def implicit_uri(redirect_uri, scope = nil)
    response_type = "token"
    response_type = "#{response_type} id_token" if scope && (scope.include? "openid")
    @target + authorize_path_args(response_type, redirect_uri, scope)
  end
def implicit_uri(redirect_uri, scope = nil)
    response_type = "token"
    response_type = "#{response_type} id_token" if scope && (scope.include? "openid")
    @target + authorize_path_args(response_type, redirect_uri, scope)
  end
Constructs a uri that the client is to return to the browser to direct
 the user to the authorization server to get an authcode.
 @param [String] redirect_uri (see #authcode_uri)
 @return [String]