Use a custom error page in python / tornado

# -*- coding: utf-8 -*-
import tornado.ioloop
import tornado.web

class MainHandler(tornado.web.RequestHandler):
    # self.write_Override error
    def write_error(self, status_code, exc_info=None, **kwargs):
        self.set_header('Content-Type', 'text/html; charset="utf-8"') #Content as appropriate-Declare type(optional)
        if status_code == 503:
            #You can write it directly
            self.finish('<h1>503 Service Temporarily Unavailable</h1>')
        elif status_code == 404:
            #You may prepare a template separately
            self.render('/path/to/templates_dir/404.html',
                #Pass the variable to be embedded in the template as a keyword argument
                message = 'hogehoge'
            )
        #Omission...

    def get(self):
        #Omission...

application = tornado.web.Application([
    #Omission...
])

if __name__ == "__main__":
    application.listen(port=8080)
    tornado.ioloop.IOLoop.instance().start()

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