Signals Data Factory - Error 403 Forbidden when using API calls

Problem

After a 3.3 upgrade the SDF API calls will fail with error 403

Signals Data Factory using the REST API and the endpoint /job-service/projects/{project number}/add-file, but the request is being denied with a status code 403 Forbidden.

Solution

Require the User-Agent tag to be added to the HTTP header in order to bypass the error and complete the POST action