let uploadTask1 = session0.uploadTask(with: request, from: Data(), completionHandler: {
        (data, response, error) -> Void in
        //print("upload - \(response)")
    }
)
uploadTask1.resume()

/// upload file
if let filePath = Bundle.main.url(forResource: "subway-lister", withExtension: "json") {
    print("upload filePath: \(filePath)")
    let uploadTask2 = session0.uploadTask(with: request, fromFile: filePath, completionHandler: {
        (data, repsonse, error) -> Void in