crowbar/crowbar-core

<IfModule mod_proxy.c>
        #turning ProxyRequests on and allowing proxying from all may allow
        #spammers to use your proxy to send email.

        ProxyRequests Off

        <Proxy *>
                AddDefaultCharset off
                <%- if node[:apache][:version].to_f < 2.4 %>
                Order deny,allow
                Deny from all
                #Allow from .example.com
                <%- else %>
                Require all denied
                <%- end %>
        </Proxy>

        # Enable/disable the handling of HTTP/1.1 "Via:" headers.
        # ("Full" adds the server version; "Block" removes all outgoing Via: headers)
        # Set to one of: Off | On | Full | Block

        ProxyVia On
</IfModule>