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My school uses Ironport for filtering/monitoring web traffic. I have a bit of curiosity as to why it tacks on a x-junk: header onto everything. After going through a few curl tests, I've found no real connection between what is shown on the page and the x-junk: header.

here's my curl request: any ideas?

Anchorage:~ khotchkiss$ curl -I
HTTP/1.1 301 Moved Permanently
Content-Type: text/html; charset=UTF-8
Date: Sun, 06 Feb 2011 04:37:25 GMT
Expires: Tue, 08 Mar 2011 04:37:25 GMT
Cache-Control: public, max-age=2592000
Server: gws
X-XSS-Protection: 1; mode=block
Content-Length: 219
Age: 108
Connection: keep-alive
X-Junk: xxxxxxxxxxxxxxxxxxxxxxx
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