def error404(e):
	"""
	404 error handler.
	"""
	return ''.join([
		'<html><body>',
		'<h1>D20 - Page Not Found</h1>',
		'<p>The only endpoint available on this entropy micro-service is <a href="/api/entropy">/api/entropy</a>.</p>',
		'<p>For more information including the complete source code, visit <a href="https://github.com/AgalmicVentures/D20">the D20 repository</a>.</p>',
		'</body></html>',
	]), 404