Bring SNI behavior into better conformance with RFC 6066:

- no longer send a warning-level unrecognized_name(112) alert
  when no matching vhost is found (PR 56241)

- at startup, only issue warnings about IP/port conflicts and name-based
  SSL vhosts when running with an OpenSSL without TLS extension support
  (almost 5 years after SNI was added to 2.2.x, the
  "[...] only work for clients with TLS server name indication support"
  warning feels obsolete)

Proposed by: kbrand
Reviewed by: jorton, ylavic


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in mod_remoteip.c. PR 55962.


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if backend->close is set too early, proxy_util.c will close it right 
away and then blow away the field.


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             input filter, forward the FLUSH but keep reading should EOS/more
             follow (should not happen, but mod_deflate won't fix it).


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The init_server hook is responsible for telling why init
failed.


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several stages of initialization and connection handling.  See
mod_ssl_openssl.h.

This is enough to allow implementation of Certificate Transparency
outside of mod_ssl.


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             buckets are out (including EOS). PR 46146.


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  post-rotate programs.


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renamed


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* make async websockets tunnel opt-in
* add config for how long we block a thread in asynch mode
* add config for a cap on the synchronous path
* avoid sending error responses down the upgraded tunnel



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Submitted By: covener, ylavic, Edward Lu
Commited By: covener



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only manipulate c->input_filters no matter what we pass. We need to make
copies of c->input_filters after, not before, it skips over reqtimeout.

Note: reqtimeout doesn't really interfere today with normal operation,
but this is misleading/confusing when dealing with other
wstunnel issues.



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     because we need to handshake every time. PR 55890.
     [Eric Covener]



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The immediate use is for a SSL-related module which works
on the backend proxy connection to be able to "leak" information
into the client r for logging.

This could be useful with other proxy scheme handlers.


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a likely candidate for someone to flip later.
 


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to 2.4.  Provide DeflateAlterETag directive to choose between 
2.2 behavior, 2.4 behavior, or dropping ETag from the compressed
representation.

Preserves 2.4 default which breas 304 responses for compressed content.



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