400 bad request

[snacktime]

Well I figured out exactly what causes this after getting someone that had the errors to install the firefox livehttpheaders plugin.  It's the cookie size.  Cookie too large, nginx returns a 400 and doesn't log it.  Unfortunately there isn't much we can do about the cookie size.  With the fb connect iframe stuff there are other parties setting cookies on our domain.  

I tried in the past upping some buffers because I thought this might possibly be an issue, but it didn't help.  Maybe I set the wrong ones.  What specific setting can I use to allow large cookie headers? 

Below is a session of one of the requests causing the error:

GET /forums?facebook=1&token=56be59ba413134e28e2976e35545960c&user_id=8&app_name=mogul&fb_sig_in_iframe=1&fb_sig_locale=en_US&fb_sig_in_new_facebook=1&fb_sig_time=1244858147.2827&fb_sig_added=1&fb_sig_profile_update_time=1232413305&fb_sig_expires=0&fb_sig_user=542007204&fb_sig_session_key=deec04765ed50ee023ae5cf1-542007204&fb_sig_ext_perms=offline_access%2Cemail%2Cauto_publish_recent_activity&fb_sig_api_key=cf73a4d662d5ce97b44ec8a9f3121c9d&fb_sig_app_id=15420082636&fb_sig=b88fd355c67517fb5d67230415750609 HTTP/1.1
Host: facebook.offbeat-creations.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.11) Gecko/2009060215 Firefox/3.0.11
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
Referer: http://apps.facebook.com/beatycoon/wall/forums
Cookie: __utma=131917208.1556222345328091100.1244852730.1244856612.1244858119.3; __utmz=131917208.1244858119.3.3.utmcsr=apps.facebook.com|utmccn=(referral)|utmcmd=referral|utmcct=/beatycoon/; user_542007204=%5B%7B%22activities%22%3A%22%22%2C%22affiliations%22%3A%5B%7B%22nid%22%3A67108883%2C%22name%22%3A%22Seattle%2C%20WA%22%2C%22type%22%3A%22region%22%2C%22status%22%3A%22%22%2C%22year%22%3A0%7D%5D%2C%22birthday%22%3A%22December%2024%22%2C%22books%22%3A%22%22%2C%22current_location%22%3A%7B%22zip%22%3A%22%22%7D%2C%22education_history%22%3A%7B%7D%2C%22first_name%22%3A%22Chia%20Chin%22%2C%22interests%22%3A%22%22%2C%22meeting_for%22%3A%7B%7D%2C%22meeting_sex%22%3A%7B%7D%2C%22movies%22%3A%22%22%2C%22music%22%3A%22%22%2C%22name%22%3A%22Chia%20Chin%20Lee%22%2C%22pic%22%3A%22http%3A//profile.ak.facebook.com/profile5/772/114/s542007204_148.jpg%22%2C%22pic_small%22%3A%22http%3A//profile.ak.facebook.com/profile5/772/114/t542007204_148.jpg%22%2C%22relationship_status%22%3A%22Married%22%2!
 C%22religion%22%3A%22%22%2C%22sex%22%3A%22male%22%2C%22status%22%3A%7B%22message%22%3A%22%22%2C%22time%22%3A0%2C%22status_id%22%3A0%7D%2C%22tv%22%3A%22%22%2C%22uid%22%3A542007204%2C%22wall_count%22%3A305%2C%22work_history%22%3A%7B%7D%2C%22pic_square%22%3A%22http%3A//profile.ak.facebook.com/profile5/772/114/q542007204_148.jpg%22%7D%5D; gtl=131174; photos_542007204=%5B%7B%22subject%22%3A%22565010917%22%7D%2C%7B%22subject%22%3A%22603403123%22%7D%2C%7B%22subject%22%3A%22604053658%22%7D%2C%7B%22subject%22%3A%22636124705%22%7D%2C%7B%22subject%22%3A%22639286473%22%7D%2C%7B%22subject%22%3A%22644531360%22%7D%2C%7B%22subject%22%3A%22679766796%22%7D%2C%7B%22subject%22%3A%22700195562%22%7D%2C%7B%22subject%22%3A%22708288958%22%7D%2C%7B%22subject%22%3A%22708288958%22%7D%2C%7B%22subject%22%3A%22746248293%22%7D%2C%7B%22subject%22%3A%22746248293%22%7D%2C%7B%22subject%22%3A%22757564008%22%7D%2C%7B%22subject%22%3A%221165467950%22%7D%2C%7B%22subject%22%3A%221165467950%22%7D%2C%7B%22subject%22%!
 3A%221165467950%22%7D%2C%7B%22subject%22%3A%221182339204%22%7D!
 %2C%7B%2
2subject%22%3A%221223236240%22%7D%2C%7B%22subject%22%3A%221223236240%22%7D%2C%7B%22subject%22%3A%221223236240%22%7D%2C%7B%22subject%22%3A%221303717901%22%7D%2C%7B%22subject%22%3A%221303717901%22%7D%2C%7B%22subject%22%3A%221313378551%22%7D%2C%7B%22subject%22%3A%221313378551%22%7D%2C%7B%22subject%22%3A%221347486368%22%7D%2C%7B%22subject%22%3A%221347486368%22%7D%2C%7B%22subject%22%3A%221347486368%22%7D%2C%7B%22subject%22%3A%221444025780%22%7D%2C%7B%22subject%22%3A%221507201538%22%7D%2C%7B%22subject%22%3A%221536746061%22%7D%2C%7B%22subject%22%3A%221536746061%22%7D%2C%7B%22subject%22%3A%221536746061%22%7D%5D; __utmb=131917208.4.7.1244858119139; __utmc=131917208; mogul_game_session=BAh7DTogX3JmYWNlYm9va19mYnNlc3Npb25faG9sZGVydToiUkZhY2Vib29rOjpGYWNlYm9va1dlYlNlc3Npb24CFAEECHsPIhhAbGFzdF9lcnJvcl9tZXNzYWdlMCILQHF1aWV0RiIQQGFwaV9zZWNyZXQiJWRjM2E5OTAxZDVkNTYxOWRjOGMzYzllMGE5OTcxMjkyIg1AbmV0d29yayINZmFjZWJvb2siEUBzZXNzaW9uX2tleSInZGVlYzA0NzY1ZWQ1MGVlMDIzYWU1Y2YxLTU0MjAwNzIwNCIVQHNlc3Np!
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 2%3Atrue%7D; cf73a4d662d5ce97b44ec8a9f3121c9d=dca5f61a4d674f57!
 b6ce07e3
e1261045; cf73a4d662d5ce97b44ec8a9f3121c9d_user=542007204; cf73a4d662d5ce97b44ec8a9f3121c9d_ss=d867120f5c1cc5eac268e3cdae6c43cc; cf73a4d662d5ce97b44ec8a9f3121c9d_session_key=deec04765ed50ee023ae5cf1-542007204; cf73a4d662d5ce97b44ec8a9f3121c9d_expires=0

HTTP/1.x 400 Bad Request
Server: nginx/0.6.34
Date: Sat, 13 Jun 2009 01:55:53 GMT
Content-Type: text/html
Content-Length: 173
Connection: close

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,2757,2891#msg-2891