How to connect cross-domain web-client and signalr hub

Question

How to connect Web-Client with Hub when SignalR Hub has Different Domain and Web-Client has Different Domain. Eg: Web-Client (http://ABC.com/appLogin.html) and SignalR Hub (http://XYZ.com:/appLogin.html) in other hand we can also take localhost but different port number for both, then how we can connect our client to hub and send broadcast message to all.