def logout_handler(request):
"""Handles logging out
Gets the logout route, deletes the session data, then redirects the user
to the logout route.
"""
session = await get_session(request)
on_logout = request.app[APP_KEY]['ON_LOGOUT']
# Delete the session key and redirect to the logout url
del session[SESSION_KEY]
return web.HTTPFound(on_logout)
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