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Add more info about the role of Timeout for mod_cgi

PR 60404 asks if the Timeout directive is related to
the amount of time to wait for the entire CGI script's
output or only the first byte received.
Checking in mod_cgi.c -> cgi_bucket_read shows a
apr_pollset_poll that should support the latter.



Reworded the Timeout documentation about mod_cgi[d]

After a chat with Yann and Eric on dev@, we agreed to
simplify the description.



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Merge of r1779979,1780159,1780576,1780596 from trunk:
M    modules/http2/h2_bucket_beam.c
     fix for possible duplicate free of send/recv pools
M    modules/http2/h2_from_h1.c
     suppress generating responses on aborted slave connections
M    modules/http2/h2_session.c
     regression: stream ongoing streams on graceful shutdown to the end
M    modules/http2/h2_version.h



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This commit was made thanks to the tool and PR
created by Lajos Veres (vlajos) on github.

PR: https://github.com/apache/httpd/pull/6
Tool: https://github.com/vlajos/misspell_fixer



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Reworked and added examples to the HTTPProtocolOptions doc

On #httpd-dev a user gave us some hints about what kind of
things would have been great to see in the HTTPProtocolOptions
directive's documentation, so I tried to apply them all.

I also added some examples taken from http_strict.t and tested
a bit. I didn't follow completely the complete change-set of
the HTTPProtocolOptions directive, so please review the change
and let me know if anything is wrong or missing.


Submitted by: elukey


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Added more details to mod-proxy-http2's doc

Reworked mod-proxy-http2's documentation after Stefan's suggestions

Submitted by: elukey


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Merge r1779743,1779896,1779972 from trunk.

mod_http2: fixes PR60599, sending proper response for conditional requests
answered by mod_cache. [Jeff Wheelhouse, Stefan Eissing]



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  *) mod_http2: rework of stream resource cleanup to avoid a crash in a close
     of a lingering connection. Prohibit special file bucket beaming for
     shared buckets. Files sent in stream output now use the stream pool
     as read buffer, reducing memory footprint of connections.
     [Yann Ylavic, Stefan Eissing]
     



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the -R option has been gone for ages.


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  *) mod_http2: streaming of request output now reacts timely to data
     from other streams becoming available. Same for new incoming requests.
 


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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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