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mod_http2: rewrite of how responses and trailers are transferred between
     master and slave connection. Reduction of internal states for tasks
     and streams, stability. Heuristic id generation for slave connections
     to better keep promise of connection ids unique at given point int time.
     Fix for mod_cgid interop in high load situtations. 
     Fix for handling of incoming trailers when no request body is sent.



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Will follow up on-list.

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configure: move away from obsolete AC_OUTPUT args

AC_OUTPUT's use with arguments was obsoleted back at or before autoconf
2.50. Replace it with the preferred AC_CONFIG_FILES/AC_CONFIG_COMMANDS
calls.

configure: remove orphaned APACHE_OUTPUT macro

The last use of APACHE_OUTPUT appears to have been removed back in
r87231.
Submitted by: jchampion
Reviewed/backported by: jim


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Remove some trailing spaces to synch with trunk

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mod_http2: fix for output blocking race condition



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missing paren -- thanks to danielsh



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xforms


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emphasize that the config sections are not even used



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backport & expand on Define in non-global scope.

We can't backport fixing Define, so explain the problem.



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expand third common in the expression functions doc

Explain some risks at looking at per-request environment variables
set by other modules within <If>.

http://stackoverflow.com/questions/39462011/htaccess-if-else-always-selects-else





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feedback in   http://httpd.apache.org/docs/2.4/mod/mod_ssl.html#comment_5818

This added paragraph about optional and optional_no_ca isn't helpful.

At the TLS layer, the challenge for otpional and required are no different.

Move the caution about _no_ca up into where the option is defined
and reword.





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mod_proxy_html doc - Added a reference of ProxyHTMLLinks in the ProxyHTMLURLMap description and some examples.

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