Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/tornado-2.4-py2.7.egg/tornado/web.py", line 1037, in _execute self.prepare() File "/usr/local/lib/python2.7/dist-packages/tornado-2.4-py2.7.egg/tornado/web.py", line 1487, in prepare raise HTTPError(self._status_code) HTTPError: HTTP 404: Not Found