Nchan is a scalable, flexible pub/sub server, built as an NGINX module. Messages are published with POST requests or WebSockets, and channels can be subscribed to using WebSockets, long-polling, EventSource (SSE), or even interval polling.
“It’s time for the Web to take a big step forward in terms of security and privacy. We want to see HTTPS become the default. Let’s Encrypt was built to enable that by making it as easy as possible to get and manage certificates.”