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I’ve never understood the use of SSE over ndjson. Builtin browser support for SSE might be nice, but it seems fairly easy to handle ndjson? For non-browser consumers ndjson is almost assuredly easier to handle. ndjson works over any transport from HTTP/0.9 to HTTP/3 to raw TCP or unix sockets or any reliable transport protocol.

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Manually streaming a XHR and parsing the messages is significantly more work, and you lose the built-in browser API. But if you use a fetch ReadableStream with TLV messages I'm sold.

Here's SSE with fetch and streams https://github.com/rexxars/eventsource-client

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