C# 为什么我的网络请求被接收为；获得；当我'；m将该方法设置为"；POST"；？

我使用WebRequest类将数据发布到Amazon MerchantFullfillment uri（如中所述）

我明白了

<?xml version="1.0"?>
<ErrorResponse xmlns="http://mws.amazonservices.com/MerchantFulfillment/2015-06-01">
  <Error>
    <Type>Sender</Type>
    <Code>InvalidParameterValue</Code>
    <Message>Either Action or Operation query parameter must be present.</Message>
  </Error>
  <RequestID>03f0e2ca-4c30-4012-9888-c33acc83446f</RequestID>
</ErrorResponse>

我正在postData中发送操作查询参数“&Action=GetEligibleShippingServices”。这是我的代码——我更改了端点url以尝试查看请求

public void CreateAWSMessage(DateTime timestamp, ShipmentRequestDetails srd)
{
    NameValueCollection awsField = new NameValueCollection();

    string stringToSign = StringToSign(timestamp, srd, awsField);

    string signature = CreateMessageSignature(srd, awsField, stringToSign);

    string signedString = stringToSign + "&Signature=" + signature;

    //string url = @"https://mws.amazonaws.com/MerchantFulfillment/2015-06-01";
    string url = @"http://localhost/WebApplication1/Service.aspx";

    WebRequest gess = WebRequest.Create(url);
    HttpWebRequest httpGESS = (HttpWebRequest)gess;
    string tmp = gess.Method;

    httpGESS.Method = "POST";

    httpGESS.ContentType = "x-www-form-urlencoded";

    byte[] bytes = Encoding.UTF8.GetBytes(signedString);
    httpGESS.ContentLength = bytes.Length;
    using (Stream stream = httpGESS.GetRequestStream())            
    {
        stream.Write(bytes, 0, bytes.Length);
    }

    string responseString;
    using (StreamReader streamResponse = new StreamReader(httpGESS.GetResponse().GetResponseStream()))
    {
        responseString = streamResponse.ReadToEnd();
    }
}

当我在调试WebApplication1（端点）中查看请求时，它将内容显示为空，方法显示为“GET”。这就解释了API为什么不接收操作查询参数。为什么端点看不到请求负载，或者它是一个“POST”

以下是经过消毒的signedString：

AWSAccessKeyId=myAWSAccessKeyID&Action=GetEligibleShippingServices&MWSAuthToken=myMWSAuthToken&SellerId=mySellerID&ShipmentRequestDetails.AmazonOrderId=TST-1234567-1234568&ShipmentRequestDetails.ItemList.Item.1.OrderItemId=Item1&ShipmentRequestDetails.ItemList.Item.1.Quantity=2&ShipmentRequestDetails.MustArriveByDate=2016-12-31T01%3a15%3a52Z&ShipmentRequestDetails.PackageDimensions.Height=9&ShipmentRequestDetails.PackageDimensions.Length=7&ShipmentRequestDetails.PackageDimensions.Unit=inches&ShipmentRequestDetails.PackageDimensions.Width=8&ShipmentRequestDetails.SellerOrderId=TST-1234567-1234568&ShipmentRequestDetails.ShipDate=2016-12-27T01%3a15%3a52Z&ShipmentRequestDetails.ShipFromAddress.AddressLine1=799%20Central%20Ave&ShipmentRequestDetails.ShipFromAddress.AddressLine2=&ShipmentRequestDetails.ShipFromAddress.AddressLine3=&ShipmentRequestDetails.ShipFromAddress.City=Los%20Angeles&ShipmentRequestDetails.ShipFromAddress.CountryCode=US&ShipmentRequestDetails.ShipFromAddress.Email=jp%40example.com&ShipmentRequestDetails.ShipFromAddress.Name=JP%20test&ShipmentRequestDetails.ShipFromAddress.Phone=310-555-1212&ShipmentRequestDetails.ShipFromAddress.PostalCode=90021&ShipmentRequestDetails.ShipFromAddress.StateOrProvinceCode=CA&ShipmentRequestDetails.ShippingServiceOptions.CarrierWillPickUp=False&ShipmentRequestDetails.ShippingServiceOptions.DeliveryExperience=DeliveryConfirmationWithoutSignature&ShipmentRequestDetails.Weight.Unit=ounces&ShipmentRequestDetails.Weight.Value=120&SignatureMethod=HmacSHA256&SignatureVersion=2&Timestamp=2016-12-26T21%3a53%3a05Z&Version=2015-06-01&Signature=d9rvl0XO7CbKuR+wNvCwh56ux5oNY/wv3I6z79+fG1M

---

为什么不使用HttpClient？如果StringToSign方法可能已经在执行此操作，请在将字符串写入流之前尝试对其进行编码。var urlEncodedString=HttpUtility.UrlEncode（signedString）；类似的内容，否则可能无法正确地包含在您的帖子中。@Woot signedString包含在内。这似乎不是MWS的问题，而是在C#中使用HttpWebRequest的问题。您可能希望查看以下内容：