why do I get “Invalid appsecret_proof provided in the API argument”

Question

Since the latest change on Facebook, regarding the appsecret_proof: https://developers.facebook.com/docs/reference/api/securing-graph-api/, we are still unable to download p

Answer 1

If this error is unexpected behavior, you may have checked a setting in your app to require it. Uncheck it and you should stop getting that error. That setting is in settings -> advanced and is called "App Secret Proof for Server API calls". Set that to NO.

As of now, that setting is on this page (make sure to put your appId in the URL): https://developers.facebook.com/apps/YOUR-APP-ID/settings/advanced/

Note this is not a universal solution, only a solution for people who don't want that behavior.