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Fix layout of <highlight> to synch with trunk

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proposals for backporting mod_md and related, necessary mod_ssl changes.



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address comment about substitution syntax

http://httpd.apache.org/docs/trunk/mod/mod_substitute.html#comment_7147




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mod_macro: fix usability of globally defined macros in .htaccess files.
PR 57525.

Reverts pre_config hook from r1656669 (happens too late for EXEC_ON_READ), and
ensures ap_macros is reset on restart with a pconf cleanup.

Proposed by: Jose Kahan <jose w3.org>
Reviewed by: ylavic

Submitted by: ylavic
Reviewed by: ylavic, icing, jim


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core, mod_rewrite: introduce the 'redirect-keeps-vary' note
                   to allow proper Vary header insertion when
                   dealing with a RewriteRule in a directory
                   context.

This change is an attempt to fix a long standing problem,
brought up while working on PR 58231. Our documentation clearly
states the following:

"If a HTTP header is used in a condition this header is added
to the Vary header of the response in case the condition
evaluates to true for the request."

This is currently not true for RewriteCond/Rules working in
a directory context, since when an internal redirect happens
all the outstanding response headers get dropped.

There might be a better solution so I am looking forward to
hear more opinions and comments. My goal for a delicate change
like this one would be to affect the least amount of configurations
possible, without triggering unwanted side effects.

If the solution is good for everybody tests will be written
in the suite asap.


Submitted by: elukey
Reviewed by: elukey, icing, ylavic


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Merged /httpd/httpd/trunk:r1811649,1811664,1814118

  *) ab: Make the TLS layer aware that the underlying socket is nonblocking,
     and use/handle POLLOUT where needed to avoid busy IOs and recover write
     errors when appropriate.  [Yann Ylavic]

  *) ab: Keep reading nonblocking to exhaust TCP or SSL buffers when previous
     read was incomplete (the SSL case can cause the next poll() to timeout
     since data are buffered already).  PR 61301 [Luca Toscano, Yann Ylavic]




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Merge of r1813767 from trunk.

mod_http2: avoid unnecessary data retrieval for a trace log. Allow certain
     information retrievals on null bucket beams where it makes sense.



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   - add some links and color highligh
   - remove some <var> (i.e. italic) around parameters that should be written unmodified (On|Off...)

r1813997 in trunk + some small modifications to synch with trunk

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