android call to webapi response 401

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Mobile

Android

WebAPI

I have a webapi project where my android client retreives data. The webapi is secured by BearerToken authentication. The client is aware of that and successfully gets a bearer token.

Now my problem is, that on every second request to the same url with the same parameters I get a 401 Unauthorized response from the webapi. What drives me crazy is that the Bearer token does not change between the two requests and the header is correctly set on both requests.

How is that possible?

Here is my android code:

HttpClient httpclient = new DefaultHttpClient();
// Prepare a request object
HttpGet httpget = new HttpGet(args[0]);
httpget.addHeader("Authorization", "Bearer " + BearerToken);

// Execute the request
HttpResponse response;

JSONArray arr = new JSONArray();
try {
   response = httpclient.execute(httpget);

   HttpEntity entity = response.getEntity();

   if (entity != null && response.getStatusLine().getStatusCode() == 200) {
            // A Simple JSON Response Read
            InputStream instream = entity.getContent();
            String result = convertStreamToString(instream);
            arr=new JSONArray(result);
            instream.close();

        }
    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        Log.e("EXCEPTION",e.toString());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        Log.e("EXCEPTION",e.toString());
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        Log.e("EXCEPTION",e.toString());
    }