如何解決400錯誤請求錯誤？

Question

我收到遠程服務器在嘗試運行我的代碼時返回錯誤：（400）錯誤的請求錯誤。任何幫助，將不勝感激。謝謝。

// 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編輯

更改爲：

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

但仍然沒有工作。

編輯

這是我發現的工作原理：

 // 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

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

您發送2個對象

編輯所組成的數組方式：也許你真的想發送什麼只是有2個屬性的對象，那麼這將是string postData = "{ \"username\": \"testname\", \"password\": \"testpass\" }"

Answer 2

看起來好像它可能從您發佈，因爲它是無效的，請參閱下面你要發送什麼，但在一個有效的形式JSON現身：

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

Answer 3

POSTDATA不是有效的JSON對象

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

嘗試使用JSON分析器等Json.Net，JavaScriptSerializer或DataContractJsonSerializer，而不是手動形成它