Sometimes when you tried to access a site, and you happen to get this error message:
Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.
HOW TO FIX:
1. Click TOOLS -> OPTIONS
2. Go to PRIVACY -> click REMOVE INDIVIDUAL COOKIES
3. Type the url of the site where you saw the 400 Bad Request message:
4. It’ll show you all the cookies you have for that site, now click REMOVE COOKIE.