title: Understanding apache RewriteLog
body: <p>I'd like to understand the output from RewriteLog in apache2.
  I have something like </p>
  
  <p>...... (3) applying pattern '^/img(.*)' to uri '/api/marker/2'<br>
  ...... (3) applying pattern '^/img/imagecache/(.+)' to uri '/api/marker/2'                                                                            .....  (1) pass through /api/marker/2<br>
  .... . (3) [perdir /some/path] add path info postfix: /some/path/marker -> /some/path/marker/2<br>
  .......(3) [perdir /some/path] strip per-dir prefix: /some/path/marker/2 -> marker/2</p>
  
  <p>Those things in brackets (Example (1),(2) etc...,      the key phrases   "pass through" "applying pattern" "perdir"  prefix/postfix etc.
  I don't see nothing in manual regarding this.</p>