when(method, url, [data], [headers], [keys]);
Creates a new backend definition.
Parameters
Param Type Details method string HTTP method. url stringRegExpfunction(string) HTTP url or function that receives a url and returns true if the url matches the current definition. data (optional) stringRegExp HTTP request body. headers (optional) Objectfunction(Object) HTTP headers or function that receives http header object and returns true if the headers match the current defin