Am I correct to assume that MessageChannel API is safe way to send events between different requests

Am I correct to assume that MessageChannel API is safe way to send events between different requests the worker is handling? For example letting 2 websocket clients that hit the same worker isolate talk to eachother is now possible? I kind of did something like this before but by polling a global value

(circumventing the "Cannot perform I/O on behalf of a different request." error)

BBigFungus We are trying to setup a 24/7 realtime dashboard with workers that receive ~5 me...

1984 Ford Laser•10/31/25, 7:56 PM

SSE will be more expensive than Durable Objects with Hibernating WebSockets

Ggeg Am I correct to assume that MessageChannel API is safe way to send events betwee...

Isaac McFadyen•10/31/25, 7:58 PM

I believe it's request-scoped.

IIsaac McFadyen I believe it's request-scoped.

gegOP•10/31/25, 7:58 PM

I just tried it out and seems to work out, just asking here to be sure it's okay for future

Ggeg I just tried it out and seems to work out, just asking here to be sure it's okay...

Isaac McFadyen•10/31/25, 7:59 PM

Oh I see, if it works then it's probably fine to rely on

Isaac McFadyen•10/31/25, 7:59 PM

Keep in mind that there is absolutely 0 guarantees you'll hit the same datacenter or even that there won't be multiple copies of a Worker running in a datacenter.

Tito•11/1/25, 1:26 AM

is there a place for suggestions? if not, can we please allow more than 50 api keys or have it not on by default when creating a worker :3

TTito is there a place for suggestions? if not, can we please allow more than 50 api k...

texan•11/1/25, 2:19 AM

#workers-and-pages-feature-suggestions

Ttexan #workers-and-pages-feature-suggestions

Tito•11/1/25, 2:27 AM

ty will :CoolCat: also surprised you ain't on here (https://who-to-bother-at.com/cloudflare) same w/ Walshy

unless you not on X

texan•11/1/25, 2:28 AM

I’m definitely hit and miss on activeness in discord. But yeah also no twitter for me, and not even in the same ballpark as many of the CF folks here!

11984 Ford Laser SSE will be more expensive than Durable Objects with Hibernating WebSockets

BigFungus•11/1/25, 5:00 PM

Oh right I forgot about hibernating websockets thanks you saved us a lot of Dev time

! priyansh ★•11/1/25, 5:58 PM

is there any good resource to learn about cloudflare workers

! priyansh ★•11/1/25, 5:58 PM

as i want to implement wildcard subdomains for my project

!! priyansh ★as i want to implement wildcard subdomains for my project

Hello, I’m Allie!•11/1/25, 6:19 PM

https://developers.cloudflare.com/workers

Cloudflare Docs

Cloudflare Workers

With Cloudflare Workers, you can expect to:

jumanji•11/1/25, 6:57 PM

Guys how to purge page cash data because its display old site

Tito•11/1/25, 11:33 PM

currently running like 4 cf mcp server's is there a way it doesn't need to just load up all the auth's up? seems to happen like once every few hours.

! priyansh ★•11/2/25, 1:42 PM

is this possibe to route all subdomains of a domain to the worker which has no dns records?
i tried but it is also routing all non records subdomains and also proxied subdomains

Sebastian Long•11/2/25, 4:17 PM

Hello! I'm having a problem with functions, I'm trying to create a webapp that use function to connect to D1 but when I do a post to the function it fails with 404

-----•11/3/25, 5:01 PM

Hello, is it possible to use WASM (Web Assembly) on cloudflare pages?

1984 Ford Laser•11/4/25, 1:17 AM

What are people's email sending service of choice to use with Workers? I know the closed beta of the new email product is coming this month, but don't wanna wait around too long for access. I will be sending around 100 emails a week, and the addresses will always be from the same set of users more or less (would prefer to not need a manual confirmation from users to be allowed to accept email from service). No plans to scale higher, so something with a free tier or something is best. The content will be a templated HTML or something similar depending what the service requires

------Hello, is it possible to use WASM (Web Assembly) on cloudflare pages?

1984 Ford Laser•11/4/25, 4:22 AM

This might be of interest
pages-discussions

Dubz•11/4/25, 4:35 AM

idk if this is new or I'm just blind, but whomever added this here, THANK YOU!

Dubz•11/4/25, 5:31 AM

I changed my cron to run every 5 minutes but it won't run now despite showing the correct "next run time" :NotLikeThis:

Dubz•11/4/25, 5:32 AM

ofc now it is lmao nvm

Dubz•11/4/25, 6:25 AM

Building tomorrow :dogekek:
(my computer time syncs with time.cloudflare.com so idk lmao)

DDubz Building tomorrow :dogekek: (my computer time syncs with time.cloudflare.com so ...

1984 Ford Laser•11/4/25, 9:18 AM

There was just a discussion in #off-topic about the CF NTP servers not being great

11984 Ford Laser There was just a discussion in #off-topic about the CF NTP servers not being gre...

Dubz•11/4/25, 9:30 AM

ah, good call. thanks lol

1984 Ford Laser•11/4/25, 10:16 AM

Would it be against ToS to ingest a video stream (fMP4) from Stream using a DO and something like mp4box, then send the video frames as bytes over WebSockets to listening clients and then the clients re-create the streams using Media Source Extensions?

