Sse

2012, Django push: Using Server-Sent Events and WebSocket with Django, Curella. https://web.archive.org/web/20121115183325/http://curella.org/blog/django-push-using-server-sent-events-and-websocket/ There are currently a few alternative technologies for pushing events to the browser: Server-Sent Events (SSE) and WebSocket. SSEs are a simpler protocol and are easier to implement, but they provide communication only in one direction

WebSockets is the optimal transport, but other techniques like Server-Sent Events (SSE) and Long Polling are used when other options aren't available. https://learn.microsoft.com/en-au/azure/azure-signalr/signalr-overview