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Fix r1593664 where I miss read the code and what is performed in "header_inout_cmd()" where arguments are "shuffled" according to the "action" to be performed.

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Merge r1546730, r1583008, r1571369, r1552130, r1578760, r1592615, r1592632, r1595321, r1550302, r1550307, r1585435 from trunk:

fix whitespace in a debug message

s/comment/self-documenting/

normalize an ugly construct which somehow manages to return the correct value

This is annoying to see in a casual "LogLevel debug foo:traceX ..."




Use 'apr_table_setn' instead of 'apr_table_set' when possible in order to save memory.

Follow-up to r1592529:

Define default port for "scgi" schemes (as chosen by
mod_proxy_scgi) in a common location.

Suggested by: jailletc36


fix Doxygen markup error

Submitted by: jailletc36


Tweak a AP_DEBUG_ASSERT condition.
Valid index to use 'req_header_var_names' are 0...6

mod_auth_form: Add a debug message when the fields on a form are not
recognised.


mod_auth_form: Make the trace logging consistent through the notes, session
and form authentication steps.


mod_auth_form: update empty log tags.
Submitted by: trawick, covener, jailletc36, trawick, trawick, jailletc36, minfrin, minfrin, ylavic
Reviewed/backported by: jim


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See r1397602 on trunk

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reformat only (get rid of unnecessary block scope)

Clarify an existing requirement of the server_portstr parameter
to ap_proxy_determine_connection(): it must be a buffer of at
least one byte in size.

(And don't bother with using strcpy in order to zap a string.)

Submitted by: trawick
Reviewed/backported by: jim


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mod_cache: Preserve non-cacheable headers forwarded from an origin 304
           response. PR 55547.

When mod_cache asks for a revalidation of a stale entry and the origin responds
with a 304 (not that stale), the module strips the non-cacheable headers from
the origin response and merges the stale headers to update the cache.

The problem is that mod_cache won't forward the non-cacheable headers to the
client, for example if the 304 response contains both Set-Cookie and
'Cache-Control: no-cache="Set-Cookie"' headers, or CacheIgnoreHeaders is used.


mod_cache: follow up to r1591328.

Define the cache_merge_headers_out() function to merge r->err_headers_out into
r->headers_out and add the ones from r->content_type/encoding if available.
Use it in ap_cache_cacheable_headers_out() where the same is done and in
cache_save_filter() where this has to be done before updating the entry.


mod_cache: follow up to r1594643.

Avoid table lookup if not necessary (fast path first).

Submitted by: ylavic
Reviewed/backported by: jim


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mod_proxy_wstunnel: Fix the use of SSL connections with the "wss:" scheme.
                    PR55320.

Submitted by: Alex Liu <alex.leo.ca gmail.com>
Committed by: ylavic

Submitted by: ylavic
Reviewed/backported by: jim


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(simply copy from trunk except revision ref)


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(mod/mod_proxy_express.xml)
It does more than just a ProxyPass, but also looks at the HOST header,
so this gives somewhat deeper insight into what the end result looks
like.

(mod/mod_proxy_connect.xml)
a comma leaked onto the page

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#comment_2558

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fix typo -- comment 2561



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(simply copy from trunk except revision ref)


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  howto/index.xml:
    CGI is no longer the most common way to provide dynamic content, is it?
  howto/access.xml:
    Suggest the 'require expr' syntax as an alternate way to do something.
  caching.xml:
    elaborate on the early/late vs "Authorization" header (vs. other forms of 
    authorization)


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