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Created Feb 7, 2013

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Logout URL for Google App Engine
class LogoutPage(webapp2.RequestHandler):
def get(self):
target_url = self.request.referer or '/'
if os.environ.get('SERVER_SOFTWARE', '').startswith('Development/'):
# On the production instance, we just remove the session cookie, because
# redirecting users.create_logout_url(...) would log out of all Google
# (e.g. Gmail, Google Calendar).
# It seems that AppEngine is setting the ACSID cookie for http:// ,
# and the SACSID cookie for https:// . We just unset both below.
cookie = Cookie.SimpleCookie()
cookie['ACSID'] = ''
cookie['ACSID']['expires'] = -86400 # In the past, a day ago.
self.response.headers.add_header(*cookie.output().split(': ', 1))
cookie = Cookie.SimpleCookie()
cookie['SACSID'] = ''
cookie['SACSID']['expires'] = -86400
self.response.headers.add_header(*cookie.output().split(': ', 1))
app = webapp2.WSGIApplication( [
(r'/logout', LogoutPage ),
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