Description:
------------
When form with POST method contains text field and fill it with $_GET or $_SESSION , $_POST, ...
the page in action redirect to 403 page error:


Test script:
---------------
<form method="post" action="<?php $_SERVER['PHP_SELF'] ?>">
   <input type="text" name="something">
   <input type="submit" name="send" value="send">
</form>

<?php

$method = $_SERVER['REQUEST_METHOD'];
echo $method;



Expected result:
----------------
POST

Actual result:
--------------
Forbidden

You don't have permission to access /req.php on this server.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.