youtube 400 Bad Request wtf?

For some very odd reason, it seems that 9 out

of 10 error messages like this deal with Firefox.

If "Your browser sent a request that this server

could not understand", plus "Size of a request

header field exceeds server limit", that strange

request may be a bad or unusually big cookie.

(The same thing is true for "Error 400" codes.)

Simply clear all of your cookies and everything

should be fine. Don't worry about getting rid of

them; absolutely nothing bad will happen. You

won’t lose your internet browser's "Bookmarks"

or "Favorites". The worst-case scenario is that

you will have to type your username/password

again when you first revisit YouTube and a few

other websites -- that's all.

While you're erasing your cookies, you should

also be deleting your "temporary internet files"

and "history" to get them out of your computer

memory, and make everything fresh. After that,

it's best if you shutdown and then reboot:

Internet Explorer 6:

→ Tools → Internet Options

→ Delete Cookies → OK

→ Delete Files → OK

→ Clear History → Yes

→ OK

Internet Explorer 7:

→ Tools → Internet Options → Delete...

→ Delete files → Yes

→ Delete cookies → OK

→ Delete history → OK

→ Close (browsing history window)

→ OK

Mozilla Firefox

→ Tools → Clear Private Data

[x] Browsing History

[x] Download History

[x] Saved Form and Search History

[x] Cache

[x] Cookies

→ Clear Private Data Now

http://youtube-answers.blogspot.com/2008/11/what-i...