[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
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