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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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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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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the "Serving pre-compressed content" section of the docs.

Generally speaking, this section would benefit from a rewrite pointing
out how to configure a mod_deflate + mod_brotli configuration with
precompressed contents, but for now at least fix the mistakes in the
configuration.


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in the documentation (BrotliCompressionQuality, BrotliCompressionWindow,
BrotliCompressionMaxInputBlock, BrotliAlterETag).


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in the documentation.

Currently, mod_brotli only allows dynamic output compression, and doesn't
have the server-side decompression capability.


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the documentation.

The previous description explained the semantics of this variable as
if it has been a (non-existing) "force-brotli".


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mod_http2: explicit int conversions to silence warnings in mod-h2 build.



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that has been referring to httpd 2.2.x.

There's no mod_brotli in 2.2.x.

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The 0.6.0 version has just been released [1], and it contains the
necessary API required for mod_brotli.

[1] https://github.com/google/brotli/releases/tag/v0.6.0

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update after mod_http2 backport



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mod_proxy_http2: no longer mapping link headers when preserve host is on.



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mod_proxy_http2: 1 is true.



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mod_proxy_http2: Reliability of reconnect handling improved.



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mod_http2: fixed two deadlocks introduced by removing nested mplx locking earlier.



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(s/RemoteIPProxyProtocolDisableNetworks/RemoteIPProxyProtocolExceptions/)

Use cmd->cmd->name instead to be future proof.

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mod_http2: less and more granular mutex use for improved performance.



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mod_http2: code cleanup after eliminating nested locks, giving worker slots their own mutex.



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mod_http2/mod_proxy_http2: less read attempts on bucket beams that already
     delivered EOS/headers. Fixed bug in re-attempting proxy request after 
     connection error.



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