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http: allow folding in check_headers(), still compliant with RFC 7230 (3.2.4).


http: follow up to r1777460.
We MUST unfold outgoing HTTP headers in any case, "message/http" is for
inner content.
Submitted by: ylavic
Reviewed by: ylavic, covener, wrowe


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      once-per-restart msg (I guess the concern was that the RNG
          could block after this message)
                AH01757: generating secret for digest authentication ...
                    trunk patch: This was fixed in trunk as a trivial part of http://svn.apache.org/r1492395
                        2.4.x patch: Just change the loglevel to DEBUG.
                            +1: covener, jim, wrowe



Submitted by: covener
Reviewed by: covener, jim, wrowe


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fix crash in util_fcgi.c

 *) mod_proxy_fcgi, mod_fcgid: Fix crashes in ap_fcgi_encoded_env_len() when
    modules add empty environment variables to the request. PR60275.
    [<alex2grad AT gmail.com>]

Submitted By: <alex2grad AT gmail.com>]
Committed By: covener



Submitted by: covener
Reviewed by: covener, jim, wrowe


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CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability. **



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mod_proxy_{ajp,fcgi}: Fix a possible crash when reusing an established
backend connection, happening with LogLevel trace2 or higher configured,
or at any log level with compilers not detected as C99 compliant (e.g.
MSVC on Windows).


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


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(r1772490 in trunk)

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(r1739569 in trunk)

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backport of latest mod_http2 related changes.



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The typo is already fixed in trunk

+ synch a bit with trunk (tab vs space, trailing space)

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Backport of r1776956 from trunk.


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mod_http2: adding support for MergeTrailers directive. 

mod_http2: limiting DATA frame sizes by TLS record sizes in use on the     
    connection. Flushing outgoing frames earlier. 



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Sébastien Santoro (dereckson AT espace-win.org)
sent a bug report about one typo in core.xml
and I executed the aspell tool on the whole file.



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