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upate after mod_http2 backport



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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.



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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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