I\'m familiar enough with Ajax and JSON that I can send a request and get a parse a JSON request. Ideally I\'d like to receive multiple response to periodically update a pro
JSON is just yet another format of data going over the HTTP protocol (like text, html, pdf, etc). You are probably referring to cometd.
This allows you to open a persistent connection and push data from the server to the client (ie stream it). Any format is valid to push, the client just needs to understand it.