How to access HTTPS certificate and key in App Platform?

My app is using fastify. I recently upgraded to fastify v4 and I’m getting the error “self signed certificate in certificate chain”.

It seems I need to configure the key and the cert for the server, as documented here

As I understand App Platform obtains and renews the cert automatically, How can I access the key and certificate?


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February 26, 2023

Hey @tslocke,

According to the App Platform documentation, you can only enable HTTPS for custom domains, and not for the default app platform 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.

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.

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