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mod_proxy_fcgi: Fix occasional high CPU when handling request bodies.

Submitted by: trawick
Reviewed by: covener, ylavic


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* event MPM: fix a race where a worker looks at a conn_rec after it might be
  in use by another thread or may have been freed and 
  re-allocated.

Submitted By: Edward Lu



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authnzldap: support "none" as a filter to suppress using a search filter,
which is required by some mainframe security products serving native
registry over LDAP.



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mod_lua backport: Make httpd find lua 5.2 headers/lib during configure if present on the system (mod_lua is fully compatible with 5.2).

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the busy-loop patch, 3.6-4.7% CPU with the busy-loop patch


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.gen.tr>
Reviewed by:  Orhan Berent <berent belgeler.gen.tr>

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agreed in the thread following r1583175



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Follow up to r1604336: Comment out hooks whose only references are
now commented out, fixing a "-Wunused-function" warning


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Follow-up to r1601076: Provide documentation for -m option.


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mod_deflate: fix decompression of files larger than 4GB. According to RFC1952,
Input SIZE (compLen) contains the size of the original input data modulo 2^32.

PR: 56062
Submitted by: Lukas Bezdicka



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Merge r1572655, r1572663, r1572668, r1572669, r1572670, r1572671, r1573224, r1586745, r1587594, r1587639, r1590509 from trunk.


Commit 1 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Handle Zlib header buffering in the inflate output filter :
- add the new deflate_ctx_t fields needed to re-enter the Zlib header parsing,
- introduce the new consume_zlib_flags() function to parse/consume the ZLib flags (will be used by the other filters too),
- use it to handle incomplete header in the output filter (deflate).

This alone fixes PR 55666, but the issue remains for PR 46146 (inflate/deflate input filters), hence the following patches.


Commit 2 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Handle Zlib header buffering in the inflate input filter :
- loop until all the header is received,
- handle non blocking reads returning empty brigade,
- fix a double ap_get_brigade() when an EOS brigade is encountered while reading the header,
- in that case and no data was received so far, don't return an error but SUCCESS with the EOS, otherwise fail,
- don't remove the Content-Length and Content-MD5 headers until some data is read.

Still does not handle Zlib flags for now, next commits.


Commit 3 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Handle Zlib validation bytes buffering (CRC + length) in the inflate input filter :
- use validation_buffer and validation_length as state,
- loop until all the bytes are received.


Commit 4 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Handle non blocking reads which would block in the inflate input filter (not an error).


Commit 5 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Handle Zlib flags in the inflate input filter as in the output filter, using consume_zlib_flags().


Commit 6 on 6 to fix reentrance (incomplete Zlib header or validation bytes) in mod_deflate's output and input filters.
PR 46146 (patches from duplicated PR 55666)

Ignore empty buckets and split buckets longer than INT_MAX (since zlib uses 32-bit ints only) in all filters.


mod_deflate: when consuming zlibs flags, APR_INCOMPLETE implies no more bytes available.


mod_deflate: update empty log tags.


mod_deflate: Delay INFLATE input filter's self removal until all the buffered
             buckets are out (including EOS). PR 46146.


mod_deflate: Don't return gzip-ed data when reading FLUSH bucket in INFLATE
             input filter, forward the FLUSH but keep reading should EOS/more
             follow (should not happen, but mod_deflate won't fix it).


mod_deflate: follow up to r1587639.
Don't break the looped brigade when moving the FLUSH bucket to the returned bb
and continue reading.



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Follow up r1573626 with some wordsmithing, a compatibility note,
and indentation.


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mod_proxy: Allow reverse-proxy to be set via explicit handler.

Submitted by: ryo takatsuki <ryotakatsuki gmail com>
Reviewed by: ylavic, jim, mrumph


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1604378 13f79535-47bb-0310-9956-ffa450edef68

ab: support custom HTTP method with -m argument.

PR: 56604
Submitted by: Roman Jurkov <winfinit gmail.com>
Reviewed by: ylavic, trawick, covener

(r1601680 and r1601700 not reflected in mergeinfo due to
a collision with an unrelated trunk change)


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mod_proxy_fcgi: better error messages, and fix an old bug where the error
                condition was forgotten

Submitted by: trawick
Reviewed by: ylavic, covener


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promotions


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- IVM changed to use shm
- More verbose error logging (no functional change)
- Miscellaneous refactoring that was in trunk but not in 2.4.x (no functional change as such)

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Stray whitespace (r1602730 in trunk)

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