嘗試使用C＃接收所有嘗試

Question

新的Dropbox API文檔是在400錯誤連接到Dropbox的API第2版：

https://blogs.dropbox.com/developers/2015/04/a-preview-of-the-new-dropbox-api-v2/

我試圖執行一個簡單的元數據呼叫，但我有很少成功。這裏是我使用的代碼：

private void go() 
    { 
     var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/2-beta/files/get_metadata"); 
     httpWebRequest.ContentType = "text/json"; 
     httpWebRequest.Method = "POST"; 
     httpWebRequest.Headers.Add("Authorization: Bearer xxxxxxxxxxxxxxxxxxx"); 

     using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream())) 
     { 
      string json = "{\"path\": \"/avatar_501.png\"}"; 

      streamWriter.Write(json); 
      streamWriter.Flush(); 
      streamWriter.Close(); 
     } 

     var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse(); 
     using (var streamReader = new StreamReader(httpResponse.GetResponseStream())) 
     { 
      var result = streamReader.ReadToEnd(); 
      this.TextBox1.Text = result; 
     } 
    } 

任何幫助將大規模讚賞！

Answer 1

如果您嘗試此代碼，您會看到400響應的正文，它告訴您text/json不是有效的Content-Type。我將您的代碼轉換爲控制檯應用程序，並且使用Newtonsoft.Json作爲JSON序列化。否則，你的代碼和我之間唯一的區別是增加了異常處理獲得的400

class Program 
{ 
    static void Main(string[] args) 
    { 
     var httpWebRequest = (HttpWebRequest)WebRequest.Create("https://api.dropbox.com/2-beta/files/get_metadata"); 
     httpWebRequest.ContentType = "text/json"; 
     httpWebRequest.Method = "POST"; 
     httpWebRequest.Headers.Add("Authorization: Bearer <REDACTED>"); 

     using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream())) 
     { 
      streamWriter.Write(JsonConvert.SerializeObject(new { 
       path = "/avatar_501.png" 
      })); 
     } 

     HttpWebResponse response; 

     try 
     { 
      response = (HttpWebResponse)httpWebRequest.GetResponse(); 
     } 
     catch (WebException e) 
     { 
      response = (HttpWebResponse)e.Response; 
     } 

     Console.WriteLine("Status code: {0}", (int)response.StatusCode); 
     using (var streamReader = new StreamReader(response.GetResponseStream())) 
     { 
      Console.WriteLine(streamReader.ReadToEnd()); 
     } 

     Console.ReadLine(); 
    } 
} 

身體的輸出如下：

Status code: 400 
Error in call to API function "files/get_metadata": Bad HTTP "Content-Type" header: "text/json". Expecting one of "application/json", "application/json; charset=utf-8", "text/plain; charset=dropbox-cors-hack". 

改變Content-Type到application/json原因呼籲成功。