I would like to be able to run some cleanup functions if and only if the client successfully completes the download of a file I'm serving using Tornado.

I installed the firefox throttle tool and had it slow the connection down to dialup speed and installed this handler to generate a bunch of rubbish random text:

class CrapHandler(BaseHandler):
    def get(self, token):
        crap = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(100000))
        self.write(crap)
        print "done"

I get the following output from tornado immediately after making the request:

done
I 100524 19:45:45 web:772] 200 GET /123 (192.168.45.108) 195.10ms

The client then plods along downloading for about 20 seconds. I expected that it would print "done" after the client was done.

Also, if I do the following I get pretty much the same result:

class CrapHandler(BaseHandler):
    @tornado.web.asynchronous
    def get(self, token):
        crap = ''.join(random.choice(string.ascii_uppercase + string.digits) for x in range(100000))
        self.write(crap)
        self.finish()
        print "done"

Am I missing something fundamental here? Can tornado even support what I'm trying to do? If not, is there an alternative that does?