Add support for distributed caching of SSL Sessions inside memcached, using apr_memcache, which is present in APR-Util 1.3/trunk.

This was originally written at ApacheCon US 2005 (San Diego), and was sent to the list:
http://mail-archives.apache.org/mod_mbox/httpd-dev/200512.mbox/%3C439C6C07.9030904@force-elite.com%3E

This version is slightly cleaned up, and of course, uses the now bundled apr_memcache, rather than an external dependency.



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  configuration in the scoreboard and not with the ones loaded from the
  configuration files.


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mod_mem_cache: Copy headers into longer lived storage; header names and
values could previously point to cleaned up storage

PR: 41551
Submitted by: Davi Arnaut <davi haxent.com.br>
Reviewed by: covener



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  accordingly if ret is HTTP_NOT_MODIFIED as this breaks mod_cache validating a
  stale entity.


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  for our later call to ap_meets_conditions a few lines above. Having it put
  in the merge table will fail as merge and r->err_headers_out get merged
  AFTER our call to ap_meets_conditions. Besides of this having multiple
  ETag headers (or a merged version of them) does not seem to make sense.


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We've just had another duplicate report of this on bugzilla.
We've got a simple patch, and people asking WTF is going on
with inaction.  Noone seems clear on why the patch shouldn't
be applied (http://marc.info/?l=apache-httpd-dev&m=117760311129386&w=2).


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frequently-asked (IRC) question that came up yet again today.


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Submitted by Vincent Bray noodlet at gmail dot com, 
edited and reviewed by sctemme


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don't actually have a driver-specific value to pass to apr_dbd_error(),
but that's OK because most/all drivers just ignore this value anyway


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response or are invalid.


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* modules/cache/mod_cache.c
  (cache_save_filter): Properly handle HEAD responses when we have a stale handle.

(This patch was revised by Justin/Ruediger.)

Submitted by: Niklas Edmundsson
Reviewed by: Justin, Ruediger


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representation if Expires is not set.

* modules/cache/mod_cache.c
  (cache_save_filter): If Cache-Control max-age is set and Expires isn't,
  let that value control our expiration.


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freshness tests which will attempt to revalidate the content.

* modules/cache/mod_disk_cache.c
  (open_entity): If the root Vary index is stale, we don't need to throw away
  potentially stale content - we can try to refresh it.


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let us later throw away the renegotiated content due to a name mismatch.

We do not need to update the ->name field just before writing the headers as
the computed ->name on open and create is sufficient.  Updating ->name here is
essentially a no-op - except in the case of Vary where the key has internally
changed (to account for the Vary prefix), but the original name has not.
However, writing the Vary'd-accounted key means that when we read the cache
next that we will error out and disregard the just renegotiated response and
fetch the content all over again - oops!

(This is largely a case where I think we may have overthought ourselves; hence
the explanation is here in the commit rather than in the file itself.)

* modules/cache/mod_disk_cache.c
  (store_headers): The originally opened ->name is sufficient.
* CHANGES: Combined with r538992, note that renegotiation for Vary's seem to
  work far better.


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the refreshed .vary structure in the right directory.  Otherwise, we'll create
a new .vary layout underneath the already existing one - oops!

* modules/cache/mod_disk_cache.c
  (store_headers): Temporarily clear dobj->prefix if it is set to ensure that
  we create the .vary structure underneath the cache root.


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so per Sec. 13.9 permit queries with just max-age instead of only Expires.

* modules/cache/mod_cache.c
  (cache_save_filter): Be closer to RFC 2616's intent for query arguments.
* CHANGES: Update.


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full regex substitution but also allow for "simple"
cases (ala JkMount) to work as well.



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for example:

   ProxyPass ~ \.gif balancer://imagecluster




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Think this can be safely backported to 2.2 and 2.0 branches

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  brigade in the case that a non blocking read from the socket returned
  APR_EAGAIN. So getting an empty brigade also shows that no data is present
  in the input filter.
  While this reduces the number of false positives for "real data" in the input
  filter the behaviour is not as good as before 533820 because if there are
  only CRLF's in the input filter we do not flush, but we should. To fix this
  it seems that a simulation of AP_MODE_EATCRLF is needed inside of
  check_pipeline.
- Destroy brigade bb at the end of the function.


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  s-maxage, max-age, min-fresh, max-stale has no value assigned.
  In this case ignore s-maxage, max-age, min-fresh. For max-stale
  it is valid to set no value. In this case set max-stale to 1 year
  to signal that the client is accepting a stale response of any age.

Submitted by: Niklas Edmundsson <nikke acc.umu.se>
Reviewed by: rpluem


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aware of problems with other input filters that aren't addressed in that fix.


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actually update APR and apr_socket_recvfrom()
to know about APR_MSG_OOB, APR_MSG_PEEK, etc...
this code won't need to be adjusted. Also,
make nicer for 2.2 backport.



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of the old support.xml and a pointer to the wiki.

Of possible interest: I've also removed the link to the professional support
database, since it was returning error 500 for some time and nobody
seemed to care.


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  them in C++ code.

PR: 42286
Submitted by: Davi Arnaut <davi haxent.com.br>
Reviewed by: rpluem


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Submitted by: Takashi Sato
Reviewed by: Hiroaki Kawai


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re-introduce ap_satisfies API back into core and modify how the access_checker, check_user_id and auth_checker hooks are called so that they respect the precedence that is set through the satisfy ALL/ANY directive. This also restores the directives order, allow, deny, satisfyas supported directives rather than being deprecated.  These directives still remain in mod_access_compat however.

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to accomodate mod_ssl's input filter.  AP_MODE_EATCRLF is essentially a no-op
in that filter.

this fixes missing imbedded graphics etc when using the Event MPM with mod_ssl
with HTTP pipelining enabled in the browser.  the pipelined requests after the
first were never read from mod_ssl's input filter.  it might reduce unneeded 
flushes with other MPMs.


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Submitted by: Takashi Sato
Reviewed by: Hiroaki Kawai


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