引数としてenvironの変数を渡す
http://pylonsbook.com/en/1.1/urls-routing-and-dispatch.html#conditions
def referals(environ, result):
result['referer'] = environ.get('HTTP_REFERER')
return True
You could use this function in a route like this to add the referrer to the matched routing variables:
map.connect('/{controller}/{action}/{id}', conditions=dict(function=referals))
