code: def top_level_index_page(config):
      
      title = "IIIF Test Server on %s" % (config.host)
      body = "<ul>\n"
      for prefix in sorted(config.prefixes.keys()):
          body += '<li><a href="/%s">%s</a></li>\n' % (prefix, prefix)
      body += "</ul>\n"
      return html_page(title, body)
docs: HTML top-level index page which provides a link to each handler.