This ReadableStream did not return bytes.

I'm doing something like this with nuxt/nitro:

export default defineEventHandler(async (event) => {

    setResponseHeader(event, "Content-Type", "text/event-stream");
    setResponseHeader(event, "Cache-Control", "no-cache");
    setResponseHeader(event, "Transfer-Encoding", "chunked");

    const stream = new ReadableStream({
        async start(controller) {
            controller.enqueue(JSON.stringify({ type: 'message', role:"user", content:"HELLO" }) + '\n')
            controller.close()
        }
    })

    return stream
})

export default defineEventHandler(async (event) => {

    setResponseHeader(event, "Content-Type", "text/event-stream");
    setResponseHeader(event, "Cache-Control", "no-cache");
    setResponseHeader(event, "Transfer-Encoding", "chunked");

    const stream = new ReadableStream({
        async start(controller) {
            controller.enqueue(JSON.stringify({ type: 'message', role:"user", content:"HELLO" }) + '\n')
            controller.close()
        }
    })

    return stream
})

My POST requests return nothing and the logs show: This ReadableStream did not return bytes. - Works fine in localhost. Does anyone knows what could cause the issue?

1 Reply

cosbgnOP•4mo ago

If someone finds this, the trick is to use textEncoder.encode if you don't it works locally but not on workers:

controller.enqueue(textEncoder.encode(JSON.stringify(json) + delimiter))

controller.enqueue(textEncoder.encode(JSON.stringify(json) + delimiter))

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This ReadableStream did not return bytes.

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