11984 Ford Laser This might be of interest https://discord.com/channels/595317990191398933/789155...

-----•11/4/25, 1:42 PM

Is it with workers?

-----•11/4/25, 1:42 PM

or can i just deploy .wasm files to pages

Asutosh Panda•11/4/25, 2:15 PM

hey folks, new to the cf platform
have deployed a few static sites on the pages
but now when I tried to deploy something more, getting a bunch of errors
the app is in nextjs, fetches real estate info from a google sheet

so far tried to use edge runtime, nothing was on the depoyed URL
api routes work fine in local but becomes messy when I use functions, nothing loads on the app

used this guide - https://developers.cloudflare.com/workers/framework-guides/web-apps/nextjs/#deploy-an-existing-nextjs-project-on-workers
no luck with this as well, have been trying in local, the preview or run dev commands dont bring up the app in the respeactive port
shared the screenshot with project structure and errors as well

what else is missing or going wrong here, can anyone please help out to make this work with wrangler locally, then I will jump to the deployed one
please let me know what else do I need to share to give more context

Asutosh Panda•11/4/25, 2:16 PM

dave•11/4/25, 9:01 PM

After removing my * * * * ** * * * * cron schedule several minutes ago, I see it's still being trigger..

dave•11/4/25, 9:01 PM

is there an outage or something?

Ddave After removing my `* * * * *` cron schedule several minutes ago, I see it's stil...

Hard@Work•11/4/25, 9:03 PM

IIRC cron updates take a bit of time to propagate

Hard@Work•11/4/25, 9:04 PM

Specifically adding/removing

Isaac McFadyen•11/4/25, 9:05 PM

I believe there is a cron for the cron Worker updates (yes actually) :lul:

Chaika•11/4/25, 9:06 PM

Changes such as adding a new Cron Trigger, updating an old Cron Trigger, or deleting a Cron Trigger may take several minutes (up to 15 minutes) to propagate to the Cloudflare global network.

CCelestial Rose hey ! this is kind of a n00b question but asking anyway 😂 i am using caches.def...

Celestial Rose•11/4/25, 10:03 PM

whoops confused workflows and workers channels, x-posting here

Dubz•11/5/25, 12:31 AM

Is there a way to limit build run time for deployments? Sometimes mine glitches and runs endlessly but usually only takes around 30-40 seconds to complete.

11984 Ford Laser There was just a discussion in #off-topic about the CF NTP servers not being gre...

Dubz•11/5/25, 8:37 AM

apparently I was using time.cloudflare..comtime.cloudflare..com this entire time

George Clasher•11/5/25, 8:43 AM

Can I keep my cf worker sleep 180 seconds and then send response, I have paid plan

Dubz•11/5/25, 8:54 AM

Also apparently Windows 11 just isn't working with NTP sync. Also having DNS service dropping randomly for this computer. Idk just all around screwy. So I guess it's all on my end after all lmao.

Fixed that, had to re-register the w32tm service apparently even though it was acting normal otherwise. Good ol' Windows ig.

stavros-k•11/5/25, 11:55 AM

Hi!
I'm trying to increase the project (pages) limits (100). Tried both the form and opening a general-help thread general-helpProject limit increase but I've got no response for a while. What are my options?

Thanks

TK•11/5/25, 1:08 PM

Hey folks, we're doing a little discovery on local debugging with local resources/bindings when building with wrangler, and looking for some feedback. If you've previously posted feedback on this kind of idea please link it to me in the thread I am sorry I haven't been here that long!

Do you ever have challenges with this? What do you typically do to check the state of your locally emulated CF resources when developing/seeding/resetting around stateful stuff. This would be using tools like D1, R2, DOs or KV, and having a local version of your application without using remote: trueremote: true.

Recently we came across this VS Code extension that allows you to view KV data locally. Has anyone tried this or tools that do similar jobs for D1 or other resources, I can think of a couple! (Here's the extension https://marketplace.windsurf.com/vscode/item?itemName=swalkerdev.cloudflare-kv-explorer)

I'd love to hear what's working, what's not working, what tools you've tried, and especially any specific challenges you have had in this space. Starting a thread

rikka0w0•11/5/25, 3:38 PM

According to the document, calling ctx.waitUntil will keep the worker alive for 30s(wall clock) until the given promise resolves.

My question is, if I return a ReadableStream in the fetch event, can I extend the worker life time (wall clock) more than 30s by calling ctx.waitUntil multiple times?

Rrikka0w0 According to the document, calling ctx.waitUntil will keep the worker alive for ...

Hello, I’m Allie!•11/5/25, 3:45 PM

No, you get 30 seconds irrespective of how many times you call it

Chaika•11/5/25, 3:45 PM

?crossposting -> calling ctx.waitUntil multiple times

SuperHelpflare•11/5/25, 3:45 PM

Please do not post your question in multiple channels/post it multiple times per the rules at #

welcome-and-rules. It creates confusion for people trying to help you and doesn't get your issue or question solved any faster.

Am I correct to assume that MessageChannel API is safe way to send events between different requests

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