Function checkInvalidHeaderChar

lib/_http_common.js:281–284

* True if val contains an invalid header value character. * By default uses strict validation per RFC 7230. * When lenient=true, uses relaxed validation per Fetch spec. * @param {string} val * @param {boolean} [lenient] - Use lenient validation (Fetch spec rules) * @returns {boolean}

(val, lenient = false)

 * @returns {boolean}
 */
function checkInvalidHeaderChar(val, lenient = false) {
  const regex = lenient ? lenientHeaderCharRegex : strictHeaderCharRegex;
  return regex.test(val);
}

function cleanParser(parser) {
  parser._headers = [];