demo · v132

Request.bytes() — the upload side

Most fetch demos cover the response side. Request.bytes() is just as new: it lets a worker / service-worker round-trip a body as a single Uint8Array, then re-attach it to an upstream fetch. Useful for payload sniffing, content negotiation rewriting, and signing.

checking Request.prototype.bytes…

request.bytes() length

—
bytes returned by the single .bytes() call

round-trip time

—
ms construct + read

hex preview

the code

const req = new Request("/api", { method: "POST", body: payload });
const bytes = await req.bytes();   // Uint8Array, no ArrayBuffer detour
// sign or rewrite, then re-fetch
fetch(new Request("/api", { method: "POST", body: bytes }));

see also