Structure response headers while retaining duplicate fields.
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Node.js 22+ · ES module (.mjs)
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const raw = "Content-Type: application/json\nCache-Control: no-store";
const headers = [];
for (const line of raw.split(/\r?\n/)) {
if (!line.trim() || /^HTTP\//i.test(line)) continue;
const colon = line.indexOf(":");
if (colon <= 0) throw new Error("Invalid header: " + line);
headers.push([line.slice(0, colon).trim().toLowerCase(), line.slice(colon + 1).trim()]);
}
console.log(headers); // Array preserves duplicate Set-Cookie fields.Structure response headers while retaining duplicate fields.
Names precede the colon. Repeated fields are kept as arrays.
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