worth noting concurrent builds is just if you're using Cloudflare's built in builders and such. If y

worth noting concurrent builds is just if you're using Cloudflare's built in builders and such. If you're using drag and drop/direct upload/uploading the files via the API, both the concurrent build limit and the builds per month limit do not apply

CChaika worth noting concurrent builds is just if you're using Cloudflare's built in bui...

VinnieDePikvis•5/26/25, 4:18 PM

so my current situation is that I need to host my NextJS sites, so are you saying that if I build them using cloudflare-on-next npm package and just make cloudflare host those its free?

VVinnieDePikvis so my current situation is that I need to host my NextJS sites, so are you sayin...

ChaikaOP•5/26/25, 4:22 PM

If you build them locally and upload the files you can avoid the build limits and such
Worth noting next-on-pages for example uses Functions to handle all the routing, and you'd be either limited by the Functions free tier or have to pay as part of Workers Paid
Only truly static sites/assets are free and unlimited requests

CChaika If you build them locally and upload the files you can avoid the build limits an...

VinnieDePikvis•5/26/25, 4:24 PM

hmm, well I can't make them static but thanks, 'ppreciate it

CChaika That's confused me before, I think you're right There is now a compat flag whic...

dave•5/26/25, 4:28 PM

What is the downside of using this flag? It seems like it should be a default, what would it break…?

Ddave What is the downside of using this flag? It seems like it should be a default, w...

ChaikaOP•5/26/25, 4:29 PM

It would break every worker on a route fetching through to the origin

ChaikaOP•5/26/25, 4:30 PM

or any worker depending on it not being challenged/blocked. I have an Astro SSR site which fetches the API on the same zone, wouldn't want it being challenged or blocked in anyway

CChaika It would break every worker on a route fetching through to the origin

dave•5/26/25, 4:30 PM

ahhh, I think I have almost zero Workers do that do that pattern.

ChaikaOP•5/26/25, 4:31 PM

yea I think it's kind of rarer these days, was like the #1 use case when Workers first launched though, and still a good example/use

CChaika It would break every worker on a route fetching through to the origin

dave•5/26/25, 4:40 PM

How does the flag interact with service bindings?

Ddave How does the flag interact with service bindings?

ChaikaOP•5/26/25, 4:42 PM

in what way? I would assume this changes nothing with calling/fetching them since that's all seperate and magical, I haven't tested though

CChaika in what way? I would assume this changes nothing with calling/fetching them sinc...

dave•5/26/25, 4:43 PM

like if it would change any behaviour at all.

I think you're right that it's all seperate and doesn't impact, but yeah I don't know 100%.

dave•5/26/25, 10:56 PM

How is it possible that I exceeded the CPU time with only 11ms?

Walshy•5/26/25, 11:13 PM

Cron triggers have a wall time limit, you exceeded that

Walshy•5/26/25, 11:13 PM

(The reporting for that isn't great I know - sorry for that)

Walshy•5/26/25, 11:15 PM

https://developers.cloudflare.com/workers/platform/limits/#worker-limits

WWalshy (The reporting for that isn't great I know - sorry for that)

dave•5/26/25, 11:19 PM

ah yeah it's just the reporting that's the issue

Trojan•5/27/25, 12:48 PM

Is it beneficial to ping workers at the beginning of a request to “pre-warm” them if you know you’ll make requests to them?

WWalshy Cron triggers have a wall time limit, you exceeded that

dave•5/27/25, 1:21 PM

Why do normal Workers have no limit, but Cron Workers do? Feels backwards.

Walshy•5/27/25, 1:22 PM

well, cron triggers are a bit different than normal invocations. don't really want to run a worker every minute and let it run for 6 hours

TTrojan Is it beneficial to ping workers at the beginning of a request to “pre-warm” the...

dave•5/27/25, 1:22 PM

Workers are so fast that I don’t really see a need to do that. The max startup time is 400ms, so I think you’d always be looking at <1 second at worst for a cold start.

WWalshy well, cron triggers are a bit different than normal invocations. don't really wa...

dave•5/27/25, 1:22 PM

That’s exactly what I want though.

