Comment 1 for bug 1939678

mybe i thought with a newer apache the problem is solved but with no luck.

LB Manager VM dist-upgrade 21.04 / hirsute

:~# vim /etc/update-manager/release-upgrades
[...]
#Prompt=lts
Prompt=normal

:~# do-release-upgrade
:~# shutdown -r now

:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 21.04
Release: 21.04
Codename: hirsute

:~# dpkg -l | grep apache2
ii apache2 2.4.46-4ubuntu1.1 amd64 Apache HTTP Server
ii apache2-bin 2.4.46-4ubuntu1.1 amd64 Apache HTTP Server (modules and other binary files)
ii apache2-data 2.4.46-4ubuntu1.1 all Apache HTTP Server (common files)
ii apache2-utils 2.4.46-4ubuntu1.1 amd64 Apache HTTP Server (utility programs for web servers)

Browser: Firefox and Chrome

http://192.168.56.90/test-web01/balancer-manager

:~# tail -f /var/log/apache2/management_error.log
[Fri Aug 13 16:56:31.818801 2021] [proxy_balancer:error] [pid 717:tid 140627126277696] [client 192.168.56.90:44938] AH10187: ignoring params in balancer-manager cross-site access
[Fri Aug 13 16:56:34.088176 2021] [proxy_balancer:error] [pid 717:tid 140627117884992] [client 192.168.56.90:44938] AH10187: ignoring params in balancer-manager cross-site access, referer: http://192.168.56.90/test-web01/balancer-manager
[Fri Aug 13 16:56:34.663154 2021] [proxy_balancer:error] [pid 717:tid 140627109492288] [client 192.168.56.90:44938] AH10187: ignoring params in balancer-manager cross-site access, referer: http://192.168.56.90/test-web01/balancer-manager?b=test&w=http://192.168.168.130/test&nonce=936feca7-14cd-c118-d222-c6b172c9729e