VirHost

<VirtualHost *:80>
  ServerName gitlab.example.com
  ServerSignature Off

  ProxyPreserveHost On

  <Location />
    Order deny,allow
    Allow from all

    ProxyPassReverse http://127.0.0.1:8080
    ProxyPassReverse http://gitlab.example.com/
  </Location>

  RewriteEngine on
  RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
  RewriteRule .* http://127.0.0.1:8080%{REQUEST_URI} [P,QSA]

  # needed for downloading attachments
  DocumentRoot /opt/gitlab/embedded/service/gitlab-rails/public

</VirtualHost>