REST API – Retrieving posts with custom status

Yes, authentication is needed, because the Posts endpoint will check whether the current user has the edit_posts capabilitysee WP_REST_Posts_Controller::sanitize_post_statuses(). Also, a HTTP status of 401 normally indicates that authentication is required.

So try again, but with an authenticated request, i.e. make sure the current user is logged-in and has the edit_posts capability.

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