Redmine

Hello,

i have redmine 3.3.6 and rails 4.2.6 and xampp 3.2.2 installed.
I want to have redmine in a subdir of my xampp apache server.
So my rails server is running on port 3000 and the apache on port 80.
In my httpd.conf i configured a virtualhost like this:

<VirtualHost *:80>
    ServerName localhost

    <Location /redmine>
        ProxyPass http://localhost:3000/
        ProxyPassReverse http://localhost:3000/
    </Location>
</VirtualHost>

My problem is:
when i am on my redmine page for example http://localhost/redmine then my page is shown correct, for this i have to add

  ActionController::Base.relative_url_root = "./" 

in my environment.rb, but if i want to click on any link in on the page i get to
http://localhost/login instead of http://localhost/redmine/login.

My question:
How can i add the /redmine prefix for all links on my page?

Best regards Kevin