Source Viewer

I was surfing on my phone and a page showed XML parsing failed. I wanted to check what's wrong with the BSE site. Just googled for an online source viewer, found a few which didn't appeal to me so I decided to write my own and under two minutes I built my own source viewer and uploaded on my PHP capable server. Here's the darn few line code:

<?php
header("Content-type: text/plain");
$page=$_GET["url"];
$fp = fopen($page, r);
while (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);
?>