Here are the headers I get back:
Date: Wed, 21 Dec 2011 19:40:08 GMT
Status: 200 OK
X-Transaction: d849eb9ba2b89634
ETag: "7346f04d31ae37daf42612d4d4dec3b5"
X-Frame-Options: SAMEORIGIN
Last-Modified: Wed, 21 Dec 2011 19:40:08 GMT
X-Runtime: 0.12137
Content-Type: text/html; charset=utf-8
Content-Length: 163
Pragma: no-cache
X-Revision: DEV
Expires: Tue, 31 Mar 1981 05:00:00 GMT
Cache-Control: no-cache, no-store, must-revalidate, pre-check=0, post-check=0
X-MID: 677e8f1f834f063956142da9c08d959300172d84
Set-Cookie: k=10.35.19.120.1324496408317801; path=/; expires=Wed, 28-Dec-11 19:40:08 GMT; domain=.twitter.com, guest_id=v1%3A132449640832492020; domain=.twitter.com; path=/; expires=Sat, 21-Dec-2013 07:40:08 GMT, original_referer=fBxhJyK4Ko2le28vCjFdUuU0TPqFAtRd5Sf5c5QBb4gTOUJXdRr%2B8fMpzo5i43qdtpdBso14k8sdRdYbr1UTTi5N7Q9mLoRp%2BlZcLoynFik%3D; path=/, external_referer=fBxhJyK4Ko2le28vCjFdUuU0TPqFAtRd5Sf5c5QBb4gTOUJXdRr%2B8fMpzo5i43qdtpdBso14k8sdRdYbr1UTTi5N7Q9mLoRp%2BlZcLoynFik%3D%7C0; path=/; expires=Thu, 22-Dec-2011 19:40:08 GMT
Vary: Accept-Encoding
Server: tfe