asp400页面 

<%Response.Status="400 Bad Request"%>

 <h1>Bad Request (Invalid Hostname)</h1>

php400页面

<?php   header("HTTP/1.1 400 Bad Request");   ?>   

<h1>Bad Request (Invalid Hostname)</h1>

jsp400页面

<%     // Set error code and reason.     response.sendError(400, "Need authentication!!!" );