Could WSGI handle Asynchronous response?

[est]

I am writing a small 'comet'-like app using flup, something like this:


def myapp(environ, start_response) :
start_response( '200 OK', [('Content-Type', 'text/plain')])
return ['Flup works!\n'] <-------------Could this be part
of response output? Could I time.sleep() for a while then write other
outputs?

if __name__ == '__main__':
from flup.server.fcg i import WSGIServer
WSGIServer(myap p, multiplexed=Tru e, bindAddress=('0 .0.0.0',
8888)).run()


So is WSGI really synchronous? How can I handle asynchronous outputs
with flup/WSGI ?