Add Proxy100Continue directive to allow for 100-continue forwarding opt-out.


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  restore SSL verify state after PHA failure in TLSv1.3.

Submitted by: Michael Kaufmann <mail michael-kaufmann.ch>


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     non-privilegded apache user to be able to read them. See github issue
     <https://github.com/icing/mod_md/issues/117>. [Stefan Eissing] 



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rephrase to account for e.g. AddHandler which isn't about response metadata.



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fails in maintainer mode w/ __attribute__(nonnull))

util.c:576:10: error: nonnull parameter 'name' will evaluate to 'true'
on first encounter [-Werror,-Wpointer-bool-conversion]




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  We need to have sslconn->dc set correctly when we want to
  init sslconn, but we need to allocate memory for it first.


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opt-out w/ `MergeSlashes OFF`.



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The SSL dir config of proxy/backend connections is stored in r->per_dir_config
but those connections have a lifetime independent of the requests they handle.

So we need to allow the external ssl_engine_set() function to reset mod_ssl's
dir config in between proxy requests, or the first sslconn->dc could be used
after free for the next requests.

mod_proxy can then reset/reinit the request config when recycling its backend
connections.


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PR 63095 (Masahiro IMABAYASHI, <masahiro.imabayashi sony.com>)

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Uplift of relevante changes of r1855479 in branches/2.4.x, re disappearance of h2_ngn_shed.* sources.


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mod_mime: Add `MimeOptions` directive to allow Content-Type or all metadata
detection to use only the last (right-most) file extension. 



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maintainer-mode for later versions of clang module compile specific
(we will still SEE the errors though when buidlin)


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No error here, just debug information.


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Implies a Major bump.


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We need not remember each child's bucket number in SHM for restarts, for the
lifetime of the httpd main process the bucket number can be bound to the slot
number such that: bucket = slot % num_buckets.

This both simplifies the logic and helps children maintenance per bucket in
threaded MPMs, where previously perform_idle_server_maintenance() could create
or kill children processes for the buckets it was not in charge of.


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     in play, the proper HTTP/2 stream reset did not trigger with H2_ERR_HTTP_1_1_REQUIRED.
     Fixed. [Michael Kaufmann] 



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     padding of HTTP/2 payload frames. 'numbits' is a number from 0-8,
     controlling the range of padding bytes added to a frame. The actual number
     added is chosen randomly per frame. This applies to HEADERS, DATA and PUSH_PROMISE
     frames equally. The default continues to be 0, e.g. no padding. [Stefan Eissing] 
  
  *) mod_http2: ripping out all the h2_req_engine internal features now that mod_proxy_http2
     has no more need for it. Optional functions are still declared but no longer implemented.
     While previous mod_proxy_http2 will work with this, it is recommeneded to run the matching
     versions of both modules. [Stefan Eissing]
  
  *) mod_proxy_http2: changed mod_proxy_http2 implementation and fixed several bugs which
     resolve PR63170. The proxy module does now a single h2 request on the (reused)
     connection and returns. [Stefan Eissing]



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The error is: "filter-expr(funcall(current, []), [pred(=(step("attribute", 39), literal-expr(section)))])'. Cause: Erreur lors de la vérification du type de l'expression 'filter-expr(funcall(current, []), [pred(=(step("attribute", 39), literal-expr(section)))])"

This takes us 1 step closer to use Ant 1.9+ and remove Xerces and Xalan from the build chain.


Patch tested with the current doc build chain (Ant 1.6.5 + Xerces + Xalan) on the 2.4.x branch.
Even if actually we don't have any "<Foo>" and "Foo" directives, I've checked that the doc is built correctly in such a case.

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     to trigger immediate shutdown of backend connections. This is now always signalled
     by mod_http2 when the the session is being released. 
     proxy_http2 now only sends a PING frame to the backend when there is not already one
     in flight. [Stefan Eissing]

  *) mod_proxy_http2: fixed an issue where a proxy_http2 handler entered an infinite 
     loop when encountering certain errors on the backend connection. 
     See <https://bz.apache.org/bugzilla/show_bug.cgi?id=63170>. [Stefan Eissing]



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