tornado接收ajax的post请求报错WARNING:tornado.access:405 OPTIONS /add

后端报错信息

WARNING:tornado.access:405 OPTIONS /add (::1) 1.00m

前端报错信息

2xhr.js?ec6c:172 OPTIONS http://localhost:8888/add 405 (Method Not Allowed)/#/:1 Access to XMLHttpRequest at 'http://localhost:8888/add' from origin 'http://localhost:8080' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

解决办法

在代码中实现options方法并设置self.set_header('Access-Control-Allow-Headers', 'Content-Type')

import tornado.ioloop
import tornado.web
import json

class AddHandler(tornado.web.RequestHandler):

    def initialize(self):
        # self.request.method = 'POST'
        # print(self.request.method, type(self.request.method))
        self.set_default_header()

    def get(self):
        self.write("U get story id is ")

    def post(self):
        self.write(json.dumps({"sum": 'rrrrrr'}))

    def set_default_header(self):
        print("setting headers!!!")
        self.set_header('Access-Control-Allow-Origin', '*')
        # self.set_header('Access-Control-Allow-Origin', 'http://localhost:8080')
        # self.set_header('Access-Control-Allow-Headers', 'X-Requested-With')
        self.set_header('Access-Control-Allow-Headers', '*')
        self.set_header('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE, PATCH, OPTIONS')
        self.set_header('Content-Type', 'application/json; charset=UTF-8')
        self.set_header('Access-Control-Allow-Headers', 'Content-Type')

    def options(self):
        pass

application = tornado.web.Application([
    (r"/add", AddHandler),
])

if __name__ == "__main__":
    application.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

参考网址

https://github.com/tornadoweb/tornado/issues/2104

https://stackoverflow.com/questions/19006783/tornado-post-405-method-not-allowed?noredirect=1&lq=1