How to return response headers with a page?

[pulsar spruce]

How do I set response headers e.g cache control for a SSR route? The page is currently being rendered upon each request.

[vale ginkgo]

like this https://github.com/TanStack/tanstack.com/blob/b2ce75753b4c4dcc1b8ea4c2ba4d588b52bb69c5/src/routes/%24libraryId/%24version.docs.tsx#L36