> ## Documentation Index
> Fetch the complete documentation index at: https://bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Configure TLS on an HTTP server

Set the `tls` key to configure TLS. Both `key` and `cert` are required. The `key` should be the contents of your private key; `cert` should be the contents of your issued certificate. Use [`Bun.file()`](/runtime/file-io#reading-files-bun-file) to read the contents.

```ts server.ts icon="https://mintcdn.com/bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization/irnPaIf5BInKUovc/icons/typescript.svg?fit=max&auto=format&n=irnPaIf5BInKUovc&q=85&s=749f5ca3fc8733d63266eddb19569000" theme={null}
const server = Bun.serve({
  fetch: request => new Response("Welcome to Bun!"),
  tls: {
    cert: Bun.file("cert.pem"),
    key: Bun.file("key.pem"),
  },
});
```

***

By default Bun trusts the default Mozilla-curated list of well-known root CAs. To override this list, pass an array of certificates as `ca`.

```ts server.ts icon="https://mintcdn.com/bun-1dd33a4e-farm-dc5e99a7-serve-route-target-normalization/irnPaIf5BInKUovc/icons/typescript.svg?fit=max&auto=format&n=irnPaIf5BInKUovc&q=85&s=749f5ca3fc8733d63266eddb19569000" theme={null}
const server = Bun.serve({
  fetch: request => new Response("Welcome to Bun!"),
  tls: {
    cert: Bun.file("cert.pem"),
    key: Bun.file("key.pem"),
    ca: [Bun.file("ca1.pem"), Bun.file("ca2.pem")],
  },
});
```


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