Graph API not responding

I am using graph API to get the feed post. h开发者_开发问答ttps://graph.facebook.com/128172073865656/feed?limit=200 but it is showing exception

{ "error": { "type": "OAuthException", "message": "An access token is required to request this resource." } }. Could any one please help.

Quite simply, you need to obtain and supply an access token with your request.

In particular, the Graph API connections that you're trying to load have been changed recently, and now require an access_token, where they previously did not.

See the Facebook Developer Blog, posts on this:

• https://developers.facebook.com/blog/post/509/ - Notification of change in requirements.
• https://developers.facebook.com/blog/post/510/ - Confirmation that the changes are now live.