Question

According to add to page documentation you should be able to add an app to a page via a URL. The documentation lists two ways of defining the redirect URL next and redirect_uri

I have tried creating the URL using both methods but get redirected to a Facebook error page from both of them which states:

Sorry, something went wrong. We’re working on getting this fixed as
soon as we can.

Is there something wrong with how I am creating the URL?

string.Format("https://www.facebook.com/dialog/page?app_id={0}&display=popup&redirect_uri={1}", appId, HttpUtility.UrlEncode(redirectURL));

and

string.Format("https://www.facebook.com/dialog/page?app_id={0}&display=popup&next={1}", appId, HttpUtility.UrlEncode(redirectURL));

UPDATE: It does work via the JavaScript SDK. Any reason why the link I am trying to generate above aren’t working?

Answer 1

• if you are not using the JS-SDK, you should specify the redirect_uri. Most likely the next parameter is from an old implementation and no longer in use.
• you are calling the wrong endpoint /dialog/page, it should be /dialog/pagetab:

Example:

string.Format("https://www.facebook.com/dialog/pagetab?app_id={0}&display=popup&redirect_uri={1}", appId, HttpUtility.UrlEncode(redirectURL));