使用Alamofire将文件上传到S3会返回错误

Question

我尝试使用预先签名的请求将文件上传到S3。

Alamofire.upload(multipartFormData: { multipartFormData in

    //Attempt 1
    multipartFormData.append(InputStream(data: data), withLength: UInt64(data.count), headers: [
            "Content-Type": " "
            ])

    //Attempt 2
    //multipartFormData.append(data, withName: "file", fileName: fileName, mimeType: "application/json")

}, with: router) { encodingResult in

        switch encodingResult {
        case .success(let upload,_,_):
            upload.validate()
            upload.uploadProgress(closure: { progress in

                guard let progressCallback = progressCallback else { return }
                progressCallback(progress.fractionCompleted)
            })

            upload.responseString(completionHandler: { response in

                switch response.result {
                case .success(let json):
                    self.handleSuccessResponse(withJson: json, toCallback: callback)
                case .failure(let error):
                    self.handleFailResponse(withData: response.data, toCallback: callback)
                }
            })

        case .failure:
            break
        }
    }

我正在获取状态代码403

并回复：

<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<Error>

<Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>
<AWSAccessKeyId>************</AWSAccessKeyId>
<StringToSign>POST\n\nmultipart/form-data; 
boundary=alamofire.boundary.e001fb3981bbd6fc\n1522072451\nx-amz- 
server-side-encryption:AES256\n/api/****/test.json</StringToSign>

如果我理解正确的问题是boundary=alamofire.boundary.e001fb3981bbd6fc

如何删除此内容？

由于