HttpGet is returning null for a specific url

Question

My Code below is working properly when URL="http://rest.riob.us/v3/search/474".

However is returning null for URL="http://dadosabertos.rio.rj.gov.br/apiTransporte/apresentacao/rest/index.cfm/onibus/474".

Both URLs are working fine on webbrowser.

Here is my code:

public class HttpGetAsyncTask  extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {

    return GET(urls[0]);
}
// onPostExecute displays the results of the AsyncTask.
@Override
protected void onPostExecute(String result) {

    Log.w("TAG", "result: " + result);
}

public static String GET(String url){
    InputStream inputStream = null;
    String result = "";
    try {

        // create HttpClient
        HttpClient httpclient = new DefaultHttpClient();

        // make GET request to the given URL
        HttpResponse httpResponse = httpclient.execute(new HttpGet(url));

        // receive response as inputStream
        inputStream = httpResponse.getEntity().getContent();

        Log.v("TAG", "inputStream: " + inputStream);
        Log.e("TAG", "httpResponse.getEntity().getContentLength(): " + httpResponse.getEntity().getContentLength());

        // convert inputstream to string
        if(inputStream != null)
            result = convertInputStreamToString(inputStream);
        else
            result = "Did not work!";

    } catch (Exception e) {
        Log.d("TAG", e.getLocalizedMessage());
    }

    return result;
} 

private static String convertInputStreamToString(InputStream inputStream) throws IOException{
    BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
    String line = "";
    String result = "";
    while((line = bufferedReader.readLine()) != null)
        result += line;

    inputStream.close();
    return result;

}

}

What could be wrong? Tks in advance

Answer 1

If you are doing network requests for an API or JSON, look into the VOLLEY library. It is super simple to use and it handles the queueing, async and caching for you. Example:

RequestQueue queue = Volley.newRequestQueue(this);

JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, URL, new Response.Listener<JSONObject>() {
        @Override
        public void onResponse(JSONObject response) {
            //DO WITH RESPONSE
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            //CRAP ERROR
            Log.e("Volley", error.toString());
        }
    });
queue.add(request);

Seriously If you are going to request for JSON data use Volley its so much simpler! This is all the code you would need for a JSON request, it also offers other built in request types for Images or Strings and even allows custom types.