* silencing gcc uninitialized warning
 * refrainning from apr_table_addn() use since pool debug assumptions are in conflict
 * adding more assertions
 * copy-porting changes to base64 encoding code from mod_md



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Silencing a gcc uninitialized warning.



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     should not be involved, e.g. challenge setup by another ACME client.


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Once again :p


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While reading PR 62422 I noticed that ProxySet's available
contextes list only 'directory', that looks odd:

AP_INIT_RAW_ARGS("ProxySet", set_proxy_param, NULL, RSRC_CONF|ACCESS_CONF



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both help2man and the standard DocBook XSL stylesheets for man output.


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While working on http://svn.apache.org/r1833875
I learned a ton of non trivial things about
the output filter chain and how to design a filter,
and I thought to report them as a separate section
of the output filters doc page. Feedback is welcome
for inaccuracies or wrong understanding :)



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'_' was not permitted in hostnames since 2.4.25's "HTTP Strict"
changes.



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mod_http2 is no more marked as experimental.

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Add a reference to 2.5 for regex within AuthName and update the misleading 2.4.x reference in AuthType

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mod_http2 is nor more experimental.

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Prefer <module> to hard coded <a href=...>
Add some direct links to directives
Split long lines

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Change position of #loadModule mod_proxy_http2 to keep alphabetical order.

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Add more precise info and warn notes about
variable interpolation.

PR: 62477



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Function used as 'apr_reslist_destructor' when calling 'apr_reslist_create()' should have the following prototype:

apr_status_t (*apr_reslist_destructor)(void *resource, void *params, apr_pool_t *pool);

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   - break long lines
   - remove un-needed 'return' statement
   - fix the position of the first { in function

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Fix a missed s/backconn/backend connection/ in an un-likely error path.

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The corresponding code was added in r1807709 but reverted in r1827760.
The compatibility note was added as part of r1807869 but was not removed when the code has been axed.

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