Only keep changes related to sycnh with trunk

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Spotted by David Eisner  in online doc

+ synch with trunk

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mod_rewrite: Add QSL|qslast flag to allow rewrites to files with 
literal question marks in their names. 

PR 58777. 





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reverted in trunk in r1732896. The fix is bad and breaks old loop
avoidance.

Reviewed By: covener, ylavic, jim



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Backporting documentation commits from trunk (new mod_ssl note about ECC): r1734058,r1734060,r1734067,r1734069

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Note that Timeout on a new connection can be "hidden" by an
AcceptFilter.




Timeout scenarios are more of an unordered list.




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mixmatched sections reported in comments




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mod_ssl: when SSLVerify is disabled (NONE), don't force a renegotiation if
the SSLVerifyDepth applied with the default/handshaken vhost differs from
the one applicable with the finally selected vhost.

Submitted by: ylavic
Reviewed/backported by: jim


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Fix crash in ap_mpm_pod_check call caused by NULL dereference of its parameter
when starting httpd as single process (httpd -X).


Revert changes on mpm_event and mpm_worker from r1711479.
The POD is not used in one process mode for those MPMs.

Follow up to r1711479 and r1733064: CHANGES entry.
Submitted by: jkaluza, ylavic, ylavic
Reviewed/backported by: jim


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mod_proxy: Play/restore the TLS-SNI on new backend connections which
had to be issued because the remote closed the previous/reusable one
during idle (keep-alive) time.


mod_proxy: follow up to r1729826: really copy conn->ssl_hostname.

mod_proxy: follow up to r1729826 + r1729847.
Adjust stacked ssl_hostname maximum size.

mod_proxy: follow up to r1729826 + r1729847 + r1732986.
Don't use magic constants.
Submitted by: ylavic
Reviewed/backported by: jim


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event: slave connection init, vhost early config
Submitted by: icing
Reviewed/backported by: jim


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but the first fix is bad.


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             backported in r1729495 but without this "server/core.c" change)



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mod_proxy: add missing APLOGNO()s.
Submitted by: ylavic
Reviewed/backported by: jim


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