python - Facebook login with flask-oauthlib not logging in -

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i using flask-aouthlib , following code (import , secret key lines omitted) try implement facebook login. on website have link goes domain.com/login, gets redirected nginx script. 

app = flask(__name__) app.debug = true app.secret_key = 'development' oauth = oauth(app)  facebook = oauth.remote_app(     'facebook',     consumer_key=facebook_app_id,     consumer_secret=facebook_app_secret,     request_token_params={'scope': 'email'},     base_url='https://graph.facebook.com',     request_token_url=none,     access_token_url='/oauth/access_token',     access_token_method='get',     authorize_url='https://www.facebook.com/dialog/oauth' )   @app.route('/') def index():     return redirect(url_for('login'))   @app.route('/login') def login():     callback = url_for(         'facebook_authorized',         next=request.args.get('next') or request.referrer or none,         _external=true     )     return facebook.authorize(callback=callback)   @app.route('/login/authorized') def facebook_authorized():     resp = facebook.authorized_response()     if resp none:         return 'access denied: reason=%s error=%s' % (             request.args['error_reason'],             request.args['error_description']         )     if isinstance(resp, oauthexception):         return 'access denied: %s' % resp.message      session['oauth_token'] = (resp['access_token'], '')     me = facebook.get('/me')     return 'logged in id=%s name=%s redirect=%s' % \         (me.data['id'], me.data['name'], request.args.get('next'))   @facebook.tokengetter def get_facebook_oauth_token():     return session.get('oauth_token')   if __name__ == '__main__':     app.run(host='127.0.0.1',port=8080)

however happens website redirects facebook , displaces error: 

not logged in: not logged in. please login , try again.

it never display facebook login form. if logged in, redirects correctly though.

how display login form?


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