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Switch mod_ssl to use the ap_socache interface.

* modules/ssl/ssl_scache_shmcb.c, modules/ssl/ssl_scache_memcache.c,
  modules/ssl/ssl_scache_dc.c, modules/ssl/ssl_scache_dbm.c: Remove
  files.

* modules/ssl/mod_ssl.c (modssl_register_scache): Remove function.

* modules/ssl/ssl_private.h: Remove modssl_sesscache_provider etc.
  (SSLModConfigRec): Switch to using socache types.

* modules/ssl/ssl_engine_config.c (ssl_cmd_SSLSessionCache): Switch to
  use socache provider.

* modules/ssl/ssl_engine_mutex.c, modules/ssl/ssl_scache.c: Switch to
  using socache constants.

* modules/ssl/config.m4: Drop distache/memcache configuration, remove
  old objects.


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  Adjust the provider interface to use this instance type throughout.

* modules/cache/mod_socache_dbm.c,
  modules/cache/mod_socache_memcache.c,
  modules/cache/mod_socache_shmcb.c,
  modules/cache/mod_socache_dc.c: Adjust all implementations to 
  define the instance object in place of the "struct context", and
  to take this object directly in the provider interface.


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  Changes to mod_session.c only fix line endings again. No functional
  changes.


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Abstract out the mod_ssl session caching interface into a separate set
of modules, mod_socache_*.

* modules/cache/ap_socache.h: New file.

* modules/cache/config.m4: Copy CHECK_DISTCACHE from ../ssl/config.m4; 
  add new socache modules.

* modules/cache/mod_socache_dbm.c: Copied from ../ssl/ssl_scache_dbm.c.
  s/ssl_scache_/socache_/; add module structure and register_hooks.

* modules/cache/mod_socache_shmcb.c: Copied from ../ssl/ssl_scache_shmcb.c.
  s/ssl_scache_/socache_/; add module structure and register_hooks.
  Add SHMCB_MAX_SIZE definition, replacing APR_SHM_MAXSIZE.

* modules/cache/mod_socache_memcache.c: Copied from
  ../ssl/ssl_scache_memcache.c.
  s/ssl_scache_/socache_/; add module structure and register_hooks.
  Enable for APR-Util 1.3.x at compile-time, omitting configure-time
  checks.

* modules/cache/mod_socache_dc.c: Copied from ../ssl/ssl_scache_dc.c.
  s/ssl_scache_/socache_/; add module structure and register_hooks.


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  we are a reverse proxy request shutdown the connection WITHOUT ANY response
  to trigger a retry by the client if allowed (as for idempotent requests).
  BUT currently we should not do this if the request is the first request on
  a keepalive connection as browsers like seamonkey only display an empty page
  in this case and do not do a retry.

Related to PR 37770



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Reviewed by: Orhan Berent <berent belgeler.org>



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left for debugging purposes.


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* modules/ssl/ssl_engine_io.c (ssl_filter_io_shutdown): Remove
  redundant return value (which was always success).
  (ssl_io_filter_handshake): Return APR_ECONNABORTED on handshake
  failure, rather than success.
  (ssl_io_filter_output): Ignore ssl_filter_io_shutdown return
  value.


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* modules/ssl/ssl_engine_io.c: Define new error codes in the APR status
  code range, MODSSL_ERROR_BAD_GATEWAY and MODSSL_ERROR_HTTP_ON_HTTPS;
  use these HTTP_* constants directly as apr_status_t values.
  (ssl_io_filter_error): Use new constants.
  (ssl_io_filter_handshake): Return purely an APR status value rather
  than a mixture of HTTP_* constants, OpenSSL error codes, and APR
  status values.


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gcc -Wall.


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to determine if the MPM is trying to stop the process.


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the definition for the module type.


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This define serves no modern purpose, since every module in the wild, including 
our own define it, for no purpose.

If you have functions which you do not want in the 'public' API, put them
in a private header, that is not installed, just like mod_ssl does.


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