401 on user timeline via API 1.1


I am trying to get data from a user timeline via API 1.1 with the URL:


I don’t want user needs to log in so I am using the “consumer key/secret” and the “token/secret” generated for my app from:

When I use a token/secret generated from the user log in I can get data from the timeline API above, but if I use the token/secret generated for my application in https://dev.twitter.com/apps I got a ‘401’.

Any idea how to get a working application authentication?