URL Issue on Dynamic options via JSON API

The CMS Questions
1 
 authors:
        label: Authors
        type: checkboxes 
        options: http://www.domain.com/api/authors.json
        columns: 5
        required: true

I’m using like above full url http://www.domain.com/api/authors.json and my domain is already domain.com

I have tried following format but didnt work:

options: /api/authors.json
options: api/authors.json

How can i use base url on options as dynamic?

Thanks

2

You have to provide an absolute URL.