Function parseHeaders

lib/core/util.js:420–464

* @param {(Buffer | string)[]} headers * @param {Record } [obj] * @returns {Record }

(headers, obj)

 * @returns {Record<string, string | string[]>}
 */
function parseHeaders (headers, obj) {
  if (obj === undefined) obj = {}

  for (let i = 0; i < headers.length; i += 2) {
    const key = headerNameToString(headers[i])
    let val = obj[key]

    if (val !== undefined) {
      if (!Object.hasOwn(obj, key)) {
        const headersValue = typeof headers[i + 1] === 'string'
          ? headers[i + 1]
          : Array.isArray(headers[i + 1])
            ? headers[i + 1].map(x => x.toString('latin1'))
            : headers[i + 1].toString('latin1')

        if (key === '__proto__') {
          Object.defineProperty(obj, key, {
            value: headersValue,
            enumerable: true,
            configurable: true,
            writable: true
          })
        } else {
          obj[key] = headersValue
        }
      } else {
        if (typeof val === 'string') {
          val = [val]
          obj[key] = val
        }
        val.push(headers[i + 1].toString('latin1'))
      }
    } else {
      const headersValue = typeof headers[i + 1] === 'string'
        ? headers[i + 1]
        : Array.isArray(headers[i + 1])
          ? headers[i + 1].map(x => x.toString('latin1'))
          : headers[i + 1].toString('latin1')

      obj[key] = headersValue
    }
  }

  return obj
}

/**
 * @param {Buffer[] | string[] | Record<string, string | string[]> | null | undefined} headers