HTTP POST 请求在 Postman 中有效，但在代码中无效

Question

有一个外部 API，我必须向它发布一些对象才能获取一些数据。

我在 Postman 中尝试过，效果很好，如下所示：

我也在用 C# 编写的 ASP.NET MVC 应用程序中进行了尝试：

public class TestingController : SurfaceController
{
    [System.Web.Http.HttpGet]
    public async System.Threading.Tasks.Task<ActionResult> Hit()
    {
        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));

        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

        Order order = new Order();
        ClientDetailsModel ClientDetails = new ClientDetailsModel();
        ProductDetailsModel ProductDetails = new ProductDetailsModel();
        ShippingAdressModel ShippingAdress = new ShippingAdressModel();

        ClientDetails.ClientName = "x";
        ClientDetails.Email = "x";
        ClientDetails.Note = "x";
        ClientDetails.Tel = "x";

        ProductDetails.ColorID = "1";
        ProductDetails.Quantity = "1";
        ProductDetails.SizeID = "1";
        ProductDetails.ProductMatrixRecordID = "1";

        ShippingAdress.City = "x";
        ShippingAdress.CountryID = "1";
        ShippingAdress.PostalAddress = "x";
        ShippingAdress.Street = "x";
        ShippingAdress.StreetAddress = "x";

        order.ResponseType = "JSON";
        order.Token = "P74kXRjM4W44l9qNw8u3";
        order.PaymentMode = "1";
        order.ProductDetails = ProductDetails;
        order.ShippingAddress = ShippingAdress;
        order.ClientDetails = ClientDetails;
        order.CurrencyAbbreviation = "JOD";

        var response = await client.PostAsJsonAsync<Order>("https://bmswebservices.itmam.com/OrderingManagement/Orders.asmx/PlaceOrder", order);
        response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/x-www-form-urlencoded");

        if (!response.IsSuccessStatusCode)
        {
            Console.WriteLine("ERROR:  Products Not Posted." + response.ReasonPhrase);
            return null;
        }

        var cs = await response.Content.ReadAsAsync<Order>();

        return Json(cs); 
    }
}

我收到 HTTP 500 内部服务器错误：

注意：我对其他 API 使用了相同的方式，但与此不同的是将整个对象发送到服务器。

任何人都可以帮助如何将对象应用于具有内容类型的服务器application/x-www-form-urlencoded？

Answer 1

在邮递员图像中，您正在发布表单数据并获得 json 响应。

在您调用的 c# 代码中PostAsJsonAsync，它将发送 JSON 内容类型。

使用FormUrlEncodedContent并用要发送的数据填充它。

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

//...code omitted for brevity

var order = new Dictionary<string, string>();

order["ResponseType"] = "JSON";
order["Token"] = "P74kXRjM4W44l9qNw8u3";
order["PaymentMode"] = "1";
order["ProductDetails"] = JsonConvert.SerializeObject(ProductDetails);
order["ShippingAddress"] = JsonConvert.SerializeObject(ShippingAdress);
order["ClientDetails"] = JsonConvert.SerializeObject(ClientDetails);
order["CurrencyAbbreviation"] = "JOD";

var content = new FormUrlEncodedContent(order);

var url = "https://bmswebservices.itmam.com/OrderingManagement/Orders.asmx/PlaceOrder";
var response = await client.PostAsync(url, content);    
if (!response.IsSuccessStatusCode) {
    Console.WriteLine("ERROR:  Products Not Posted." + response.ReasonPhrase);
    return null;
}

var cs = await response.Content.ReadAsAsync<Order>();

return Json(cs);