Idea: Follow redirects

[TorstenH82]

To simplify the usage of the libary it should be possible to get the result after following the redirects:

Currently I need to do that:

Record record = application.getRecords().get(0);
        sSiUrl = "http://" + record.getTarget().toString();
        if (sSiUrl.endsWith(".")) sSiUrl = sSiUrl.substring(0, sSiUrl.length() - 1);

        sSiUrl += ":" + record.getPort() + "/radiodns/spi/3.1/SI.xml";

sSiUrl = getUrlAfterRedirect(sSiUrl);

private String getUrlAfterRedirect(String url) throws IOException {
    HttpURLConnection conn;

    int redirect = 0;
    while (true) {
      if (redirect > 3) {
        Logger.d("RadioDnsLogo: Too many redirects!");
        return null;
      }
      URL base;
      try {
        base = new URL(url);
      } catch (MalformedURLException ex) {
        Logger.d(String.format("RadioDnsLogo: malformed url '%s'", url));
        return null;
      }

      conn = (HttpURLConnection) base.openConnection();
      switch (conn.getResponseCode()) {
        case HttpURLConnection.HTTP_MOVED_PERM:
        case HttpURLConnection.HTTP_MOVED_TEMP:
          String location = conn.getHeaderField("Location");
          location = URLDecoder.decode(location, "UTF-8");
          URL next;
          try {
            next = new URL(base, location); // Deal with relative URLs
          } catch (MalformedURLException ex) {
            Logger.d(
                String.format("RadioDnsLogo: malformed url base=%s location=%s", base, location));
            return null;
          }
          url = next.toExternalForm();
          redirect++;
          continue;
      }
      return url;
    }
  }