IT SEEMS THAT YOU MIGHT ALREADY BE FAMILIAR WITH
MY FAMOUS "BEST ANSWER" -- WHICH HAS SAVED 100s
OF YOUTUBERS SO FAR (no exaggeration).
IF YOU DID INDEED FOLLOW THE ADVICE THAT'S BELOW,
THEN I'M SHOCKED. PLEASE LOOK AT ALL THE RATINGS
AND COMMENTS GIVEN TO ME RECENTLY:
If "your browser sent a request that this server could not understand"
plus "Size of request header field exceeds server limit", that request
is a bad or oversized cookie. (The same thing is true for "Error 400").
For some very strange reason, it seems that
most Bad Request messages involve Firefox.
Simply delete your "Cookies" and everything
will be okay. Don't worry about erasing them;
nothing bad will happen. You won't lose your
internet browser's "Bookmarks" or "Favorites".
The worst thing that could happen is you will
be asked to retype your username/password
when you return to YouTube and some other
websites -- that's all.
Just as important, you should also delete all
your "Temporary Internet Files" and "History".
Those steps will make your computer totally
"fresh" in YouTube's eyes and make loading
and buffering faster. It would also be better if
you shutdown/reboot after doing this:
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
Internet Explorer 8:
→ Tools → Delete Browsing History
[. ] Preserve Favorites (leave blank)
[x] Temporary Internet files
[x] Cookies
[x] History
→ Delete
Mozilla Firefox 3:
→ Tools → Clear Private Data
[x] Browsing History
[x] Download History
[x] Saved Form and Search History
[x] Cache
[x] Cookies
→ Clear Private Data Now
Apple Safari 3:
→ Edit → Preferences
→ Security (tab) → Show Cookies
→ Remove All → Done
after that:
→ Safari → Empty Cache → Empty
after that:
→ History → Clear History
Google Chrome:
→ Tools (wrench) → Clear browsing data...
[x] Clear browsing history
[x] Clear download history
[x] Empty the cache
[x] Delete cookies
Clear data from this period: → Everything
→ Clear Browsing Data
◘ https://answersrip.com/question/index?qid=20081219100832AAisYVB
omg thank u thank u omg i looveee you ur the best u brought my youtube baakk!!! ----
i cant thnk u enough ---- god blessss uuu!!!!!! ----- lol thats how much i love youtube... ---- thnks!