pyramid and render_to_resposne

app.py

from wsgiref.simple_server import make_server
from pyramid.config import Configurator
from pyramid.response import Response
from pyramid.renderers import render_to_response, render

def json_bad(request):
    return render_to_response('json', {'hello': 'world'})

def json_good(request):
    return render_to_response('json', {'hello': 'world'}, request=request)


def main():
    config = Configurator()

    config.add_route('json:bad', '/json/bad')
    config.add_view(json_bad, route_name='json:bad')

    config.add_route('json:good', '/json/good')
    config.add_view(json_good, route_name='json:good')

    app = config.make_wsgi_app()
    return app

if __name__ == '__main__':
    app = main()
    server = make_server('0.0.0.0', 6547, app)
    print ('Starting up server on http://localhost:6547')
    server.serve_forever()