behavior in a routine that sends <DAV:response>'s to the output filters.

The dav_send_one_response() function accepts the current head of the output
filter list as an argument, but the actual head can change between calls to
ap_pass_brigade().  This can happen with self-removing filters, e.g., with
the filter from mod_headers or mod_deflate.  Consequently, executing an
already removed filter can either cause unwanted memory usage or incorrect
behavior.

This patch changes the signature of the existing mod_dav's public API,
dav_send_one_response(), because this API is not yet a part of any 2.4.x
release.

* modules/dav/main/mod_dav.c
  (dav_send_one_response): Accept a request_rec instead of an ap_filter_t.
   Write the response to r->output_filters.
  (dav_send_multistatus, dav_stream_response): Update these calling sites
   of dav_send_one_response().

* modules/dav/main/mod_dav.h
  (dav_send_one_response): Adjust definition.


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per http://httpd.apache.org/docs/2.4/mod/core.html#comment_5866

kernel.org links here.



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We still need to kill kept-alive connections in normal/expiry processing if
the workers are busy or dying.



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apr_pollset_wakeup(), when implemented, to signal the listener according to the
next timers or timeout queues expiry (updated at insert and maintenance time).



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We don't need external locking since it's created with APR_POLLSET_THREADSAFE,
hence reduce those sections to the lowest cycles possible.

A spinlock may be interesting instead of the mutex now, we won't block and the
TO_QUEUE_*() and process_timeout_queue() operations are fast...



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and move TO_QUEUE_*() macros to functions.


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Set timestamp before enqueing the timer on resume.


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To help out users when debugging ProxyPass and ProxyPassMatch, log all
match attempts (at trace2), as well as matches that are either
successful or explicitly disabled (at trace1).

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disables Brotli compression for a particular request.

This mimicks how mod_deflate handles the 'no-gzip' env variable, and
should allow seamless migration for configurations that use it.


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directive.


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Don't add -lbrotlienc to the MOD_LDFLAGS unconditionally.  And, when
adding it, use MOD_BROTLI_LDADD to avoid linking all filter modules
against this library.


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This new module supports dynamic Brotli (RFC 7932) compression.  Existing
mod_deflate installations can benefit from better compression ratio by
sending Brotli-compressed data to the clients that support it:

    SetOutputFilter BROTLI_COMPRESS;DEFLATE

The module features zero-copy processing, which is only possible with the
new API from the upcoming 1.0.x series of brotli [1].  The Linux makefile
works against libbrotli [2], as currently the core brotli repository doesn't
offer a way to build a library [3].  Apart from that, only the CMake build
is now supported.

[1] https://github.com/google/brotli
[2] https://github.com/bagder/libbrotli
[3] https://github.com/google/brotli/pull/332


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more apr_uint32_t usage where appropriate, signed/unsigned warning detox, stream reset clears buffers immediately

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