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Use SNI when available by default, and invert -I logic to now disable it.

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Reviewed by: wrowe, covener, rpluem


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The Last-Modified header coming from a backend FCGI/CGI script is inspected
by util_script.c to enforce RFC2616 (https://tools.ietf.org/html/rfc2616#section-14.29).
The Last-Modified header also needs to be compliant with RFC882/1123 as stated in
https://tools.ietf.org/html/rfc2616#section-3.3.1, and one important assumption that
httpd makes (correctly, as the RFC suggests) is to assume the GMT timezone. If the datestr
returned by the FCGI/CGI script is set with a different timezone, then the value might be considered
"in the future" and replaced with GMT now() as calculated by httpd. Adding a trace log might
help sysadmins while debugging these kind of issues. This is a follow up of r1748379. 
  


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when that value is 'shared'. The 'yes', 'shared', 'static' and 'no' values
are all valid.



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Restore PROXY_WORKER_IS_USABLE() check in ap_proxy_connect_backend(), we must
obviously (un)put backend in error state based on the result of the actual
connect(), and don't change it in ap_proxy_check_backend()...
APR_SUCCESS return by ap_proxy_check_backend(), i.e. a usable worker and an
established connection, is enough for modules to continue w/o calling
ap_proxy_connect_backend(), still.



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Avoid double checking the connection in ap_proxy_connect_backend() when
ap_proxy_check_backend() says it is up and good to go.

This can be done by moving the PROXY_WORKER_IS_USABLE() check in
ap_proxy_check_backend(), since it is called by ap_proxy_connect_backend(),
and not calling the latter if the former succeeded (for the modules using it).


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No visual change

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ap_proxy_check_backend() used at connection reuse time, so remove its last call and deprecate it.

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data available on the backend connection before we reuse it (e.g. PING or SETTINGS change).

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brigade create/destroy.

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before the request is sent.  PR 57832.

ap_proxy_check_backend() can be used before ap_proxy_connect_backend() to try
to read available data (including from the filters), and is called by
ap_proxy_connect_backend() to check the socket state only (as before, still
relevant after ap_proxy_check_backend() due to filter data which may not have
triggered a real socket operation).


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Rework needed.

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s/is_socket_connected/get_socket_connected/ in the !USE_ALTERNATE_IS_CONNECTED
case, and add CHANGE + MMN entries.


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request is sent.  PR 57832.


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Suggested by: Rick Houser <rick.houser jackson.com>


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