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mod_http2: improved cleanup of connection/streams/tasks to always
     have deterministic order regardless of event initiating it. Addresses
     reported crashes due to memory read after free issues. 



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Overthinking our interaction with APR is a deep hole we don't want to go down.
For 2.next, of course we will throw away all this code, but this is a stopgap
with a future #define compatibility wrapper once we get that far.

Now, with extra history...




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mod_http2: backport of 1.5.7



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Reviewed. build the html file

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Synch with trunk.

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(r1656259 has introduced many updates. It should be backported before trying to get r1744460)

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such that disabling either disables both, and that enabling either will
trigger the more comprehensive SSLProxyCheckPeerName behavior.

Only a single configuration remains to enable the legacy behavior, which
is to explicitly disable SSLProxyCheckPeerName and enable SSLProxyCheckPeerCN.

Changes to the proxy config directives leads us to a different 2.4 fix...
https://github.com/wrowe/patches/blob/master/fix_proxy_check_peer-2.4.x.patch

Backports: 1746647
Reviewed by: wrowe, icing, rpluem



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* server/core.c (set_document_root): Improve error message for
  inaccessible docroot.

Submitted by: jorton
Reviewed/backported by: jim


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mod_rewrite: adding h2:// and h2c:// proxy schemes to absolute uri detection, patch by Evgeny Kotkov
Submitted by: icing
Reviewed/backported by: jim


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Save a few bytes in the conf pool.

The directive's names don't need to be duplicated in this pool when parsing the configuration file.

Either they match a known directive name and we can use it directly if needed. Otherwise, it is still possible to make a copy afterwards.
Submitted by: jailletc36
Reviewed/backported by: jim


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Add the <!--#comment ... --> syntax.
Idea from Rob.
Submitted by: jailletc36
Reviewed/backported by: jim


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directly to that section.



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ab: caseless matching for http heaers



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Synch with trunk, merge r1628690

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