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Backport r696614 from truk

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ap_proxy_determine_connection modifies the url if we are retrying the result we should retry using the orginal url.

Submitted by: jfclere
Reviewed by: jim


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Translated by: Nilgün Belma Bugüner <nilgun belgeler.org>
Reviewed by:  Orhan Berent <berent belgeler.org>

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fix MaxClients description (r692325, r692459) suggested by wrowe

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Note modules such as mod_headers affect %{Foobar}i

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unfortunately named index files


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* Recheck again if idle workers are still available when we are signaled that
  they are. This is needed since it can happen that we are signaled by a
  worker thread that went idle but received a context switch before it could
  tell us. If it does signal us later once it is on CPU again there might be
  no idle worker left. See
  https://issues.apache.org/bugzilla/show_bug.cgi?id=45605#c4

PR: 45605
Submitted by: Denis Ustimenko <denusk gmail.com>
Reviewed by: rpluem, jim, gregames


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this is clearly an improvement.  but I am partial to the Event version which
eliminates unneeded condition signalling.


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