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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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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update after backport to 2.4.x



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mod_http2: log tags updated



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mod_http2: move stuff from master connection to worker threads, increase spare slave connections, create output beams in worker when needed.



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mod_http2: fixed problem of forgotten requests when number of connections larger than number of workers. Some code refactor, threads now queued in slot order for vanity reasons, so that the segfaults are more likely at the top and not the bottom.



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mod_http2: better performance, eliminated need for nested locks and thread privates.



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