mod_http2: documentation and formatting



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The sections.html doc was missing, in my opinion, a direct
reference to the fact multiple Location blocks matching
a HTTP request will be evaluated in the order in which they
appear in the configuration files (same as Ifs, etc..).

Reworked a bit a single block of text to be a bit more readable.



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promise of a coming future article is not relevant in this new context.


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mod_http2: session pool cleanup at pre_close.



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  *) mod_http2: moving session cleanup to pre_close hook to avoid races with
     modules already shut down and slave connections still operating.



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  does NOT match. In this case val is NULL and we should just set the value for
  the environment variable like in the pattern case.


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  ap_soak_end_container): Constify directive arguments - existing
  callers pass string literals.

* server/core.c (start_cond_section): Remove casts needed for above.


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  no functional change.


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* server/core.c
  (test_ifdirective_section, test_ifsection_section): New callbacks.
  (core_cmds): Define new directives.

* include/http_config.h, server/config.c (ap_exists_directive):
  New function.

* include/ap_mmn.h: Bump MMN minor for above.

* docs/manual/mod/core.xml: Add docs.


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functional change.

* server/core.c (start_cond_section): Factor out from start_if*.
  Adjust to use apr_strmemdup.
  (test_ifmod_section, test_iffile_section, test_ifdefine_section):
  Move container-specific tests into callbacks from start_if*.
  (core_cmds): Adjust <IfFile, <IfDefine, <IfModule to use
  start_cond_section with callbacks.


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when we've failed to detect a charset but successfully fallen back to
config default.
Analysis by Tim Skopnik, patch by niq.


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This is a temporary workaround for a missing compatibility API on
Debian-like systems (and anyone else who doesn't compile with
LUA_COMPAT_MODULE). Ignore any such libraries so we don't fail
confusingly later.

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Pull identical code into the CHECK_LUA_PATH macro.

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  *) mod_http2: stream timeouts now change to vhost values once the request
     is parsed and processing starts. Initial values are taken from base
     server or SNI host as before. 



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mod_proxy_http2: fixed retry behaviour when frontend connection uses 
     http/1.1. 



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Require 127.0.0.1 is not a valid syntax,
fixing it with Require local



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