Question

FB.init() docs state that you can pass some mysterious authResponse param to it which is Object also retrievable by getAuthResponse. What does it do exactly?

Answer 1

Good question. Though FB’s documentation is sparse in this matter, a blog post explains what’s happening. Once oauth is enabled in the FB.init, the FB.login will respond with a response object that contains the authResponse, which can apparently stored by the application and installed when you the FB.init in the succeeding application-accesses.

Specifically, I am quoting from the same post :

As with sessions, an authorization record can be installed when
FB.init is called by including an authResponse parameter and attaching
it to a valid authorization response for the logged in user. Whereas
many developers would store sessions in a database, you might now
store authorization responses instead.