Trying to test my FastAPI project in Postman. It automatically generates an OpenAPI spec as a JSON file at http://localhost:8000/openapi.json on my machine. When I try to import this link in Postman, it gets hung up at this screen:

When I press the import button I get no error messages and nothing happens no matter how long I wait. I've verified that the JSON file at that URL is valid by pasting its contents into the "Raw Text" import method, which produces a new Postman collection as soon as I hit the "Import" button.