Option to add cache-control headers to pages with automatic static optimization when using next start

[flybayer]

Describe the feature you'd like to request

Currently pages that are automatically statically optimized (no getServerSideProps or getStaticProps or getInitialProps) do not have any cache-control header set when served via next start.

This causes a slow down for all users of apps using next start because these static pages cannot be served from a CDN. Additionally it causes additional server load.

I want these pages to be automatically cached by any CDN in front of it.

Describe the solution you'd like

I want a way to enable cache-control headers for auto static pages via next.config.js.

It could be a single flag like

module.exports = {
  automaticStaticOptimizationCacheControl: true | false | 's-max-age=36000'
}

Or potentially using the headers array with a special source.

const config = require('next/config')

module.exports = {
  async headers() {
    return [
      {
        source: config.AUTOMATIC_STATIC_OPTIMIZATION,
        headers: [
          {
            key: 'Cache-control',
            value: 's-max-age=36000',
          },
        ],
      }
    ]
  },
}

And ideally we could enable it with an environment variable like NEXT_ENABLE_STATIC_OPTIMIZATION_CACHE_CONTROL

Describe alternatives you've considered

I don't see any other alternatives besides manually configuring the CDN to cache specific pages or by using a custom server. Because the docs say "You cannot set Cache-Control headers in next.config.js"

[vivek7405]

It would be great if static pages can be auto served via CDN!

[AdamZaczek]

Our users are stuck forever on old versions of the app.
How can this be an intended behavior?
This is insanity. Vercel team, please take a look into this.

[Axxxx0n]

adding to that, static files from public dir have cache-control: public, max-age=0 which is also bypassing cache.

[balazsorban44]

Converted to a discussion as per our Triaging policy. This does not mean that the discussion got closed, feel free to discuss further!

[leerob]

It's now possible to customize cache-control as of v14.2.10. Please upgrade and give it a try!

#69802