Merge r1756038 from trunk:

  *) mod_proxy_express: Fix possible use of DB handle after close.  PR 59230.

     [Petr <pgajdos suse.cz>]

  *) core/util_script: relax alphanumeric filter of enviroment variable names

  *) core/util_script: relax alphanumeric filter of environment variable names

     on Windows to allow '(' and ')' for passing PROGRAMFILES(X86) et.al.

     unadulterated in 64 bit versions of Windows. PR 46751.

     [John <john leineweb de>]

     fixes crash on a request that did not produce any response.

     [Stefan Eissing]

  *) mod_http2: trailers are sent after reponse body if set in request_rec

  *) mod_http2: trailers are sent after response body if set in request_rec

     trailers_out before the end-of-request bucket is sent through the 

     output filters. [Stefan Eissing]

     [Yann Ylavic]

  *) mod_proxy_connect/wstunnel: If both client and backend sides get readable

     at the same time, don't lose errors occuring while forwarding on the first

     at the same time, don't lose errors occurring while forwarding on the first

     side when none occurs next on the other side, and abort.  [Yann Ylavic]

  *) mod_rewrite: Improve relative substitutions in per-directory/htaccess

     the URL parameter interpolates to an empty string. PR 56603.

     [<ajprout hotmail.com>]

  *) core: Fix -D[efined] or <Define>[d] variables lifetime accross restarts. 

  *) core: Fix -D[efined] or <Define>[d] variables lifetime across restarts. 

     PR 57328.  [Armin Abfalterer <a.abfalterer gmail.com>, Yann Ylavic].

  *) mod_proxy: Preserve original request headers even if they differ

     instead of an explicit cn=* filter. [David Hawes <dhawes vt.edu>]

  *) ab: Add wait time, fix processing time, and output write errors only if

     they occured. [Christophe Jaillet]

     they occurred. [Christophe Jaillet]

  *) worker MPM: Don't forcibly kill worker threads if the child process is

     exiting gracefully.  [Oracle Corporation]

     [Chris Darroch]

  *) ab: Add a new -l parameter in order not to check the length of the responses.

     This can be usefull with dynamic pages.

     This can be useful with dynamic pages.

     PR9945, PR27888, PR42040 [<ccikrs1 cranbrook edu>]

  *) Suppress formatting of startup messages written to the console when

     request information to the request_rec structure. [Daniel Gruno]

  *) mod_lua: Add a server scope for Lua states, which creates a pool of

     states with managable minimum and maximum size. [Daniel Gruno]

     states with manageable minimum and maximum size. [Daniel Gruno]

  *) mod_lua: Add new directive, LuaMapHandler, for dynamically mapping

     URIs to Lua scripts and functions using regular expressions.

  *) mod_slotmem_shm: Fix mistaken reset of num_free for restored shm.

     [Jim Jagielski]

  *) mod_proxy: non-existance of byrequests is not an immediate error.

  *) mod_proxy: non-existence of byrequests is not an immediate error.

     [Jim Jagielski]

  *) mod_proxy_balancer: Improve output of balancer-manager (re: Drn,

     binary needs PCRE. [Rainer Jung]

  *) configure: tolerate dependency checking failures for modules if

     they have been enabled implicitely. [Rainer Jung]

     they have been enabled implicitly. [Rainer Jung]

  *) configure: Allow to specify module specific custom linker flags via

     the MOD_XXX_LDADD variables. [Rainer Jung]

     state after a timeout when discarding a request body. PR 51103.

     [Stefan Fritsch]

  *) core: Add various file existance test operators to ap_expr.

  *) core: Add various file existence test operators to ap_expr.

     [Stefan Fritsch]

  *) mod_proxy_express: New mass reverse-proxy switch extension for

  *) mod_mime_magic: Fix detection of compressed content. [Rainer Jung]

  *) mod_negotiation: Escape pathes of filenames in 406 responses to avoid

  *) mod_negotiation: Escape paths of filenames in 406 responses to avoid

     HTML injections and HTTP response splitting.  PR 46837.

     [Geoff Keating <geoffk apple.com>]

PATCHES ACCEPTED TO BACKPORT FROM TRUNK:

  [ start all new proposals below, under PATCHES PROPOSED. ]

  *) Typo fixes in comments and text files. PR 59990.

      Trunk version of patch:

         http://svn.apache.org/r1756038

      Backport version for 2.4.x of patch:

         http://home.apache.org/~rjung/patches/httpd-2.4.x-typo-PR59990.patch

         (trunk version of patch merge plus CHANGES plus STATUS

          plus one hunk in modules/aaa/mod_auth_digest.c)

      +1: rjung, ylavic, jchampion

      jchampion: IMO, spell-checking STATUS is probably unnecessary.

  *) mod_proxy_fcgi: read the whole FCGI response even when the content has

     not been modified (HTTP 304) to avoid subsequent bogus reads and

     confusing error messages logged.

     +1: jkaluza

     +1: covener w/ doc or code to fix syntax (providername:providerarg not supported like syslog or socacheproviders, 

                 needs 2 args which is not valid in ErrorLog manual)

     trawick: nit: fix "writing" in "/* NULL if we are writting to syslog */"

     trawick: nit: fix "writing" in "/* NULL if we are writing to syslog */"

              (sorry, haven't finished reviewing completely)

     jim: What is the status of this??

     +1: jkaluza

  * mod_proxy: Ensure network errors detected by the proxy are returned as

    504 Gateway Timout as opposed to 502 Bad Gateway

    504 Gateway Timeout as opposed to 502 Bad Gateway

    trunk patch: https://svn.apache.org/viewvc?view=revision&revision=1480058

    2.4.x patch: trunk patch works modulo CHANGES

    +1:

          of described indirectly in a sample?

          Why are these new samples added to the install without three

          votes?  (I didn't veto it; put your name next to the two

          existing ones and I'll be satisified that enough people

          existing ones and I'll be satisfied that enough people

          considered this addition as an appropriate solution for a

          real httpd usability problem.)

     wrowe: I'd agree with trawick, and suggest that these scripts can begin

    RAW_ARGS,           /**< cmd_func parses command line itself */

    TAKE1,              /**< one argument only */

    TAKE2,              /**< two arguments only */

    ITERATE,            /**< one argument, occuring multiple times

    ITERATE,            /**< one argument, occurring multiple times

                         * (e.g., IndexIgnore)

                         */

    ITERATE2,           /**< two arguments, 2nd occurs multiple times

/**

 * Detach from open ap_configfile_t, calling the close handler

 * @param cfp The file to close

 * @return 1 on sucess, 0 on failure

 * @return 1 on success, 0 on failure

 */

AP_DECLARE(int) ap_cfg_closefile(ap_configfile_t *cfp);

 * Constant to store module_index for the current file.

 * Objects with static storage duration are set to NULL if not

 * initialized explicitly. This means that if aplog_module_index

 * is not initalized using the ::APLOG_USE_MODULE or the

 * is not initialized using the ::APLOG_USE_MODULE or the

 * ::AP_DECLARE_MODULE macro, we can safely fall back to

 * use ::APLOG_NO_MODULE. This variable will usually be optimized away.

 */

 * Determine whether access control hooks will be run for all internal

 * requests with URIs distinct from that of the initial request, or only

 * those for which different configurations apply than those which applied

 * to the initial request.  To accomodate legacy external modules which

 * to the initial request.  To accommodate legacy external modules which

 * may expect access control hooks to be run for all internal requests

 * with distinct URIs, this is the default behaviour unless all access

 * control hooks and authentication and authorization providers are