code: public static InputStream getUrlAsStream(URL url, String acceptValue) throws IOException {
          HttpURLConnection connection = (HttpURLConnection) url.openConnection();
          connection.setRequestMethod("GET");
          if (acceptValue != null && !acceptValue.trim().isEmpty()) {
              connection.setRequestProperty("Accept", acceptValue);
          }
          final int responseCode = connection.getResponseCode();
          if (responseCode == HttpURLConnection.HTTP_OK) {
              return connection.getInputStream();
          } else {
              if (isEventEnabled(tc)) {
                  Tr.event(tc, "Did not find resource at " + url + ".  ResponseCode: " + responseCode);
              }
          }
          return null;
      }
docs: Get the resource at the specified URL as an InputStream
  
  @param url - resource location
  @param acceptValue - Request property for 'Accept' header