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Pyramid: how to check browser cookies support
try: request.headers['Cookie']
 except KeyError:
   return HTTPFound(location=request.route_url('home'))

WebOb Overview: http://docs.webob.org/en/latest/reference.html
WebOb Class Documentation: http://docs.webob.org/en/latest/modules/webob.html

return HTTPfound( "/path/to/redirect", headers=[ (k,v) for (k,v)
    in self.request.response.headers.iteritems() if k == 'Set-Cookie']  )

resp = HTTPFound(location='/path/to/redirect')
return self.request.response.merge_cookies(resp)

delete()
Delete the cookie, and clear the session

invalidate()
Clear the contents and start a new session