javascript - Facebook "Invalid redirect_uri", but the url looks fine to me

Question

I'm getting the following error when trying to authenticate to Facebook with OAuth:

{
   "error": {
      "message": "Invalid redirect_uri: Given URL is not allowed by the Application configuration.",
      "type": "OAuthException"
   }
}

My url looks like this:

https://graph.facebook.com/oauth/authorize?client_id=283993944973616&redirect_uri=http://dennys-m.appspot.com/fb_login/&scope=publish_stream,email&display=popup

I know there are a lot of other posts with this problem, but I can't see what would make my url invalid. Any ideas why I'm getting this error?

Answer 1

Your redirect url: http://dennys-m.appspot.com/fb_login/ must match the canvas url in https://developers.facebook.com/apps/ configuration panel.

Fortunately, these days Facebook gives the error message Invalid redirect_uri: Given URL is not allowed by the Application configuration. About a year ago no such exception appeared, just strange results.