Fixing “Size of a request header field exceeds server limit.” error

This error from Apache is typically caused by a very large cookie. In Apache the “LimitRequestFieldSize” directive sets this limit. The default is 8190 bytes. To change the file create a file at:

/etc/httpd/conf.d/custom.conf

or

/etc/apache2/conf.d/custom.conf

containing the desired change:

Reload Apache after adding the file with:

/sbin/service apache2 restart

or

/sbin/service httpd restart