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In cloudflare workers we can create websockets as mentioned this blog post https://blog.cloudflare.com/introducing-websockets-in-workers/ but I tried to send message back to browser from server to specific client, I couldn't. I wonder how we can make something like that https://stackoverflow.com/a/17223609/9532712 with cloudflare workers.

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You'll need to use a Durable Object: https://developers.cloudflare.com/workers/learning/using-durable-objects#websockets-in-durable-objects

Brett
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  • Not true, you can call server.send : https://developers.cloudflare.com/workers/runtime-apis/websockets – jjxtra Jan 17 '22 at 22:13