“Bad request Error 400” for GMail on Firefox


For the last 2-3 days I had an unusual situation to deal with. Whenever I tried to visit my GMail account using Firefox, the response was:

Bad request
Error 400

 At first I checked with the other browsers (Chrome, Opera and Midori) I have installed on my system. All connected without reporting anything.
Then, my next guess was misbehaving addons, but as I tweeted:

So, what is wrong with #GMail on #Firefox today? “Bad request Error 400” (even with all addons disabled)
— A. P. Tsompanopoulos (@aptlogs) March 22, 2012

Since that approach didn’t helped either, I decided to remove the GMail-related cookies. I used the “Remove cookie(s) for Site” addon and it deleted 78 cookies I had for GMail.

Unfortunately, I don’t know which cookie was the “bad” one, but after deleting them I was again able to reconnect without problem.

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5 Replies to ““Bad request Error 400” for GMail on Firefox”

  1. This happens every few months / weeks for me. My personal mail is on Gmail. My work mail is on gmail. Let's say, once a quarter, I have to wipe all my gmail cookies because of this problem.

  2. I think this "cookie" problem is related to the number of GMail-connected accounts one has activated. I've found that if this number is 8, then there is problem; if it's 4, then everything is OK.

  3. Its strange but, very soon I am into the same situation.
    Drafts>Search for contact in mails, and try to get back to Drafts!
    Error #400..

    Can anyone explain?

  4. I just used Clear Cookies+Cache & Offline Website Data for the last hour…it helped!

    I wonder.,I was normally using my mail.
    Was typing in an email, needed to check for a recepient, so went to search for it. And when I found it, I tried to get back to Drafts, but it gave #400 :

    I hope it doesn't happens again!

  5. first time ever it is happening with me 🙁

    I do have MANY accounts..but its been YEARS now!

    I wonder what and why :

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