A component that can execute the SockJS "Info" request that needs to be
performed before the SockJS session starts in order to check server endpoint
capabilities such as whether the endpoint permits use of WebSocket.
Container for the base URL of a SockJS endpoint with additional helper methods
to derive related SockJS URLs: specifically, the info
and transport URLs.
Exposes information, typically to Transport and
session implementations, about a request
to connect to a SockJS server endpoint over a given transport.