Facebook = Content-Length: 0. PHP is awesome!

There’s really nothing other to say than: Content-Length: 0, dude.

$ curl -L -i -S -s "http://www.facebook.com/?ref=logo"
HTTP/1.1 302 Found
Location: http://www.facebook.com/common/browser.php
Content-Type: text/html; charset=utf-8
X-Cnection: close
Date: Thu, 11 Feb 2010 20:29:34 GMT
Content-Length: 0

HTTP/1.1 200 OK
Cache-Control: private, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Expires: Sat, 01 Jan 2000 00:00:00 GMT
P3P: CP="DSP LAW"
Pragma: no-cache
Set-Cookie: datr=1265920174-080002eb2a2e68060905a9e9803aac3446fe851c0fb77e4c2393a; expires=Sat, 11-Feb-2012 20:29:34 GMT; path=/; domain=.facebook.com
Set-Cookie: reg_fb_gate=http%3A%2F%2Fwww.facebook.com%2Fcommon%2Fbrowser.php; path=/; domain=.facebook.com
Set-Cookie: reg_fb_ref=http%3A%2F%2Fwww.facebook.com%2Fcommon%2Fbrowser.php; path=/; domain=.facebook.com
Content-Type: text/html; charset=utf-8
X-Cnection: close
Date: Thu, 11 Feb 2010 20:29:34 GMT
Content-Length: 0