I just gave this a try and it didn't give me the result I was expecting. The code I tried is:

def index(self): req = request.current_obj() def long_func(): env = req.environ yield 'I am starting now' #simulate a very long process for i in range(10000): print i yield 'I should be finishing now' res = Response() res.content = long_func() return res

I know that this really does not do anything, I am just trying to get the use-case to work. What I expected to see in the browser was first the "I am starting now" statement, followed by by the print stuff in the cmd window followed by the last statement being sent to the browser. Instead it looks like either its all being sent at once, or the browser is waiting for the page to finish before anything gets rendered. Do you know of any way to test to see which is it?