users service

from google.appengine.ext import webapp

from google.appengine.ext.webapp.util import run_wsgi_app

from google.appengine.api import users

class MainPage(webapp.RequestHandler):

def get(self):

user = users.get_current_user()

if user:

self.response.headers['Content-Type'] = 'text/plain'

self.response.out.write('Hello, ' + user.nickname())

else:

self.redirect(users.create_login_url(self.request.uri))

application = webapp.WSGIApplication( [('/', MainPage)], debug=True)

def main():

  run_wsgi_app(application)

if __name__ == "__main__":

  main()

self.request.uri is current uri. Hence, after successful login, user can back here