如何解决400错误请求错误？

Question

我收到远程服务器在尝试运行我的代码时返回错误：（400）错误的请求错误。任何帮助，将不胜感激。谢谢。

// Open request and set post data 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("myurl.com/restservice/Login"); 
    request.Method = "POST"; 
    request.ContentType = "application/json; charset:utf-8"; 
    string postData = "{ \"username\": \"testname\" },{ \"password\": \"testpass\" }"; 

    // Write postData to request url 
    using (Stream s = request.GetRequestStream()) 
    { 
     using (StreamWriter sw = new StreamWriter(s)) 
      sw.Write(postData); 
    } 

    // Get response and read it 
    using (Stream s = request.GetResponse().GetResponseStream()) // error happens here 
    { 
     using (StreamReader sr = new StreamReader(s)) 
     { 
      var jsonData = sr.ReadToEnd(); 
     } 
    } 

JSON编辑

更改为：

{ \"username\": \"jeff\", \"password\": \"welcome\" } 

但仍然没有工作。

编辑

这是我发现的工作原理：

 // Open request and set post data 
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create("myurl.com/restservice/Login"); 
    request.Method = "POST"; 
    request.ContentType = "application/json"; 
    string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }"; 

    // Set postData to byte type and set content length 
    byte[] postBytes = System.Text.UTF8Encoding.UTF8.GetBytes(postData); 
    request.ContentLength = postBytes.Length; 

    // Write postBytes to request stream 
    Stream s = request.GetRequestStream(); 
    s.Write(postBytes, 0, postBytes.Length); 
    s.Close(); 

    // Get the reponse 
    WebResponse response = request.GetResponse(); 

    // Status for debugging 
    string ResponseStatus = (((HttpWebResponse)response).StatusDescription); 

    // Get the content from server and read it from the stream 
    s = response.GetResponseStream(); 
    StreamReader reader = new StreamReader(s); 
    string responseFromServer = reader.ReadToEnd(); 

    // Clean up and close 
    reader.Close(); 
    s.Close(); 
    response.Close(); 

Answer 1

可以尝试string postData = "[{ \"username\": \"testname\" },{ \"password\": \"testpass\" }]";

您发送2个对象

编辑所组成的数组方式：也许你真的想发送什么只是有2个属性的对象，那么这将是string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }"

Answer 2

看起来好像它可能从您发布，因为它是无效的，请参阅下面你要发送什么，但在一个有效的形式JSON现身：

{ 
    "username": "testname", 
    "password": "testpass" 
} 

Answer 3

POSTDATA不是有效的JSON对象

{ "username": "testname" },{ "password": "testpass" } 

尝试使用JSON分析器等Json.Net，JavaScriptSerializer或DataContractJsonSerializer，而不是手动形成它