code: private Boolean existsPage(String page) throws MalformedURLException {
          // Searching the page...
          LOGGER.debug("Searching page [{}]...", page);
          LOGGER.debug("Page's real path is [{}]", this.context.getRealPath(page));
          File file = new File(this.context.getRealPath(page));
          Boolean exists = file.exists();
          LOGGER.debug("Page [{}]{}found", page, (exists ? " " : " not "));
          return exists;
      }
docs: Checks if a given page exists in the container and could be served.
  
  @param page
  Page requested.
  @return true if exists, false otherwise.
  @throws MalformedURLException
  if the page's URL is not right.