Tornado methods for capturing and handling 404 errors

Tornado is mentioned in the documentation, but this can only catch errors in the path requests listed in handlers.

If you only define a rule (r "/hello", Hellohandler), you can only capture/hello/other, such as undefined path requests, like/he,/helloworld,/he/ Other such will directly display the Tornado default 404 error page without displaying the custom error page.

The workaround is simply to add one (r ". *", Basehandler) at the end of the routing rule to capture all requests not captured by other rules, overwrite the Get method, and invoke the custom Write_error method in the method. Cases:

The code is as follows:

Class Basehandler (Tornado.web.RequestHandler):
def get (self):
Self.write_error (404)

def write_error (self, Status_code, **kwargs):
if Status_code = = 404:
Self.render (' public/404.html ')
Elif Status_code = = 500:
Self.render (' public/500.html ')
Else
Self.write (' ERROR: ' + str (status_code))

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