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They are neither VMs or containers, but V8 Isolates. They lacked an API for making outgoing raw TCP connections in the same way that JavaScript running in a browser can’t.

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This used to be an option in Chrome when running in an extension. Sadly sockets were removed in manifest v3.

I was lost about the distinction. This talk really helped: https://www.infoq.com/presentations/cloudflare-v8/

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