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

概述后端报错信息 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/ad

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.ioloopimport tornado.webimport Jsonclass 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):        passapplication = 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

总结

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