...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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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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