# test.py

from nevow import inevow, rend

class WebRoot(rend.Page):
    addSlash = True
    def renderHTTP(self, context):
        request = inevow.IRequest(context)
        request.setHeader('Content-Type', 'text/plain')
        return 'plain text\n'

# test.tac

from nevow import appserver
from twisted.application import internet, service

import test

application = service.Application('test')
site = appserver.NevowSite(test.WebRoot())
web_server = internet.TCPServer(8080, site)
web_server.setServiceParent(application)