code: public static String get(String url, Map<String, String> queryParas, Map<String, String> headers) {
  		HttpURLConnection conn = null;
  		try {
  			conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), GET, headers);
  			conn.connect();
  			return readResponseString(conn);
  		}
  		catch (Exception e) {
  			throw new RuntimeException(e);
  		}
  		finally {
  			if (conn != null) {
  				conn.disconnect();
  			}
  		}
  	}
docs: Send GET request