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mod_http2: fixed problem of forgotten requests when number of connections larger than number of workers. Some code refactor, threads now queued in slot order for vanity reasons, so that the segfaults are more likely at the top and not the bottom.



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mod_http2: better performance, eliminated need for nested locks and thread privates.



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mod_http2: checking for required nghttp2 features to enabled dynamic input window resizing for streams (nghttp2 >= v1.5.0). Reporting as feature DWINS on startup.



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mod_http2 after review by Christophe:
  * fix h2_fifo_peek to properly block
  * check peek return status while processing mplx queue



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are configured (ListenCoresBucketsRatio > 0), consistently with the single
bucket case (default), thus fixing the leak of the corresponding socket
descriptors on graceful restart.



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created on pconf, hence cleaned up on restart. More investigations needed...



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when ListenCoresBucketsRatio is configured (positive).



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Style was different when r1496711  has been backported in r1772331

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'apr_pstrcatv' can compute the length of the new string for us.

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mod_http2: input buffering and dynamic flow windows for increased throughput.



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mod_http2: h2 workers with improved scalability for better scheduling
     performance. There are H2MaxWorkers threads created at start and the
     number is kept constant. 



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Fix SSLOCSPNoVerify merging, and while at it capitalize Verify as suggested
by wrowe.



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