AWS App runner and Prometheus Integration (404 Error)

While using the app runner domain as target in Prometheus we are getting a 404 error as our app runner URL is but the url is changing to due to this getting a 404 not found error and state is DOWN.
Need a solution to scrape this https default 443 port so i can use my actual app runner domain without the port in Prometheus.
I added the scheme as https as well. Do i need to config any certificates for Prometheus and aws app runner ?