首先-我知道安全隐患，并且我不应该以这种方式这样做。 我正在尝试从IOS应用发送图像并创建图像到FTP服务器。 FTP服务器输入用户名和密码。我不确定自己在做什么错。

错误： 任务。 HTTP加载失败，65805/387字节（错误代码：-1005 [4：-4]） 网络连接丢失。

 func PostImage(){
    let username = "username"
    let password = "password"
    let loginString = String("\(username):\(password)")
    let loginData = loginString.data(using: .utf8)
    let base64LoginString = loginData.base64EncodedString()
    let imagetest = UIImage(named: "ImageTest")

    guard let url = URL(string: "ftp://IPAddress:Port/testfolder") else { return }

                print(url)
                var request = URLRequest(url: url)
                request.httpMethod = "POST"

                let boundary = generateBoundary()
                let data = createData(image: imagetest!,boundary: boundary)

                request.setvalue("multipart/form-data; boundary=\(boundary)",forHTTPHeaderField: "Content-Type")
                **request.setvalue("Basic \(base64LoginString)",forHTTPHeaderField: "Authorization")**


                let session = URLSession.shared

            session.uploadTask(with: request,from: data) {
                (data,response,error) in
                    if let httpresponse = response as? HTTPURLResponse {
                        print(httpresponse.statusCode)
                    }
                if error != nil {
                    print(error!.localizedDescription)
                }

                    if let data = data {
                        do {
                            let json = try JSONSerialization.jsonObject(with: data,options: [])
                            print(json)
                        } catch {
                            print(error)
                        }
                    }
                    }.resume()
            }





  func createData(image: UIImage,boundary: String)-> Data{

            let lineBreak = "\r\n"
            var data = Data()
            let key = "image"
            let fileName = "test"
            let imagedata = image.pngData()
            let mimeType = "image/png"

            data.append("--\(boundary + lineBreak)")
            data.append("Content-Disposition: form-data; name=\"\(key)\"; filename=\"\(fileName)\"\(lineBreak)")
            data.append("Content-Type: \(mimeType + lineBreak + lineBreak)")
            data.append(imagedata!)
            data.append(lineBreak)


            data.append("--\(boundary)--\(lineBreak)")

            return data
     }


  func generateBoundary() -> String {
            return "Boundary-\(NSUUID().uuidString)
  }