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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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mod_http2: rework of stream states and cleanup handling.



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(If we remove the virtual_script stuff, remove Jim from this CHANGES entry)


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Also fix up a couple typos.

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Neither of the following makes sense:
- ProxyFCGISetEnvIf cond !VARIABLE value
- ProxyFCGISetEnvIf cond !

Error out in these cases. Also, don't execute the (unused) replacement
expression when unsetting.

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Add syntax highlight + change separator in regex (# --> |) in order to please syntax highlighting engine

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