Written cache control header is missing on response

1

Hello

I’ve got a service that writes the following header:

Cache-Control: max-age=604800

On the login page (https://rapidhtml.app/login). However, I cannot see the header in my developer tools, nor can I see any caching behaviour.
here’s the dns setup:

CNAME rapidhtml app → rapidhtml-1 onrender com
CNAME www → rapidhtml-1 onrender com

The setup is a simple go service in a docker container. I added a 1s delay for the login page to test whether the page would be cached, but for some reason no matter what I try, I cannot see the cache-control header.

Any idea how can I implement caching with render using cloudfare?

2

HI there,

Looks set to me:

$ curl -sS -D - https://rapidhtml.app/login -o /dev/nullHTTP/2 200date: Tue, 07 May 2024 06:20:11 GMTcontent-type: text/html; charset=utf-8cf-cache-status: DYNAMICcache-control: max-age=604800vary: Accept-Encodingrndr-id: a1322bf8-ad99-4fe0x-render-origin-server: Renderreport-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v4?s=jTSmKMssbmzaRk7nWdkVfnKytsTDFbH%2B66gPtYEADepTcu4cWMo37S%2FvlgTTbRJjdKlqqq0KANPaptM1Ud%2BhQ18WlSaUdoCcPeqCbcRwY%2BUUjrH4Vgomvj%2BTf%2FfZhs67"}],"group":"cf-nel","max_age":604800}nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}server: cloudflarecf-ray: 87ff1a46bc9329ba-MELalt-svc: h3=":443"; ma=86400

Regards,

Keith
Render Support, UTC+10 :australia:

3

It’s set, but I still get DYNAMIC. I think this might be an issue from cloudfare itself, I’m trying to cache dynamic content.

4

Hi there,

This is because all traffic goes through Render’s Cloudflare zone which isn’t cached. To work around this you can implement caching in your Cloudflare zone with a worker which uses the Cache API, you can find an example here: https://developers.cloudflare.com/workers/examples/cache-api/.

Regards,

Keith
Render Support, UTC+10 :australia:

5

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