I used to request a user timeline with /statuses/user_timeline/xtien.xml?count=24
where xtien is a user screen name. because this doesn't work when the screen name is numeric - Twitter sees the user name as the id, not the screen name - I changed it to /statuses/user_timeline.xml?screen_name=xtien?count=24 However, this gives a 401 response. The request is authenticated. Why is there a difference between both methods? Or what's wrong in the second request?
