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Backport of r1722572 from trunk.


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add GlobalLog directive to allow a diagnostic log to be inherited
by all virtual hosts, even if they define their own logs.

Submitted By: Edward Lu <Chaosed0 gmail.com>
Committed by: covener



document GlobalLog

Submitted by: covener
Reviewed/backported by: jim


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Don't allow bad value to be updated

Reviewed/backported by: jim


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Reviewed/backported by: jim


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Merge r1715567, r1715568, r1715570, r1715571, r1715572, r1715576, r1715581, r1715582, r1715583, r1715584, r1715585 from trunk:

Remove some useless 'return' statements.

Remove some useless 'return' statements.

Remove some useless 'return' statements.

Remove some useless 'return' statements.

Remove some useless 'return' statements.
Add a blank line between functions.

Remove some useless 'return' statements.
Fix style and alignment.

Remove some useless 'return' statements.
Fix style.

Remove some useless 'return' statements.
Add a blank line between functions.

Remove some useless 'return' statements.

Remove some useless 'return' statements.

Remove some useless 'return' statements.
Submitted by: jailletc36
Reviewed/backported by: jim


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mod_ssl: fix build with openssl < 0.9.8m (missing semicolon).
Reported by: Petr Gajdos <pgajdos suse.cz>
Submitted by: ylavic
Reviewed/backported by: jim


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add a mod_headers condition clause expression example



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PR58764: python example for sha1 password hashes

Submitted By: Dave Hall <skwashd gmail.com>



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PR58761: developer doc improvements.

Submitted By: Luca Toscano
 



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r1715014 somehow put it in 2.4.17, whereas it was really backported in 2.4.18.

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only the recently added 2.4.17 Protocol API's) may still be in flux,
until the group has concensus on the API behavior.



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merge from trunk:removing HTTP_HEADER output filter on upgraded connections, so timeouts do not send http/1.1 responses any more

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h2_from_h1: To avoid any further confusion, r->err_headers should be cleared
once merged into r->headers_out.


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mod_http2: merged from trunk, sending out push promises *before* the stream response to make client handling of preload links easier

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