请教使用 Flask-OAuthlib 申请饭否 OAuth 认证，但是不返回 Access token 的问题

from flask import Flask, session, redirect, url_for, request, render_template, flash from flask_oauthlib.client import OAuth, OAuthException app = Flask(__name__) app.debug = True app.secret_key = 'AA0Zr98j/3yXR~XHH!jmN]LWX/,?RT' oauth = OAuth(app) fanfou = oauth.remote_app( 'fanfou', base_url='http://api.fanfou.com/', request_token_url='http://fanfou.com/oauth/request_token', access_token_url='http://fanfou.com/oauth/access_token', authorize_url='http://fanfou.com/oauth/authorize', consumer_key='这里是我的consumer_key', consumer_secret='这里是我的consumer_secret', ) @fanfou.tokengetter def get_fanfou_token(): return session.get('fanfou_token') @app.route('/') def index(): if 'fanfou_token' not in session: flash('Unable to load fanfou_oauth.') return render_template('index.html') @app.route('/tweet', methods=['POST']) def tweet(): status = request.form['tweet'] if not status: return redirect(url_for('index')) resp = fanfou.post('statuses/update.json', data={ 'status': status }) if resp.status == 403: flash('Your tweet was too long.') elif resp.status == 401: flash('Authorization error with Fanfou.') else: flash('Successfully!') return redirect(url_for('index')) @app.route('/login') def login(): callback = url_for('oauthorized', next=request.args.get('next') or request.referrer or None, _external=True) return fanfou.authorize(callback=callback) @app.route('/logout') def logout(): session.pop('fanfou_token', None) return redirect(url_for('index')) @app.route('/oauthorized') def oauthorized(): next_url = request.args.get('next') or url_for('index') resp = fanfou.authorized_response() # 问题在此，总是返回 None if resp is None: flash('You denied the request to sign in.') if isinstance(resp, OAuthException): flash('Access denied: %s' % resp.message) session['fanfou_token'] = resp return redirect(next_url) if __name__ == '__main__': app.run()