ajax - how to work with a network socket (if correct term) in general and in Chrome

Question

I have encountered something new in Chrome which I've not seen before and am unfamiliar with. It appears to be some type of persistent socket (best term I know of).

Up to now I've been familiar with each AJAX call being the way to contact a server, each with a request/response if the connection is successful. And each one would show in the Name column in the console. Plus, I could "Replay XHR" as an option. And the tabs Headers/Preview/Response/Timing were helpful. However this appears to be grouped and the data I see in the chat window I can't find in any of the JSON objects on the list. What is the correct name for this, and is there any way to see the individual headers/response from each call?

This is a screenshot:

标签： ajaxgoogle-chromegoogle-chrome-console