Not receiving cf-cache-status in the response headers on my cdn worker

Developers Cloudflare Workers
1

For Workers & Pages, what is the name of the domain?

cdn.example.com

What is the issue or error you’re encountering

I have a worker that retrieves images from my R2 bucket. I have assigned a CNAME record (cdn.example.com) to the worker’s domain (and setted Cloudflare as a proxy). When making a request to cdn.example.com, cf-cache-status header does not appear in the response. I also tried creating a cache rule for that hostname, but still nothing.

What are the steps to reproduce the issue?

Make a request to cdn.example.com/image-example.png.

Get the image correctly, but see the following headers:

HTTP/2 200
date: Sat, 24 May 2025 01:28:44 GMT
content-type: image/jpeg
content-length: 1014662
server: cloudflare
vary: Accept-Encoding
cf-ray: 9449049e2b1e0321-MAD
cache-control: public, max-age=31536000
report-to: {“endpoints”:[{“url”:“https://a.nel.cloudflare.com/report/v4?s=%2BY24AYmLZ8Ug8iz%2BFON%2B%2BmDe3UfDXp4UB%2BJGIQoSLy27Uyr3n7dL23tc0X3Uud2ueQXYmeuhMM2W7l4sEMkNkFeL7YJjw48F7cANZ%2Fr8vjeFD3SN6kc2F9BF%2BSfa4dc1wUk%3D”}],“group”:“cf-nel”,“max_age”:604800}
nel: {“success_fraction”:0,“report_to”:“cf-nel”,“max_age”:604800}
alt-svc: h3=“:443”; ma=86400
server-timing: cfL4;desc=“?proto=TCP&rtt=6310&min_rtt=4745&rtt_var=1914&sent=8&recv=10&lost=0&retrans=0&sent_bytes=3498&recv_bytes=2431&delivery_rate=611025&cwnd=230&unsent_bytes=0&cid=52421ab3d8d37864&ts=471&x=0”
X-Firefox-Spdy: h2

This is my worker code:

export default { async fetch(request, env) { try { // Rate limiting const clientIP = request.headers.get('cf-connecting-ip') const rateLimitKey = ratelimit:${clientIP}`

  // Get and increment counter
  const currentRequests = parseInt((await env.KV.get(rateLimitKey)) || '0')
  if (currentRequests > 100) {
    return new Response('Rate limit exceeded', { status: 429 })
  }

  // Set counter with 60 second expiration
  await env.KV.put(rateLimitKey, (currentRequests + 1).toString(), {
    expirationTtl: 60,
  })

  const url = new URL(request.url)
  const path = url.pathname.slice(1)

  const object = await env.MY_BUCKET.get(path)

  if (!object) {
    return new Response('Image not found', { status: 404 })
  }

  const headers = new Headers()
  headers.set('Cache-Control', 'public, max-age=31536000')
  headers.set('Content-Type', object.httpMetadata.contentType || 'image/jpeg')

  return new Response(object.body, {
    headers,
  })
} catch (err) {
  if (!(err instanceof Error)) {
    throw new Error(`Was thrown a non-error: ${err}`)
  }

  console.error('Error serving image:', err)
  return new Response('Error processing image', {
    status: 500,
    headers: {
      'Content-Type': 'text/plain',
    },
  })
}

},
}
`
Can someone help me on what I am doing wrong? First of all, sorry if the solution is simple, I am new to this and still learning, haha

2

Workers run before the CDN cache.

As cf-cache-status is with the CDN cache, that is processed after the Workers, and therefore the CDN cache will never get to act on anything here, when you’re handling things with Workers.

Don’t be, we’ve all been there at some point. :slight_smile:

Many people have over time asked how to cache Workers, and from what I understood, mainly to save on the costs of running them (with the same response) over and over.

The result have always been that you cannot cache Workers, as they run in the traffic sequence before that Cloudflare gets to the CDN cache.

1 Like
3

Well, the solution was indeed simple haha, thanks for the response @DarkDeviL !

1 Like
4

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