             credentials: credentials,
             headerParameters: defaultHeaders,
             acceptType: "application/json",
-            contentType: nil,
             queryItems: nil,
             messageBody: nil
         )

            credentials: credentials,
            headerParameters: defaultHeaders,
            acceptType: "application/json",
            contentType: nil,
            queryItems: nil,
            messageBody: nil
        )

            credentials: credentials,
            headerParameters: defaultHeaders,
            acceptType: "application/json",
            queryItems: queryParameters,
            messageBody: nil
        )
