Live SDK, SkyDrive can't get preview image

Question

  LiveOperationResult operationResult = await disk.Client.GetAsync(file.ID+"/shared_read_link");
  dynamic results = operationResult.Result;
  string sharedLink = results.link;
var ob = BaseMethod.GetMethod("https://apis.live.net/v5.0/skydrive/get_item_preview?url=" + sharedLink.UrlEncode());
           

        public static async Task<object> GetMethod(string url)
        {
            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
            request.Method = "GET";
            request.ContentType = "application/x-www-form-urlencoded";
            request.Accept = "*/*";

            WebResponse response = null;
            string responseStr = null;

            try
            {
                response = await request.GetResponseAsync();

                if (response != null)
                {
                    StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                    responseStr = reader.ReadToEnd();
                    reader.Dispose();
                }
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                request = null;
                response = null;
            }

            return responseStr;
        }

It will throw an exception "The remote server returned an error: (415) Unsupported Media Type." at

response = await request.GetResponseAsync();

The request url is "https://apis.live.net/v5.0/skydrive/get_item_preview?url=https%3A%2F%2Fskydrive.live.com%2Fredir.aspx%3Fcid%3D3cc46a01f286fe39%26resid%3D3CC46A01F286FE39!136%26parid%3D3CC46A01F286FE39!114%26authkey%3D!AKH7VXwhgQKpT9Y" which return a 404 page in browser.

Answer 1

Tested the url you request in Google chrome browser, its response is one JSON:

{
   "error": {
      "code": "resource_not_found", 
      "message": "The requested resource 'https://skydrive.live.com/redir.aspx?cid\u003d3cc46a01f286fe39\u0026resid\u003d3CC46A01F286FE39!136\u0026parid\u003d3CC46A01F286FE39!114\u0026authkey\u003d!AKH7VXwhgQKpT9Y' is missing a picture of type 'normal'."
   }
}

And also I tested the original link you posted, the resource has been deleted. Please ensure the source can be accessed and exist in SkyDrive. For how to get the preview, yes, you could get from this document: http://msdn.microsoft.com/en-us/library/live/hh826545.aspx#preview

---

Bob Bao [MSFT]
MSDN Community Support | Feedback to us

Answer 2

Thank you for your reply and Sorry for my mistake:

Here is a share link: https://skydrive.live.com/redir.aspx?cid=3cc46a01f286fe39&resid=3CC46A01F286FE39!136&parid=3CC46A01F286FE39!114&authkey=!AHfuLroSMte612M

and its UrlEncode is https%3A%2F%2Fskydrive.live.com%2Fredir.aspx%3Fcid%3D3cc46a01f286fe39%26resid%3D3CC46A01F286FE39!136%26parid%3D3CC46A01F286FE39!114%26authkey%3D!AHfuLroSMte612M

so the actually url is 

https://apis.live.net/v5.0/skydrive/get_item_preview?type=normal&url=https%3A%2F%2Fskydrive.live.com%2Fredir.aspx%3Fcid%3D3cc46a01f286fe39%26resid%3D3CC46A01F286FE39!136%26parid%3D3CC46A01F286FE39!114%26authkey%3D!AHfuLroSMte612M

The share link is right, but the response is 

{
   "error": {
      "code": "resource_not_found", 
      "message": "The requested resource 'https://skydrive.live.com/redir.aspx?cid\u003d3cc46a01f286fe39\u0026resid\u003d3CC46A01F286FE39!136\u0026parid\u003d3CC46A01F286FE39!114\u0026authkey\u003d!AHfuLroSMte612M' is missing a picture of type 'normal'."
   }
}

And it causes an exception in my app:The remote server returned an error: (404) Not Found.

I comment some code 

//request.ContentType = "application/x-www-form-urlencoded";
            //request.Accept = "*/*";