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Patch from Yann after a discussion on the dev@ mailing list. 
ap_scan_script_header_err_core_ex is now using apr_date_parse_rfc 
in order to recognize non-GMT datestr following RFC822/1123
and transforming them to GMT rather than replacing the value
with GMT now (that could add httpd's processing time to the
original value). Logging has also been improved from my initial
solution.
 


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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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