What does request header too long mean?

Request Header or Cookie Too Large?" It’s an annoying problem typically caused by the Nginx web server, and it typically happens for one of two reasons. Sometimes the website using that software doesn’t allow browser cookies over a certain size, or cookies stored in your browser might be corrupted.

For More Information Please Refer: https://www.pcworld.com/article/3090464/when-browser-cookies-go-bad-how-to-avoid-bad-header-problems-on-favorite-websites.html