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Microsoft Edge - Bad Request - Headers Too Long issue

Anonymous
2021-02-25T17:12:55+00:00

Starting last week or so, any time I go to Microsoft pages on Microsoft Edge, I get the following errors.

Page I am going to - https://support.microsoft.com/en-us/office/what-s-new-in-excel-for-microsoft-365-5fdb9208-ff33-45b6-9e08-1f5cdb3a6c73

Return error - Bad Request - Request Too Long - HTTP Error 400. The size of the request headers is too long.

So, for just these Microsoft pages, I have to open them in Chrome.  This is ridiculous.  What do I need to do to fix this?  I prefer Edge to Chrome because it seems to work better when using Office 365 web apps.

Thank you,

Rodger Benavides

Microsoft Edge | Website issues | Windows 10

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

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  1. Anonymous
    2021-02-25T20:37:11+00:00

    Bad Request - Request Too Long - HTTP Error 400. The size of the request headers is too long.

    This usually means that you have one or more cookies that have grown too big. Visit https://support.microsoft.com and - assuming the site opens normally - click on the padlock at the left-hand end of the address bar to open the site info pop-up. Click on Cookies to reveal all the cookies that the site has set (when I just did this, there were 140 of them). Then select each cookie folder in turn and click Remove.

    Restart the browser, then try visiting the URL you were having trouble with earlier. If you were signed in before, you'll probably have to sign in again.

    200+ people found this answer helpful.
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  1. Anonymous
    2021-02-27T00:53:41+00:00

    I mean, is my only resort to uninstall Edge and then reinstall it?

    The problem with that is that it won't remove the browser data. You have to get rid of the bad cookies if that is what's causing the problem.

    Click ⋯ (Settings and more) > Settings > Cookies and site permissions > Manage and delete cookies and site data > See all cookies and site data. Use the search box to find all the microsoft.com cookies and Remove all shown. Do the same for live.com. Then try visiting support.microsoft.com again.

    10+ people found this answer helpful.
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  2. Reza-Ameri 45,806 Reputation points Volunteer Moderator
    2021-02-25T17:25:45+00:00

    Does it work in the Chrome?

    Check and make sure your Microsoft Edge is fully updated.

    Try open the website using InPrivate browsing and see if the problem persist?

    8 people found this answer helpful.
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  3. Anonymous
    2021-02-26T21:34:48+00:00

    Yeah, so the support.microsoft.com site is giving me the same error. This is rather silly. I mean, is my only resort to uninstall Edge and then reinstall it?

    6 people found this answer helpful.
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  4. Anonymous
    2021-02-26T21:46:39+00:00

    All of the Microsoft links I frequent as a Trainer work in Chrome. I tried updating Edge, and then restarting the browser with no luck. I tried going to the link InPrivate, and it opened.

    I do not want to have to always go to Microsoft links InPrivate though. Any other suggestions? I appreciate your help.

    5 people found this answer helpful.
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