Hello, I am attempting to use `fetch`

Hello, I am attempting to use

fetch

fetch

with the

cf.cacheTtlByStatus

cf.cacheTtlByStatus

cf.cacheTtlByStatus

cf.cacheTtlByStatus and

cf.cacheEverything

cf.cacheEverything

cf.cacheEverything

cf.cacheEverything options and during development I plan to make a request from Worker A to Worker B both running in separate instances of wrangler so I'm wondering - will wrangler

fetch

fetch

do any caching during development? Also, will I need to enable Tiered Cache on Worker A or WorkerB's domain (or both) for this to work in production?

JustWayneOP•12/1/25, 4:21 PM

During development my request will go from Worker A running on localhost:23050 to Worker B running on localhost:24020 but during production the fetch will go from Worker A on domain-a.com to Worker B on domain-b.com

Tanmay Kapoor•12/1/25, 5:07 PM

Hello @Dario , we missed this one. Tagging you so we don't miss out. Thanks for your support!

Dario•12/1/25, 5:17 PM

mh.... I don't think that service binding calls between workers are cached neither in local dev nor in production, or am I wrong? did you see this working in production?

JustWayneOP•12/1/25, 5:46 PM

@Dario It's documented here - https://developers.cloudflare.com/workers/examples/cache-using-fetch/

Cloudflare Docs

Cache using fetch

Determine how to cache a resource by setting TTLs, custom cache keys, and cache headers in a fetch request.

JustWayneOP•12/1/25, 5:47 PM

I am not sure if I need to enable Tiered Caching on the domain of Worker A or Worker B in order for this to work.

JustWayneOP•12/1/25, 5:47 PM

Oh, yeah I'm not using a service binding. I'm using

fetch

fetch

to fetch from a domain hosted by Worker B

Dario•12/1/25, 5:48 PM

ahhhhhh I see, you are bypassing the workers limitations by having them hosted on different domains ð¤

JustWayneOP•12/1/25, 5:50 PM

This scenario of making a request to a "domain hosted by Cloudflare" using fetch to take advantage of the tiered caching is clearly outlined somewhere as a standard example but I'm having trouble finding it rn

Dario•12/1/25, 5:51 PM

oh I see ð

mh....

JustWayneOP•12/1/25, 5:51 PM

Here it is - https://developers.cloudflare.com/workers/reference/how-the-cache-works/#fetch

Cloudflare Docs

How the Cache works

How Workers interacts with the Cloudflare cache.

Dario•12/1/25, 5:51 PM

any idea @Walshy ?

JustWayneOP•12/1/25, 5:53 PM

it says:

Otherwise, it reads through its own zoneâs cache, even if the URL is for a non-Cloudflare site. Cache settings on fetch automatically apply caching rules based on your Cloudflare settings.

When I asked ChatGPT & Claude about this they weren't sure if I needed to enable any settings for a call to

fetch

fetch

to cache something according to the cfcf cache options that I pass e.g. cacheTtlByStatuscacheTtlByStatus

JustWayneOP•12/1/25, 5:54 PM

Thanks for your help - no problem, I'll test it in a live environment soon to figure out what to do if I don't hear back from you

Dario•12/1/25, 5:58 PM

oh ok I see, sorry I wasn't of much help ð

Please give it a try and let us know how it goes ð

If you do need to enabled teared caching on etheir zone please consider opening a PR to clarify this in the docs ð ð

Hello, I am attempting to use `fetch`

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