// NOTE: If you don't always include OnDone, OnFail in the method signitures the invoker (e.g. UI) can't handle them.
public void Get(int id, Action <User> onDone, Action <object> onFail)
{
string url = string.Format("http://my.api.com/api/user/{0}", id);
FakeHttpClient.Get <User>(url, onDone, onFail);
}
public void Auth(Auth auth, Action <AuthResponse> onDone, Action <object> onFail)
{
string url = string.Format("http://my.api.com/api/auth");
FakeHttpClient.Post <Auth, AuthResponse>(url, auth, onDone, onFail);
}