Traceback (most recent call last): File "/usr/local/python3/lib/python3.4/site-packages/tornado/web.py", line 1422, in _execute result = self.prepare() File "/usr/local/python3/lib/python3.4/site-packages/tornado/web.py", line 2149, in prepare raise HTTPError(self._status_code) tornado.web.HTTPError: HTTP 404: Not Found