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merged mod_md relevant parts of 1818030,1818120,1818308,1818725,1818792,1818849,1819799,1819854,1819943,1820036,1820310,1820312 from trunk


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No need to reset Stefan\'s vote I guess...


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Backport of r1820101 from trunk plus year
update in docs/manual/style/xsl/common.xsl.


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merge of 1804530,1804531,1805186,1806939,1807232,1808122 from trunk.

Backport of mod_md support in mod_ssl.



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Fix upgrading examples

 - providers are case sensitive
 - description didn't match example / 2.2 didn't match 2.4.

Submitted by: Hank Ibell
Committed by: covener




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PR#56457 included.


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core: silently ignore a not existent file path when IncludeOptional
     is used.

In https://bz.apache.org/bugzilla/show_bug.cgi?id=57585 some use cases
were reported in which IncludeOptional seems to be too strict in its
sanity checks.

This change is a proposal to relax IncludeOptional checks to silently
fail when a file path is not existent rather than returning SyntaxError.

Submitted by: elukey
Reviewed by: elukey, jim, niq


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event: better apr_pollset_add() failure handling to avoid an (very unlikely)
worker vs listener race condition.



Follow up to r1809273: CHANGES entry.


Submitted by: ylavic
Reviewed by: ylavic, jim, covener


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Merged /httpd/httpd/trunk:r1818308,1818725,1818792,1818849



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clarify/reword RegisterHTTPMethod and add some seealso's





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Suggest other commits for this backport

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withdrawl proposal of blocking confusing non-global DEFINE



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:


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