Apache Reverse Proxy based on subdomain - regex

Question

I am currently trying to set up Apache2 as reverse proxy rewriting based on a subdomain's hostname.
Any request sent to *.accepted-terms.mydomain.tld should be forwarded to a local port using the Host *.mydomain.tld. Simply, the .accepted-terms in the middle should be cut away.
Eg
foo.accepted-terms.mydomain.tld → foo.mydomain.tld:6443
bar.accepted-terms.mydomain.tld → bar.mydomain.tld:6443
<VirtualHost *:443>
SSLEngine on
[...] # SSL Certificates
SSLProxyEngine On
ProxyPreserveHost On
ServerName accepted-terms.mydomain.tld
ServerAlias *.accepted-terms.mydomain.tld
ProxyPass / https://0.0.0.0:6443/
ProxyPassReverse / https://0.0.0.0:6443/
#-------- Here, the fun starts:
SetEnvIf Host ^(.*)accepted-terms\.mydomain\.tld$ new_host=$1
RequestHeader set Host %{new_host}emydomain.tld
#------- Here, the fun should be done.
RequestHeader set Cookie "disclaimer_accepted=true"
</VirtualHost>
Unfortunately, my tries based on SetEncIf and the Host were unsuccessful. Is there any way to realize this?

Answer 1

I found a solution.
<VirtualHost *:443>
# [...] SSL
SSLProxyEngine On
SSLProxyCheckPeerName Off
ServerName accepted-terms.mydomain.tld
ServerAlias *.accepted-terms.mydomain.tld
SetEnvIf Host ^(.*).accepted.onionroot.network$ new_host=$1
RequestHeader set Host %{new_host}e.onionroot.network
RequestHeader set Cookie "disclaimer_accepted=true"
ProxyPreserveHost On
ProxyPass / https://0.0.0.0:6443/ retry=1 acquire=3000 timeout=600 Keepalive=On
ProxyPassReverse / https://0.0.0.0:6443/
</VirtualHost>
It seems like reordering the configuration solved the issues.