Which protocol to choose for a cross-browser messenger?

Question

Communication protocols

Tell me how to choose a protocol for a cross-browser messenger, so that on its basis you can write a communication utility that would support any browser, would not slow down, would work stably with a large number of connections and poor communication.
Where to look, what parameters to rely on?

Answer 1

The protocol is websocket.
Bad connection - Don't forget to control how packets are sent from the browser. (try-catch)
Auto-recovery of the connection after the loss of the Internet connection is also done here.
Where to look? (conceptual): websocket examples and event handling in js.