Walshy•5/27/25, 1:22 PM

also we already pre-warm https://blog.cloudflare.com/eliminating-cold-starts-with-cloudflare-workers/

Ddave That’s exactly what I want though. 😅

Walshy•5/27/25, 1:23 PM

haha, then your best bet is DO Alarms

WWalshy also we already pre-warm <https://blog.cloudflare.com/eliminating-cold-starts-wi...

dave•5/27/25, 1:24 PM

For now, this is only available for Workers that are deployed to a “root” hostname like “example.com” and not specific paths like “example.com/path/to/something.” We plan to introduce more optimizations in the future that can preload specific paths.

Is this still the case, or did that optimization land for custom routes (i.e. non-custom domain routes)?

WWalshy haha, then your best bet is DO Alarms

dave•5/27/25, 1:25 PM

A Worker can have up to three Cron Triggers configured at once

https://developers.cloudflare.com/durable-objects/api/alarms/#background

I’m like 75% sure this is wrong, since I use waaaaay more than three Cron schedules in many of my Workers.

Cloudflare Docs

Alarms

Durable Objects alarms allow you to schedule the Durable Object to be woken up at a time in the future. When the alarm's scheduled time comes, the alarm() handler method will be called. Alarms are modified using the Storage API, and alarm operations follow the same rules as other storage operations.

Ddave > For now, this is only available for Workers that are deployed to a “root” host...

Walshy•5/27/25, 1:28 PM

still root, it's hard to figure out the right path early

WWalshy also we already pre-warm <https://blog.cloudflare.com/eliminating-cold-starts-wi...

Trojan•5/27/25, 1:28 PM

how about for subrequests? those can’t be known ahead of time right?

Ddave > A Worker can have up to three Cron Triggers configured at once https://develo...

Walshy•5/27/25, 1:29 PM

hmm yeah, i think the limit is like 10/15

TTrojan how about for subrequests? those can’t be known ahead of time right?

Walshy•5/27/25, 1:29 PM

no, this doesn't help subrequests

Walshy•5/27/25, 1:29 PM

but also worth noting that workers are fast anyway :)

Trojan•5/27/25, 1:29 PM

maybe premature optimization, but fun to think about

Trojan•5/27/25, 1:31 PM

what’s the wind down period? maybe i can time prewarming by a kv value

Walshy•5/27/25, 1:31 PM

also worth remembering that workers don't shut down right away

Walshy•5/27/25, 1:31 PM

they stay around for a while (there is no set duration)

Trojan•5/27/25, 1:32 PM

ahhh darn

WWalshy also worth remembering that workers don't shut down right away

dave•5/27/25, 1:43 PM

Are you allowed to do a fetch with FinalizationRegistry? Was thinking you could make a Worker fetch itself as soon as it's being cleaned up.

https://developers.cloudflare.com/workers/configuration/compatibility-flags/#enable-finalizationregistry-and-weakref

Walshy•5/27/25, 1:44 PM

FinalizationRegistry is only on gc cleanup, i don't know if you'll be able to get that reliably on worker shut down - i doubt it

Walshy•5/27/25, 1:45 PM

i'm not aware of it blocking fetch though so you can try it

Ddave Are you allowed to do a fetch with FinalizationRegistry? Was thinking you could ...

Trojan•5/27/25, 2:04 PM

that’s terrifying lol

Trojan•5/27/25, 2:07 PM

how about regional durable object replicas which ping their counterparts on the opposite side of the globe to stay warmed and consume wall time over cpu time

Trojan•5/27/25, 2:07 PM

well i guess you can’t concretely set their placement

GilDev•5/27/25, 3:49 PM

Hi!
Is there a way to rate-limit my Worker so that requests are not even counted by Cloudflare toward my daily request limit? It seems like the rate limit API only limits inside the Worker, but the initial call will still increment the request counter, right?

GGilDev Hi! Is there a way to rate-limit my Worker so that requests are not even counted...

ChaikaOP•5/27/25, 4:05 PM

yes, rate limit rules and using Worker Custom Domains

ChaikaOP•5/27/25, 4:06 PM

https://developers.cloudflare.com/waf/rate-limiting-rules/

Cloudflare Docs

Rate limiting rules

Rate limiting rules allow you to define rate limits for requests matching an expression, and the action to perform when those rate limits are reached.