android - InputStream.available() is always 0 -

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i trying connect server android app , json response. using httpurlconnectionto ping server. server running fine since getting response on browser. in code below, inputstream.available() returns 0 , hence cannot parse data. there way response ?

note : below method called inside separate thread (asynctask<void, void, void>)

 private void pingserver(final string serverurl) throws ioexception {          inputstream inputstream = null;          try {              final url url = new url(serverurl);             httpurlconnection conn = (httpurlconnection) url.openconnection();             conn.setreadtimeout(10000);// milliseconds             conn.setconnecttimeout(15000);// milliseconds             conn.setrequestmethod("get");             conn.setdoinput(true);             conn.connect();              inputstream = conn.getinputstream();             string resp = readit(inputstream, inputstream.available());//resp empty :(          } catch (ioexception e) {          } {             if (inputstream != null) {                 inputstream.close();             }         }     }  private string readit(final inputstream stream,final int len) throws ioexception {         final reader reader = new inputstreamreader(stream, "utf-8");         final char[] buffer = new char[len];         reader.read(buffer);         return new string(buffer);     }


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