facebook error 'Error validating verification code'

Question

very strange error. i use gide http://developers.facebook.com/docs/authentication/. so i create request to fb and pass redirect_uri. i use test site on localhost. so if i pa

Answer 1

I'm not sure if it will help, but i would suggest to encode only values in the url. Not the whole thing. eg:

redirect_uri='http://localhost/test_blog/index.php?r='.urlencode('site/oauth2');

Answer 2

Had the same problem all day when testing with redirect_uri=http://localhost:8000 (encoded to http%3A%2F%2Flocalhost%3A8000)...

Solution was simply to make sure to put the trailing slash / on the end of the uri. So redirect_uri=http://localhost:8000/ (encoded to http%3A%2F%2Flocalhost%3A8000%2F).

Again, make sure the redirect_uri is identical for both requests.

Answer 3

You don't really need to encode, just put the '/' at the end of your redirect_url and everything should be fine!

Answer 4

From what I can see, the problem here is that the redirect_uri must end with '/' and not contain '?' or other special characters. I think that is why you are getting 'Error validating verification code'. This error only appears if you are using file_get_contents(), and not when using the facebook php library. This is the solution for php, don't know if this error appears in other SDK's.

Answer 5

Struggled with this for a while. Since I didn't want a redirect, but the redirect parameter is required, my solution was to simply set it to nothing -

...&redirect_uri=&client_secret=...

Answer 6

Part of the information given by Aaron Wheeler is incorrect.

It is true that the 'redirect_uri' parameter must be identical in both requests, however it is perfectly possible to URL encode a regular URL and use that as the value for the 'redirect_url' parameter, so long as you're careful to further URL encode any inline URLs.

For instance, you wish facebook to redirect to the following URL:

http://www.mysite.com/Users/oAuthComplete?my_param_1=/Party/pants

Attempting to redirect the user to

'https://www.facebook.com/dialog/oauth?client_id=12345&redirect_uri='
. urlencode('http://www.mysite.com/Users/oAuthComplete?my_param_1=/Party/pants');

Will fail as /Party/Pants creates an invalid URL

However, redirecting to

'https://www.facebook.com/dialog/oauth?client_id=12345&redirect_uri='
.urlencode('http://www.mysite.com/Users/oAuthComplete?my_param_1='
.urlencode('/Party/pants'));

Will work as expected.

If you are using the returned the redrect_uri value in the second, authenticate application request, be sure to url encode again - the value is automatically URL decoded when populating the $_GET superglobal. - This is what tripped me up.

'https://graph.facebook.com/oauth/access_token?client_id=12345&&client_secret=SECRET&code=1234567'
.urlencode('http://www.mysite.com/Users/oAuthComplete?my_param_1='
.urlencode($_GET['my_param_1']));

P.s. In your actual code, I'd recommend using sprintf() rather than chaining string together like in my example, for better readability.