Twitter Atom feeds are API results

gistfile1.txt

$ curl -I https://twitter.com/statuses/user_timeline.atom?screen_name=markpasc
HTTP/1.1 200 OK
Date: Thu, 06 Sep 2012 03:17:59 GMT
Status: 200 OK
X-MID: 883d8e4575e5f12f60e1383bf38888728c981d7f
Content-Type: application/atom+xml; charset=utf-8
ETag: "1cd2a359db6ce15fc5e1c536b404d721"
Expires: Tue, 31 Mar 1981 05:00:00 GMT
Cache-Control: no-cache, no-store, must-revalidate, pre-check=0, post-check=0
X-RateLimit-Reset: 1346902028
X-RateLimit-Class: api
X-Transaction-Mask: a6183ffa5f8ca943ff1b53b5644ef114f784bf3d
X-RateLimit-Remaining: 146
Strict-Transport-Security: max-age=631138519
Pragma: no-cache
Content-Length: 19186
X-Runtime: 0.06840
X-Transaction: f98b7431ee7aca86
Last-Modified: Thu, 06 Sep 2012 03:17:59 GMT
X-RateLimit-Limit: 150
X-Frame-Options: SAMEORIGIN
Set-Cookie: k=10.34.124.113.1346901479542443; path=/; expires=Thu, 13-Sep-12 03:17:59 GMT; domain=.twitter.com
Set-Cookie: guest_id=v1%3A134690147962350465; domain=.twitter.com; path=/; expires=Sat, 06-Sep-2014 15:17:59 GMT
Set-Cookie: _twitter_sess=BAh7CDoPY3JlYXRlZF9hdGwrCMmQlZk5AToHaWQiJWE0YTNkY2ZjMTQyNTli%250AZGY3YzQ2YzM5NWNhMGQ1MzI0IgpmbGFzaElDOidBY3Rpb25Db250cm9sbGVy%250AOjpGbGFzaDo6Rmxhc2hIYXNoewAGOgpAdXNlZHsA--2d0923f730527b190dff3611f367be3fa02852d7; domain=.twitter.com; path=/; HttpOnly
Vary: Accept-Encoding
X-XSS-Protection: 1; mode=block
Server: tfe