gistfile1

from twisted.web.resource import Resource
from twisted.internet.task import LoopingCall

class R(Resource):
    isLeaf = True
    def getChild(self, *args):
        return self
    def render(self, req):
        def call():
            req.write("HELLO\r\n")
        loop = LoopingCall(call)
        loop.start(1)
        req.notifyFinish().addBoth(lambda _: loop.stop())
        return 1

resource = R()