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Set cache control headers for functions

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

DX Team
Knowledge Base/CDN
2 min read
Last updated January 8, 2026

By default, the CDN 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.js
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',
    },
  });
}
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.js
export async function GET() {
  return new Response('Cache Control example', {
    status: 200,
    headers: {
      'Cache-Control': 'max-age=3600',
    },
  });
}
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 Cache only.

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

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