What does 400 request header or cookie too large mean?

400 Bad Request, Cookie Too Large message in Chrome, IE, Firefox, Edge. … When you go to visit a web page, if the server finds that the size of the Cookie for that domain is too large or that some Cookie is corrupted, it will refuse to serve you the web page.

For More Information Please Refer: https://www.thewindowsclub.com/400-bad-request