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Allow AP_SERVER_ADD_STRING to be more "easily" changed


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Further clarify the naming of the entity that originates the request by
calling that entity a useragent instead of a client.
Further clarify the naming of the entity that directly connects to us by
calling that entity a client instead of a peer.


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Explicitly cast function pointer, to remove 'const'.
Hopefully this makes the NetWare compiler happy.


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mod_slotmem_shm: Remove the colon syntax to indicate a relative path, and
make the relative path default behaviour. Remove the word "anonymous" as
a filename for special treatment, what used to be "anonymous" is now "none".

Submitted by: minfrin
Reviewed/backported by: jim


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logging adjustments:
- consistently call ssl_log_ssl_error after ap_log_error etc.
- ssl_init_ConfigureServer: add vhost_id to log message


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Streamline TLS session ticket key handling (added in r1200040):
- drop the SSLTicketKeyDefault directive, and only support a single
  ticket key per server/vhost
- rename the SSLTicketKeyFile directive to SSLSessionTicketKeyFile,
  remove the keyname parameter
- move ticket key parameters from SSLSrvConfigRec to modssl_ctx_t
- configure the tlsext_ticket_key_cb only when in server mode
- add documentation for SSLSessionTicketKeyFile


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Limit length of lines in .htaccess to 8K again, to reduce DoS potential.
Make ap_varbuf_cfg_getline() strictly enforce the max_len parameter.


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Fix names of unary operators like '-s' being compared case insensitively.
Improve error message if op or function is not found. Document '-s' operator.


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Various fixes for log message tags:

- Remove tags in ssl_log_ssl_error() and ssl_log_cert_error()
- Instead add tags to various ssl_log_xerror, ssl_log_cxerror
  calls (ssl_log_rxerror is unused).
- likewise for modssl_proxy_info_log()

- Fix spelling of APLOG_NOERRNO in coccinelle script
- add support for ssl_log_*error and ap_log_cserror

- add some more tags missing due to APLOG_NOERRNO spelling error

- Remove tags from example modules (we don't want people to blindly copy
  those)



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Remove usage of APLOG_NOERRNO. It has been a no-op since at least 2.0.x


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Remove unused variable



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Adjust the OpenSSL session id context for SNI configurations, so that
sessions are tied to the proper vhost (subset of a patch I originally
proposed in November 2009, cf. message with ID <4AF85A18.1000205@velox.ch>).


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Create initial documentation for mod_socache_shmcb, mod_socache_dc,
mod_socache_dbm and mod_socache_memcache.


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Create mod_cache.imp dynamically; fixed mod_cache_disk NLM name.


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mod_cache: Remove dead code from the legacy mod_mem_cache module.


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Overhaul the caching guide in an effort to clearly distinguish between
the mod_cache caching, the socache caching, and other caching we do, such
as mod_file_cache.


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Fix a few compiler warning reported by Steffen:
- some signed/unsigned mismatches
- const for a function does not make sense


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Add lots of unique tags to error log messages

ssl_util.c: Downgrade some dynamic locking messages from level DEBUG
to TRACE1-3


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Change the provider names to match the module names:
mod_slotmem_shm: shared -> shm
mod_socache_memcache: mc -> memcache


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More pointers to mod_socache*


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per module as the proxy_function instead of
the macro __FUNCTION__ which is not C89.

There's no real loss of information, because all
of the calls are in the same scgi handler function.

All proxy modules apart form SCGI already use the
upper case scheme in the analogous calls.

Backport of r1210124 from trunk.


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