It should be possible without a redirection, that when I visit http://webmail.domain.tld the webaccess is opened.
Now we have to use http://webmail.domain.tld/gw/webacc.

I already tried changing the gw.conf in apach2/conf.d.
I changed ProxyPass /gw/webacc to / and added ProxyPassRevers like the ProxyPass.

When I launch now webmail.domain.tld I only get a grey page.
I see in the web page still url to /gw/webacc and this will be done on tomcat level?

Somebody a working solution?