Python Flask getting 404 Not Found Error

I'm having the same problem.

I'm doing some experimental CORS tests between backbone and Flask as an endpoint in a different url

Are you using SERVER_NAME in your Config object or when you use the app.run ?

I put the SERVER_NAME but did not specify the port,

class Config(object):    DEBUG = True    TESTING = True    STATIC_FOLDER = STATIC_FOLDER    STATIC_URL = STATIC_URL    NAVIGATION_JS = '/static/js/navigation.js'    SESSION_COOKIE_SECURE = True    REDIS_HOST_SESSION = 'localhost'    REDIS_PORT_SESSION = 6379    REDIS_DB_SESSION = 2    REDIS_HOST = 'localhost'    REDIS_PORT = 6379    REDIS_DB = 3    SERVER_NAME = 'api.jvazquez.com.ar'

Server name doesn't has the port

I also was getting 404 for any of the routes I had defined (if you are interested, I'm using blueprints)

When I send a request to my flask app using curl, I was getting 404, here is the outputI was getting 404 for all of the blueprints that I had defined

jvazquez@aldebaran:~$ curl -i http://api.jvazquez.com.ar:5000/alive/HTTP/1.0 404 NOT FOUNDContent-Type: text/htmlContent-Length: 233   Set-Cookie: session=94c2c120-34c0-4a00-b094-7b5623d438ff; Domain=.api.jvazquez.com.ar; HttpOnly; Path=/Server: Werkzeug/0.9.4 Python/2.7.3Date: Wed, 25 Dec 2013 11:21:16 GMT

So, check if you have defined the config variable SERVER_NAME and it has the port

For whatever reason I encountered this when I set the SERVER_NAME to 127.0.0.1 instead of localhost. I don't know why that was important with my setup, but after changing it to localhost everything started working again.