This is an example configuration from running Shopware using caddy. Which is a HTTP/2 web server with automatic HTTPS.
Please only use caddy if you know what you are doing. Shopware AG provides no support for running caddy as appserver. Also note that Shopware will not run faster with caddy. A properly configured apache webserver is in most cases as fast as caddy or nginx.
This configuration is tested with Shopware 5.1 or later.