swift – Alamofire请求缺少“内容长度”

我试图更改标题但仍然无法显示.

我使用Alamofire / multipart form-data成功地将图像文件和一些数据从设备/模拟器发送到服务器.

var parameters = […]

    let url = try! URLRequest(url: “URL”,method: .post,headers: ["Content-type": "multipart/form-data"])

    Alamofire.upload(multipartFormData: { (multipartFormData) in
        for (key,value) in parameters {
            multipartFormData.append((value.data(using: String.Encoding.utf8)!),withName:key)

        }
        multipartFormData.append(UIImageJPEGRepresentation(image!,0.5)!,withName: “Image”,mimeType: "image/jpeg")

    },to: "(url)",encodingCompletion: {(encodingResult) in

        switch encodingResult {
        case .success(let upload,_,_):
            //print(result)
            upload.uploadProgress(closure: { (Progress) in

                self.progressView.progress = Float(Progress.fractionCompleted)
                print("Upload Progress: (Progress.fractionCompleted)")
            })


            print("REQUEST = (request)")
            print(encodingResult)

            upload.responseJSON { response in

                //self.delegate?.showSuccessAlert()
                print( response.request)  // original URL request
                print(response.response) // URL response
                print(response.data)     // server data
                print(response.result)   // result of response serialisation
                // self.showSuccesAlert()
                //self.removeImage("frame",fileExtension: "txt")
                if let JSON = response.result.value {
                    print("JSON: (JSON)")
                }
            }

        case .failure(let encodingError):
            //self.delegate?.showFailAlert()
            print(encodingError)
        }
    })

更新：即使在保留标题后：nil,它也不会显示.

收到alamofire： –

--alamofire.boundary.cc9684e085522290
Content-Disposition: form-data; xyz="abc"

123456
--alamofire.boundary.cc9684e085522290

如何获取每个多部分数据的内容长度？