← Back to Guides

Learn how to set headers to cache your function's responses.

By default, the Edge Network and browser will not cache, unless you set the following headers in your function as needed: Cache-Control,CDN-Cache-Control, and Vercel-CDN-Cache-Contol. You can set these headers to:

Setting the cache in functions takes priority over config files.

app/api/cache-control-headers/route.ts
export async function GET() {
  return new Response('Cache Control example', {
    status: 200,
    headers: {
      'Cache-Control': 'max-age=10',
      'CDN-Cache-Control': 'max-age=60',
      'Vercel-CDN-Cache-Control': 'max-age=3600',
    },
  });
}

Vercel uses the following priority when you specify multiple cache control headers:

  • Vercel-CDN-Cache-Control
  • CDN-Cache-Control
  • Cache-Control

This sets the same maximum cache duration for Vercel, CDNs, and the client:

app/api/cache-control-headers/route.ts
export async function GET() {
  return new Response('Cache Control example', {
    status: 200,
    headers: {
      'Cache-Control': 'max-age=3600',
    },
  });
}

This sets the maximum cache duration for Vercel's Edge Cache only.

app/api/cache-control-headers/route.ts
export async function GET() {
  return new Response('Cache Control example', {
    status: 200,
    headers: {
      'Vercel-CDN-Cache-Control': 'max-age=3600',
    },
  });
}

This sets the cache duration on Vercel and also on other CDNs

app/api/cache-control-headers/route.ts
export async function GET() {
  return new Response('Cache Control example', {
    status: 200,
    headers: {
      'CDN-Cache-Control': 'max-age=60',
    },
  });
}

Last updated on June 21, 2024