Websockets with Workers

Howdy y'all! I have a worker that is functioning as a websocket server. Everything works fantastically:

locally / in dev
in production if I use a CLI to interact

The second I wire up a browser to it, things start failing though. And what's worse, the failing has almost no details anywhere that I can find. The connection succeeds and then immediately closes. No logs on the backend, and logs on the frontend are code 1006 ("i dunno what happened").

Has anyone seen this before? Any ideas where to dig in? It feels like either browser security (no luck on making CORS permissive) or something strange Cloudflare is doing.

Ccole Howdy y'all! I have a worker that is functioning as a websocket server. Everythi...

danim47c•2/21/25, 6:03 PM

Hello, are you using Hono in the worker?

coleOP•2/21/25, 9:06 PM

Indeed! I ended up chasing it down - there was some error handling code that was firing at the wrong time and closing the connection in my frontend

Yeah, I want those hours back haha

Ccole Howdy y'all! I have a worker that is functioning as a websocket server. Everythi...

Avilaa•2/22/25, 2:03 AM

bro can you tell me how do i use websockets with workers? or any guide that you used? please

hunt•2/22/25, 3:20 AM

https://developers.cloudflare.com/durable-objects/examples/websocket-hibernation-server/

Cloudflare Docs

Build a WebSocket server with WebSocket Hibernation · Cloudflare Du...

Build a WebSocket server using WebSocket Hibernation on Durable Objects and Workers.

AAvilaa bro can you tell me how do i use websockets with workers? or any guide that you ...

coleOP•2/22/25, 1:16 PM

I did things a little differently than that article hunt references.

Hope it helps!

https://www.analogous.dev/blog/websockets-and-cloudflare-workers

Websockets and Cloudflare Workers - analogous.dev

Websockets and Workers! A match made in heaven! Or not. Stateful, persistent communication? With ephemeral, floaty web workers that have almost no state? How in the world can those interoperate!? Leave it to the talented folks at Cloudflare to build a fantastic integration. This is ...

Ccole I did things a little differently than that article hunt references. Hope it h...

Avilaa•2/22/25, 1:19 PM

bro, I already said, do you know what the prices are for websockets without durable objects?

coleOP•2/22/25, 1:35 PM

Sorry, didn't see that message, and don't know yet. I should be able to tell you in about a month though haha.

Ccole Sorry, didn't see that message, and don't know yet. I should be able to tell you...

Avilaa•2/23/25, 8:49 AM

jajajaj lmao

vijayaraagavan•9/8/25, 2:08 PM

@cole @Avilaa I have the same question. Do you know if Workers (without Durable Objects) are billed for full WebSocket duration, or just the initial request + cpu time used?

Websockets with Workers

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