mod_socache_shmcb: Correct counting of expirations for status display.
Expirations happening during retrieval were not counted.

Submitted by: rjung
Reviewed/backported by: jim


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mod_cache: Retry unconditional request with the full URL (including the
           query-string) when the origin server's 304 response does not
           match the conditions used to revalidate the stale entry.

http://www.mail-archive.com/dev@httpd.apache.org/msg59884.html

Submitted by: ylavic
Reviewed/backported by: jim


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mod_cache: Don't add cached/revalidated entity headers to a 304 response.
           PR 55547.

When the conditional request meets the conditions of the stale then revalidated
entry, the forwarded 304 response includes the entity headers merged from the
cached headers (before updating the entry).
Strip them before returning a 304.

Since the entity headers are stripped elsewhere, factorize the code using a
new table (MOD_CACHE_ENTITY_HEADERS[]) containing these headers's names.


mod_cache: follow up to r1591320.

Use the new MOD_CACHE_ENTITY_HEADERS[] names to check 304 contradictions
against the same headers.


mod_cache: follow up to r1591322

Avoid one unnecessary test when checking 304 contradictions.


mod_cache: follow up to r1591390

Fix code typo.

Submitted by: ylavic
Reviewed/backported by: jim


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trunk commits:
	r1491180
	r1563894, r1566428, r1566449

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Introduced in r1132494
   CONTEXT_PREFIX
   CONTEXT_DOCUMENT_ROOT
and since the beginning of util_expr_eval.c  for
   HTTP_COOKIE

Description still missing.

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mod_alias: Stop setting CONTEXT_PREFIX and CONTEXT_DOCUMENT environment
variables as a result of AliasMatch.

Submitted by: covener
Reviewed by: jim, ylavic


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mod_authn_socache: fix logging of bogus rv in r1576233

Submitted by: trawick
Reviewed by: jim, ylavic


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mod_proxy_fcgi: remove wasted memset() calls and other historical bits

Submitted by: trawick
Reviewed by: jim, ylavic


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Add missing Server-Variables useable in RewriteCond directive.
Introduced in r1132494
   CONTEXT_PREFIX
   CONTEXT_DOCUMENT_ROOT
Introduced in r737973
   IPV6
Missing for ages!
   SCRIPT_GROUP
   SCRIPT_USER

I have added where I found it logical, feel free to adjust.
I have also reordered this table to ease reading.
Finally, I have beautified some tables at the end.

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Remove useless link.

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- Fix extra ] spotted in online doc by emigas.
- Remove another ] introduced in Hearder syntax in r1588244
- s/variable/varname/ to match the text below it.
- Turn the syntax of both Header and RequestHeader to be:
   header [value [replacement [early|env=[!]variable|expr=expression]]] 
in order to match the code.
This removes the ambiguity of expr=<something> which can now be used in 2 different places in the syntax.
- Also remove the space in 'expr= value' in compatibility note, to help distinguish between the two

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