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It has been reported multiple times that nested
If/ElseIf/Else sections are not evaluated but
silently ignored.

This patch adds a simple recursion to the ap_if_walk
logic in order to allow arbitrary nested configs.
The overhead seems negligible compared to the actual
version of the ap_if_walk, but more expert feedback
is surely needed since this code gets called for every
HTTP request.

Tests are going to be added to t/apache/if_sections.t



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Where Accept-Lanuage is da Q=1 and ru Q=1, leaving these out of the priority
list results in English as the tie-breaker, which is incorrect.



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mod_http2: update after backport



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mod_http2: fixed possible deadlock that could occur when connections were 
     terminated early with ongoing streams. Fixed possible hanger with timeout
     on race when connection considers itself idle.



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That allows to upgrade to jboss-remoting for example
or to run an HTTP/1.1 backend that needs to upgrade to
WebSocket.
See also:
 https://issues.jboss.org/browse/JBCS-254
 https://issues.jboss.org/browse/JBCS-291


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A configtest isn't useful if you're just trying to get compile settings.
Move the settings dump up to just after ap_read_config(), which has
already done the minimum necessary to figure out which MPM is in use.

Even if ap_read_config() failed, still print as many compile settings as
we can. The user will see the error log entry on stderr.

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Start from 10027 to match the current trunk (r1791845), which will be
merged into shortly.

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This should help during testing and debugging. Use APLOG_NOTICE for now,
until we fix PR60999, so that people can actually see the log message.

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This is most likely a follow-up to r1628833.

At some point during the OpenSSL 1.0.2 beta, the contract for custom
extension callbacks changed from "returning -1 skips the extension" to
"returning -1 will issue a TLS fatal alert". This caused mod_ssl_ct to
abort TLS connections that it intended to ignore. Zero is the correct
return value for "do nothing" in 1.0.2.

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LanguagePriority by a first-order comparison and drop negligable translations
from our ordered priority preference list entirely.

A better comparison would be total number of documents in-sync, or some
convoluted weight ordering each document by which are more in sync than
others. Leaving that puzzle to an interested hacker.


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update after mod_http2 backport.



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mod_http2: normalize zombie slot state before pushing it on the free list.



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...but at the moment, this won't actually get logged unless you're
running in debug mode, due to an unrelated bug (PR60999).

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CRYPTO_THREADID_set_callback() is write-once, so if mod_ssl is unloaded
and reloaded into a different address, we'll crash if OpenSSL wasn't
also unloaded and reloaded at the same time. This can happen if another
module or library is using OpenSSL as well.

- OpenSSL 1.1.0 isn't affected.
- Certain platforms (Windows, BeOS, and POSIX-compliant systems) can
  make use of the default THREADID callback in OpenSSL 1.0.x.
- If the deprecated CRYPTO_set_id_callback() is available, we can use it
  instead of CRYPTO_THREADID_set_callback().

Otherwise, we have to fall back to CRYPTO_THREADID_set_callback(), but
hopefully that applies to a small percentage of users at this point.

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Mark the things that are busted.

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Should make it easier to see what's going on in the next few changes.

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mod_http2: MaxKeepAliveRequests now limits the number of times a 
     slave connection gets reused. 



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On platforms where the APR_ASCII_LF != '\n', like EBCDIC systems,
strmatch or pcre patterns from the source or config will be in
the native encoding, and this module will really only work on 
content in the native encoding.

(mod_substitute runs before mod_charset_lite for a similar reason)

I thought #if APR_CHARSET_EBCDIC or even #ifdef __MVS__ was overkill
here. 




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mod_http2: client streams that lack the EOF flag get now forcefully
     closed with a RST_STREAM (NO_ERROR) when the request has been answered.



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mod_http2: only when 'HttpProtocolOptions Unsafe' is configured, will
     control characters in response headers or trailers be forwarded to the
     client. Otherwise, in the default configuration, a request will eiher 
     fail with status 500 or the stream will be reset by a RST_STREAM frame. 



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Increase the number of threads from three to ten. Patch by rjung.

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This is step one for fixing, or at least mitigating, PR60947. Determine
which platforms can use the default OpenSSL (1.0.x) threadid-callback,
by recording the address of errno for several threads and testing that
they're all different.

The result of this test is put into the new macro,
AP_OPENSSL_USE_ERRNO_THREADID.

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do not recycle the socket.



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mpm_winnt: always invoke ap_lingering_close() at connection end.



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