'Facebook dev settings: Unable to add domain in facebook app settings because of other required parameters

My app is still in development mode and I've been attempting to add localhost to App Domains for development in Basic Settings. This is to allow localhost callbacks for login requests during development.

I've tried without setting this but facebook shows me a message explicitly saying that I have to set the App Domains field.

But then, the other fields, namely Privacy Policy URL and User data deletion start showing parameter required error and can't seem to save save changes because of this. This is stupid. Do I really have to setup a hosting and have some kind of placeholder pages before I can even start development?



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