Environment - Ready Api

I have explored about the new feature: "ENVIRONMENT" of "Ready API".

Created New Project and added a new environment to the project. I have provided the end-point as "WSDL URL". The environment endpoint data has following other fields also:

End-point - I am clear(It's nothing but the WSDL URL)

UserName, Password, Domain, WSS-Type, WSS-TimeToLive, Outgoing WSS, Incoming WSS, Proxy Host, Proxy Port, Proxy Username, Proxy password.

Can you please elaborate them in detail?