WebSocket reverse proxy with Apache 2.4

To allow access to my local smartMeterLogger I setup a virtual host energie.wasietsmet.nl.

This means setting up a reverse proxy for the websocket running on the smartMeterLogger.
First thing to do is to enable proxy_wstunnel with a2enmod.
Then set up the virtual host. See below how to.
Don’t forget to reload the settings in Apache2!

<VirtualHost *:80>
ServerName energie.wasietsmet.nl

  ProxyRequests Off
  ProxyPreserveHost On
  ProxyPass / ""
  ProxyPassReverse / ""
  RewriteEngine on
  RewriteCond %{HTTP:UPGRADE} ^WebSocket$ [NC]
  RewriteCond %{HTTP:CONNECTION} ^Upgrade$ [NC]
  RewriteRule .* ws://{REQUEST_URI} [P]

SetEnvIf Request_URI "^/events" dontlog
SetEnvIf Request_URI "^/raw" dontlog
CustomLog "|/usr/bin/rotatelogs /var/www/energie.wasietsmet.nl/log/access%d-%m-%Y 86400" vhost_combined env=!dontlog
ErrorLog "|/usr/bin/rotatelogs /var/www/energie.wasietsmet.nl/log/error%d-%m-%Y 86400"