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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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APACHE_MODULE macro, as a comma separated list, e.g.

APACHE_MODULE(proxy_http2, [...], [proxy,http2])

will evaluate the availability of mod_proxy, followed by mod_http2


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Be more consistent:
   - add space between (if|while) and \(
   - place of 'break ' statement

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This has been tested using a slighly modified example taken from:
    https://blogs.oracle.com/basant/entry/using_mod_sed_to_filter
(OutputSed "s/.\*//"             has been changed in                OutputSed "s/.*//")

OutputSed "/Sunday/ {"
OutputSed "h"
OutputSed "s/.*//"
OutputSed "N"
OutputSed "s/\^.//"
OutputSed     "/Monday/ {"
OutputSed         "x"
OutputSed         "s/Sunday/Monday/"
OutputSed         "x"
OutputSed         "s/Monday/Tuesday/"
OutputSed         "H"
OutputSed         "g"
OutputSed     "}"
OutputSed "}"

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