/fetch-with-progress.js Secret
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May 9, 2022 01:55
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Fetch with progress
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async function fetchWithProgress(url, opts, progressCb) { | |
const response = await fetch(url, opts); | |
let received = 0; | |
let contentLength = Number(response.headers.get('Content-Length')) || 0; | |
if (!Number.isInteger(contentLength) || !Number.isFinite(contentLength) || contentLength <= 0) { | |
contentLength = null; | |
} | |
return new Response(new ReadableStream({ | |
async start(controller) { | |
const reader = response.body.getReader(); | |
while (true) { | |
const { done, value } = await reader.read(); | |
if (done) { | |
progressCb(received, contentLength, true); | |
break; | |
} | |
received += value.byteLength; | |
progressCb(received, contentLength, false); | |
controller.enqueue(value); | |
} | |
controller.close(); | |
}, | |
}), { | |
status: response.status, | |
statusText: response.statusText, | |
headers: response.headers, | |
}); | |
} |
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