Facebook redirect url issue OAuthException

Question

My app was working well for long time, but now I am getting the error from Facebook saying:

Content: {"error":{"message":"Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request","type":"OAuthException","code":100}}

https://www.facebook.com/dialog/oauth/?client_id=163840537126360&redirect_uri=http://mycloud.niranjan.com/facebook/callback//empty/?vTitle=Facebook&scope=email,sms,user_about_me,friends_about_me,user_activities,friends_activities,user_birthday,friends_birthday,user_education_history,friends_education_history,user_events,friends_events,user_likes,friends_likes,user_location,friends_location,user_photos,friends_photos,user_videos,friends_videos,user_relationships,friends_relationships,user_status,friends_status,user_checkins,friends_checkins,read_stream,publish_stream

Can anyone suggest a solution for this one?

Answer 1

I realize this is 6 weeks late, but I figured I'll post this here since I found a fix that worked for us. Had the same issue and after trying to encode the return url (which did not work), I realized that we were building our URL like:

$url = "http://example.com/"; $redirect_script = "/cgi-bin/redirect.cgi";  $redirect_url = $url . $redirect_script; 

However this resulted in a return URL that looked like http://example.com//cgi-bin/redirect.cgi -- note the "//" after example.com. When I removed the double-slashes from this URL, it worked again. OP, I see that your redirect URL has the same thing in /facebook/callback//empty?etc which I believe is what's messing it up.

Answer 2

In my case I was using http://127.0.0.1:8000 - However FB changes that automatically to http://127.0.0.1:8000/ in the OAuth redirect to deal wihh passing query params. Changing my URL in my code to have an end slash solved the issue for me. I suspect they are storing the final useable version and comparing that to the 2nd request.