replacement for ProxyPass /path ! when ProxyPass is in
location context.



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r1773397 had a regression and the whole thing is fishy
to shoehorn the current ProxyPass ! syntax into.



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Address SSL_CONF_CTX leak in proxy_ctx.



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Need to separate follow up related to r1740928 and co from the one related to
r1781187.


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mod_http2: fix for crash when running out of memory. Initial patch by Robert Swiecki <robert@swiecki.net>



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The ssl_util_thread_*() functions are not necessary with openssl-1.1+



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Tested with valgrind and --with-ssl shared/static.



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Don't enable mod_crypto in reallyall builds if we don't have a dev
version of APR-util (or APR 2).

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When compiling against APR < 1.6, the actual error message was buried in
unknown type errors from mod_crypto.h. Don't include that file at all if
we're going to error out anyway.

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  remoteip_hook_pre_connection): Reference the filter by handle rather
  than name (avoiding tree lookup by name on use).


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  by moving deference of header array via a different pointer type 
  ("type-punning") out of line.


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

PR: 60404 
Follow up of: http://svn.apache.org/r1780907



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committing for discussion purposes to trunk.  I have reopened PR60458 because
I am tempted to revert the entire thing, it was not really a release-to-release
regression because the reporter arbitrarily used a new 2.4 syntax and the semantics
were unclear.

It is useful to have global exceptions apply to per-location proxypass, but it totally
breaks the "fast" lookup part of it.



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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.



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mod_http2: update after backport



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mod_http2: do not attempt to send responses on aborted slave connections.



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  *) mod_http2: regression fix on PR 59348, on graceful restart, ongoing 
     streams are finished normally before the final GOAWAY is sent. 
     [Stefan Eissing, <slavko gmail.com>]



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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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