Why Claude.ai Streams Its Answers Over POST (and How I Reused the Trick Without EventSource)
Open devtools on claude.ai and its streaming answers arrive over a POST request — which the browser's EventSource can't read, since it only does GET. I unpack why this one-request streaming pattern is so convenient, then rebuild it from scratch: a Bun server that returns text/event-stream, plus a 15-line client that parses SSE frames with fetch + TextDecoderStream. The demo is a travel assistant where the LLM is just one link in the chain, not the whole show.
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