为什么header（）; 是不是发送http referrer？

My streaming content is on another web server ex: stream.mysite.com. On stream.mysite.com, I configured IIS rewrite rules so when I try stream.mysite.com/video.mp4 it is going to a blank page and when I put a link on my site it starts downloading. But i need it to work like this:

<?php

$url = $_GET['u'];
header("Location: $url");
die();

?>

mysite.com/go.php?u=stream.mysite.com/video.mp4 doesn't work.

Sorry English is not my first language, I hope I have made myself clear.

try like this.I hope this will help you

<?php
   echo ("<SCRIPT LANGUAGE='JavaScript'>
   window.location.href='url';
   </SCRIPT>");
 ?>

If you want to use HTTP_REFERER to your header, just fix that code.

<?php

$url = $_SERVER['HTTP_REFERER'];
header("Location: $url");
die();

?>