SockJS is a browser JavaScript library that provides a WebSocket-like object.
http://sockjs.org
JavaScript Libraries and Functions · Framework
Get access to data on 58,220 websites that are SockJS Customers. We know of 4,236 live websites using SockJS and an additional 53,984 sites that used SockJS historically and 2,743 websites in the United States.
Get a list of 58,220 websites using SockJS which includes location information, hosting data, contact details, 4,236 currently live websites and an additional 81,976 domains that redirect to sites in this list. 53,984 sites that used this technology previously and 2,743 websites in the United States currently using SockJS.