Issue How to fix 400 Bad Request - Size of a request header field exceeds server limit

[Organizer]

Version 18.0.27 Update #1 / Ubuntu 18.04.5 LTS

I have been running RSS server scripts for some time without issues. I often have a page or two up relating to the script that I come back to and can refresh just fine. however lately when go back to such an open open tab in Chrome and refresh I get this error:

Bad Request​

Your browser sent a request that this server could not understand.
Size of a request header field exceeds server limit.
Apache Server at default-x_x_x_x Port 443

After some searching I updated the domains Apache & nginx Settings and Additional directives for HTTP + for HTTPS:
LimitRequestLine 16380
LimitRequestFieldSize 16380

However this did not resolve the issue, so I am now rather confused on the next steps. I can sometimes bypass the issue by simply visiting the Plesk logon page and then go back to refresh strange enough. Anyone got some tips?

Chris

 

[IgorG]

Please apply the steps below to troubleshoot the issue:

1. Backup the Apache configuration file:

# cp -a /etc/apache2/apache2.conf /root/apache2.conf.backup

2. Add the following line to the Apache configuration file:

LimitRequestFieldSize 16000

3. Restart apache2 service with the command:

# systemctl restart apache2

In case the issue persists, please double the value from 16000 to 32000 and restart apache2 service.

 

[Organizer]

Thanks will try it out: might takes a day or more to see if it works though as the error is far apart. That aside, is this not what those Additional directives are supposed to do? I was thinking to go up to 32000, it might of course be that the error consisted due to 16k also not being enough in my case.

 

[IgorG]

My suggestion is server-wide, but in Additional directives you apply settings only for one domain.