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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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aborts the build on missing dependencies, with a local override of the
module_selection as 'most', and module_default of the same shared|static
model that was requested through --enable-proxy.

[For trunk, we need to reevaluate the 'most' condition of some of the more
esoteric modules, and simply drop the module_default override; where a user
wants to enable -only- mod_proxy, plus one proxy mechanism, the legacy 2.4.x
behavior retained by this patch is nuts. For one example,
  --enable-modules=few --enable-proxy-yes --enable-proxy_http
is a completely specific and legitimate syntax --- adding 10 other proxy
providers in response to this syntax is absurd.]



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also hit old DEBUG messages.



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disable the module. This forces the module logic to emit a warning of the
missing dependency; changes the output from

checking whether to enable mod_proxy_hcheck... no

to

configure: WARNING: "mod_watchdog is disabled but required for mod_proxy_hcheck"
checking whether to enable mod_proxy_hcheck... no (disabled)




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mod_proxy_http2: fixed retry behaviour when proxy engine needs to retry its base request on a new connection



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