[Httpd Wiki] Update of "RewriteMisc" by RichBowen

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The "RewriteMisc" page has been changed by RichBowen.
http://wiki.apache.org/httpd/RewriteMisc?action=diff&rev1=2&rev2=3

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  RewriteRule ^/(.+\.php)$ balancer://myphpcluster/$1 [P] maxattempts=2
  }}}
  
+ = Log executable file access =
+ 
+ We wish to create a log file that logs accesses to executable files, wherever they are in the filesystem, and whatever file extension they have.
+ 
+ {{{
+ RewriteCond %{LA-U:REQUEST_FILENAME} -x
+ RewriteRule ^ - [E=exec:1]
+ CustomLog /var/logs/exec-cgi.log combined env=exec
+ }}}
+ 
+ == Discussion ==
+ 
+ The LA-U syntax does a look-ahead to find out what the value of a particular variable will be later on. This requires a sub-request, and that results in something of a performance hit. Consider using the ScriptLog directive instead. However, the technique used here can be used for a larger class of problems, when a variable isn't available at request time, but will be later on.
+ 
+ }}}
+