def april(req):
	if 'X-April' in req.headers:
		try:
			year = int(req.headers['X-April'])
			return {'april': year}
		except:
			pass # Fall-back to regular behaviour
	
	import datetime
	today = datetime.date.today()
	if today.day == 1 and today.month == 4:
		return {'april': today.year}
	return {}