Facebook App: localhost no longer works as app domain

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The protocol seems to keep changing, and the accepted answer didn’t work for me today. In case it helps other searchers, this is what did work for me:

  • All changes were made on the Settings page under the Basic tab

1.) In the center under the first box of options, click “+ Add Platform” and choose “Website” (or whatever is appropriate for your app.)

2.) In the box that comes up for the website you just added: Site URL: http://localhost:3000/

3.) In the box above that (Settings => Basic): App Domain: localhost

4.) At the bottom right – click “Save Changes”

5.) Make sure you have the app ID copied and pasted correctly into your code. (The ID is in the first box on that page if you need it again.)

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