buildconf's behavior is a little complicated (and was made more so with
apr-config mode), so add some self-documentation.

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Previously we required copying the APR (and APR-util) source code into
srclib or some other location on disk in order to build httpd directly
from source. This is annoying if you're on a distribution that already
has the required files in its APR dev packages.

Practically speaking, if you're not building an official distribution
tarball, you only need the following files:

1) config.guess
2) config.sub
3) find_apr.m4
4) find_apu.m4
5) PrintPath

1 and 2 come from automake. 3 and 4 are included in some distributions'
(e.g. Debian's) development packages for APR/-util. That leaves
PrintPath, which has not changed meaningfully in over a decade and is
checked in completely here.

Passing an apr-config executable to buildconf's --with-apr option will
now enable a mode in which the above files (minus PrintPath) are copied
from their respective homes, removing the need for APR sources on disk.
Otherwise, if a source tree is passed, the current behavior is retained
and all of the above files are copied from APR directly.

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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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mod_http2: fixing h2_bucket_beam to avoid duplicate calls to cleanup functions.
[Yann, Ylavic, Stefan Eissing]



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  *) core: %{DOCUMENT_URI} used in nested SSI expressions should point to the
     URI originally requsted by the user, not the nested documents URI. This
     restores the behavior of this variable to match the "legacy" SSI parser.
     PR60624. 

Submitted By [Hank Ibell <hwibell gmail.com>]



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



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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.



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M    modules/http2/h2_bucket_beam.c
     - renaming: former red/green is now send/recv, better to read
M    modules/http2/h2_from_h1.c
     - produce a response also when body it totally absent (PR 60599)
M    modules/http2/h2_session.c
     - more work on cleaner connection shutdown



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mod_http2: update after backport



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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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Parse/validate response bodies.



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Use the thread pool everywhere for the needs/lifetime of the request to
the backend.



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reverting change 1779525.



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mod_http2: decoupling lifetime of mplx pool from h2_session which messed up the cleanup ordering.



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the -R option has been gone for ages.


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  *) mod_http2: change lifetime of h2_session record to address crashes
     during connection shutdown. [Yann Ylavic, Stefan Eissing]



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Keep QUEUE_APPEND()+pollset_add() or QUEUE_REMOVE()+pollset_remove() atomic.

Otherwise when a worker adds an entry in some queue (e.g. KA, lingering), it
might race with the listener in the time between the mutex is released and the
pollset is updated; meanwhile the listener might process the queue and find an
entry no yet in its pollset.

For the lingering queue, the entry could then have been used after its pool
destroyed.


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in https://github.com/google/brotli/commit/fe9f9a9

There's a typo in the upstream commit [1] (s/brotlicommon/libbrotlicommon)
that currently produces an unusable libbrotlienc.pc file, but hopefully
this is going to be fixed there.

[1] https://github.com/google/brotli/commit/fe9f9a9#diff-af3b638bc2a3e6c650974192a53c7291R409


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