[Wordpress] Size of a request header field exceeds server limit.
[Wordpress] Size of a request header field exceeds server limit.
This error is browser specific "Size of a request header field exceeds server limit." please check by clearing the cache and cookies of your browser or check via Incognito / Private mode this error has been reported on the WP forums too and thats the only solution. https://wordpress.org/support/topic/400-bad-request-header-field-cookies