mod_http2: adding allocator mutex back to mplx after crash in stress test



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mod_http2: removing extra mutex for h2 apr_allocators again.



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(reverts r1783761 and r1783755 partially, style changes preserved)



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(reverts r1783808)



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(reverts r1783755 partially)



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a possible crash if a signal is caught during (graceful) restart.
PR 60487.



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computing and using the same entity key according to when the cache
checks, loads and saves the request.  PR 60577.
 


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Use an allocator and mutex for ptrans' to be safe with concurrent
creation and destruction of its subpools, like with mod_http2.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1783810 13f79535-47bb-0310-9956-ffa450edef68

Use a mutex for ptrans' allocator to be safe with concurrent
creation and destruction of its subpools, like with mod_http2.



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with concurrent creation and destruction of their subpools.



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creation and destruction of its subpools, like with mod_http2.



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mod_proxy_http2: support for ProxyPreserverHost directive.



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mod_http2: update after backport



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OpenSSL team is committed to preserving safe _free(NULL) behaviors, and the
overhead of these calls in the context setup path is inconsequential. 



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This was our first compatibility pattern but we are not preserving it, it seems
irrelevant since the death of 16 bit Windows object files.



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warnings) in OpenSSL 1.1.0 and avoid _free()ing NULL references.



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  *) mod_http2: not counting file buckets again stream max buffer limits. 
     Effectively transfering static files in one step from slave to master 
     connection. [Stefan Eissing]



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mod_http2: aplogno tags, more unified log formatting



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mod_http2: facilitate slave connection reuse by comforting ap_check_pipeline.



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