How can I add localhost:3000 to Facebook App for development

Question

I am working on a Rails 4 app. On my laptop, development is done at localhost:3000. The actual domain of the site is roomidex.com.

How can

Answer 1

Your error is saying

localhost URL is not allowed in the application

I know, FB does not give a s**t about explaining, what do to in those moments, however, as far as I am concerned, I have found workaround.

Basically, you need to "whitelist" locahost url in your app

Here is what you are going to do

1. Go to the app edit/summary page
2. In the fourth field App Domains, you should already have roomidex.com, so add another address localhost
3. The urls mentioned above are only valid, if each one of them is put into tabs, where you set, how you app integrates with Facebook (website with facebook login, App on facebook, Mobile web, …)
4. I do this: I put my working URL, in your case roomidex.com into Website with facebook login, and my test, localhost URL, either into App on facebook or Page tab