Turn any program that uses STDIN/STDOUT into a WebSocket server
...Out-of-the-box support for serving content using HTTPS and WSS. Restrict which pages can make WebSocket connections. Interact with your WebSocket programs before you've built your frontend.
yxorp is a reverse proxy and application level firewall for the HTTP protocol. It can do all kinds of checks on HTTP traffic, and is highly configurable. It also has other functions that are useful for a web frontend, like load balancing.