问题：

调试时候跨域访问报：

Request header field authorization is not allowed by Access-Control-Allow-Headers in preflight response.

解决办法：

安装flask_cros

from flask_cors import CORS

CORS(app)

@app.after_request

def af_request(resp):

    resp = make_response(resp)

    resp.headers['Access-Control-Allow-Origin'] = '*'

    resp.headers['Access-Control-Allow-Methods'] = '*'

    resp.headers['Access-Control-Allow-Headers'] = 'Authorization,content-type,token,id'

    resp.headers['Access-Control-Request-Headers'] = 'Origin,X-Requested-With,Accept,Authorization'

    return resp