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Hey @tslocke,
According to the App Platform documentation, you can only enable HTTPS for custom domains, and not for the default app platform domain (your-app.ondigitalocean.app).
https://docs.digitalocean.com/products/app-platform/quickstart/#register-a-custom-domain
If you want to enable HTTPS for your app, you will need to add a custom domain, and then add an SSL certificate for that domain.
https://docs.digitalocean.com/products/networking/load-balancers/how-to/manage/#ssl
According to the Fastify documentation, in order to enable HTTPS/HTTP2, you will need to specify the key and cert files in the options object when initializing the Fastify server.