WebSockets, developed by Michael Carter and Ian Hickson, essentially is a think transport layer built on top of a device’s TCP/IP stack. A Message Processor handles the messages, finds the server to which a message must be delivered, and sends the message to the Push Server. The message is sent to a push message queue. The call that they use is a single, asynchronous send message call. Senders use the Push Library to send messages to clients. A Push Registry is built to keep track of which client is connected to which server. Each of the clients connects to a Zuul server. Websockets enable the clients to push updates from the edge to the Zuul Servers. The Websocket connections are persistent and async in nature. The clients connect to servers using either WebSockets or SSE.
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