def index(self):
        """Produce HTTP response body of links page app index URI."""
        # Note the way we link to the extra links page (and back).
        # As you can see, this object doesn't really care about its
        # absolute position in the site tree, since we use relative
        # links exclusively.
        return """
            <p>Here are some useful links:</p>

            <ul>
                <li>
                    <a href="http://www.cherrypy.dev">The CherryPy Homepage</a>
                </li>
                <li>
                    <a href="http://www.python.org">The Python Homepage</a>
                </li>
            </ul>

            <p>You can check out some extra useful
            links <a href="./extra/">here</a>.</p>

            <p>[<a href="../">Return</a>]</p>
        """
Produce HTTP response body of links page app index URI.
cherrypy/tutorial/tut04_complex_site.py