Sometimes when you visit a website, you may see a 400 bad request message. The first thing you should try is to refresh the webpage by pressing CTRL+F5. If that doesn’t help, you can do something else. But before that, let’s try to figure out why this is happening.

When you go to visit a webpage, if the server finds that the cookie size for that domain is too large or some cookies are corrupted, it will refuse to serve the webpage to you. Instead, in your browser window, it will show you 400 Bad request, request header or cookie too large or Big mistake. This is typical for nginx servers.

400 Bad request, request header or cookie too large

If you receive this error frequently, the best thing to do is to delete cookies for that particular domain. Let’s say if you receive this error when you visit a page on, for example, example.comthen you must delete all Cookies from from your browser’s cache.

While you can always use a tool like CCleaner to clear your entire cache, if you don’t want to do that, you’ll need to clear the cookie for that particular domain only.

These posts will show you how to do it:

  • Chrome, Chrome Edge and firefox can see this message – Clear cache and cookies for a specific website in
  • If you are a Internet Explorer user, see this article: Delete Temporary Internet Files and Cookies for a Specific Domain.
  • If you are a Microsoft Edge Legacy user, this browser does not allow you to delete the cache of particular websites. You will need to delete the entire browsing history and cache.
  • Want a handy tool? Use CookieSpy, a freeware that allows you to manage cookies from all browsers in one place.

As I mentioned before – If you don’t want to do this, you can also clear this browser’s entire cookie cache, through its settings or options. Note that by exercising this option, you will delete all your Cookies and therefore your settings as well as your identifiers.

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