You are using apache with proxy module, but when you try to get your page, you get a error 500 ?
Check your apache error log, if you get this :
1 | proxy: No protocol handler was valid for the URL /. If you are using a DSO version of mod_proxy, make sure the proxy submodules are included in the configuration using LoadModule. |
You need to enable proxy module :
1 2 | a2enmod proxy_http a2enmod proxy |
And restart you apache server.