title: Modify POST request in mod_perl2
body: <p>Does anyone know how to access/modify the POST request data using mod_perl2.
  IN GET method one can get/set the request QUERY string:</p>
  
  <pre><code>  $args      = $r-&gt;args();
    $prev_args = $r-&gt;args($new_args);
  </code></pre>
  
  <p>How to get/set the request QUERY string in POST method ?</p>