Avoid unnecessary code (the deprecation macro wrapper itself emits unused args
warnings) in OpenSSL 1.1.0.

(Backs out and documents avoidance of _free()ing NULL references.)

Backports: r1783317,1783318,1783434,1783438



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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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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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