Nginx return Error 400 on long cookies,

[escavern]

i tried to install google friend connect on my forum, and i can't get it
worked.
when i checked with firebug, it shows:

 ""NetworkError: 400 Bad Request -
http://mc8tdi0ripmbpds25eboaupdulritrp6-a-fc-opensocial.googleusercontent.com/ps/ifr?container=friendconnect&mid=0&nocache=0&view=profile&parent=http%3A%2F%2Fwww.ceriwis.us%2Fhanyates%2Fvbnexus%2Fgoogle%2F&url=http%3A%2F%2Fwww.google.com%2Ffriendconnect%2Fgadgets%2Fosapi-0.8.xml&communityId=11096874856524462449&caller=http%3A%2F%2Fwww.ceriwis.us%2Fhanyates%2Findex.php&rpctoken=273046583""

but when i installed the plugin on apache it works.. anybody knows what
is the problem above ?
im googling it and find "http://forum.nginx.org/read.php?2,61022,61178"

and i've added "large_client_header_buffers 4 8k;"  to the config files
but it still show the same error..

maybe people here knows what really happen and how to solve it. 
any help will be appreciated. Thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,220475,220475#msg-220475