Tornado在处理add路径的POST请求时，为何出现405 OPTIONS方法错误？

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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)

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 localhost:8888/add 405 (Method Not Allowed)/#/:1 Access to XMLHttpRequest at ‘localhost:8888/add‘ from origin ‘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‘, ‘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

github.com/tornadoweb/tornado/issues/2104

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