mod_proxy_http: don't recycle backend connections known to be closed (eg. EOS by close).
This saves a useless ap_is_socket_connected() call when reused.

Submitted by: ylavic
Reviewed/backported by: jim


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Log an error in mod_proxy_http when reading the request body fails.
Follow-up to r1538776 where incomplete bodies are detected and an error returned through the input filters.


Submitted by: ylavic
Reviewed/backported by: jim


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

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

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Move draft-ietf-httpbis-p1-messaging-23 fixes to proposed backport (was being worked) like in 2.2.x, with my +1 vote.

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http://httpd.apache.org/docs/2.4/mod/mod_headers.html#comment_2245



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  *) mod_rewrite: Add RewriteOptions InheritDown, InheritDownBefore,
     and IgnoreInherit to allow RewriteRules to be pushed from parent scopes
     to child scopes without explicitly configuring each child scope.
     PR56153. 

Submitted By: Edward Lu
Committed By: covener

Submitted by: covener
Reviewed/backported by: jim


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