c# - HttpClient POST 到 WCF 返回 400 错误请求

Question

我有一个自托管的 WCF 服务，它公开了一个具有以下签名的 Web POST 方法:

[ServiceContract]
public interface IPublisherService
{
    [OperationContract]
    [WebInvoke(UriTemplate = "Send", Method = "POST")]
    void SendMessage(string message);
}

如果我使用具有以下结构 ( http://localhost:8080/Publisher/Send ) 的 Fiddler 发送请求:

WCF 返回 200 OK 并将响应正确反序列化为 JSON:

但是当我尝试从 C# 控制台应用程序使用 HttpClient 时，我总是无缘无故地返回 400 Bad Request。这是请求:

using (HttpClient client = new HttpClient())
{
    var content = new StringContent(this.view.Message);
    content.Headers.ContentType = new MediaTypeHeaderValue("Application/Json");
    var response = client.PostAsync(
        new Uri("http://localhost:8080/Publisher/Send"), 
        content);
    var result = response.Result;
    this.view.Message = result.ToString();
}

响应始终为 400，无论我使用 client.PostAsync 还是 clint.SendAsync 都没有关系。

StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Date: Tue, 29 Dec 2015 12:41:55 GMT
  Server: Microsoft-HTTPAPI/2.0
  Content-Length: 1647
  Content-Type: text/html
}

Answer 1

我不知道这是否有意义，但答案是我的字符串内容格式不正确。我已经使用 Newtonsoft.Json 更改了请求，现在它可以工作了:

using (HttpClient client = new HttpClient())
{                
    var request = new StringContent(
        JsonConvert.SerializeObject(this.view.Message), 
        Encoding.UTF8, 
        "application/json");
    var response = client.PostAsync(
        new Uri("http://localhost:8080/Publisher/Send"), 
        request);
    var result = response.Result;
    view.Message = result.ToString();
}