push_payloads_userland.md Background One of the biggest missed opportunities thus far with HTTP/2 ("H/2") is that we are not yet able to sunset WebSockets in favor of H/2. Web Sockets and H/2 both support multiplexing messages bi-directionally and can send both textual and binary data. Server Sent Events ("SSE"), by contrast, are not bi-directional (they're a "server-push-only" channel) and binary