docs: @Nonnull
    public static StringBuffer getRequestRequestURL (@Nullable final HttpServletRequest aRequest)
    {
      StringBuffer ret = null;
      if (aRequest != null)
        try
        {
          ret = aRequest.getRequestURL ();
        }
        catch (final Exception ex)
        {
          // fall through
          if (isLogExceptions ())
            if (LOGGER.isWarnEnabled ())
              LOGGER.warn ("[ServletHelper] Failed to determine request URL of HTTP request", ex);
        }
      return ret != null ? ret : new StringBuffer ();
    }