Function _storeHeader

lib/_http_outgoing.js:430–565

(firstLine, headers)

OutgoingMessage.prototype._storeHeader = _storeHeader;
function _storeHeader(firstLine, headers) {
  // firstLine in the case of request is: 'GET /index.html HTTP/1.1\r\n'
  // in the case of response it is: 'HTTP/1.1 200 OK\r\n'
  const state = {
    connection: false,
    contLen: false,
    te: false,
    date: false,
    expect: false,
    trailer: false,
    header: firstLine,
  };
  const lenient = this._isLenientHeaderValidation();

  if (headers) {
    if (headers === this[kOutHeaders]) {
      for (const key in headers) {
        const entry = headers[key];
        processHeader(this, state, entry[0], entry[1], false, lenient);
      }
    } else if (ArrayIsArray(headers)) {
      if (headers.length && ArrayIsArray(headers[0])) {
        for (let i = 0; i < headers.length; i++) {
          const entry = headers[i];
          processHeader(this, state, entry[0], entry[1], true, lenient);
        }
      } else {
        if (headers.length % 2 !== 0) {
          throw new ERR_INVALID_ARG_VALUE('headers', headers);
        }

        for (let n = 0; n < headers.length; n += 2) {
          processHeader(this, state, headers[n + 0], headers[n + 1], true, lenient);
        }
      }
    } else {
      for (const key in headers) {
        if (ObjectHasOwn(headers, key)) {
          processHeader(this, state, key, headers[key], true, lenient);
        }
      }
    }
  }

  let { header } = state;

  // Date header
  if (this.sendDate && !state.date) {
    header += 'Date: ' + utcDate() + '\r\n';
  }

  // Force the connection to close when the response is a 204 No Content or
  // a 304 Not Modified and the user has set a "Transfer-Encoding: chunked"
  // header.
  //
  // RFC 2616 mandates that 204 and 304 responses MUST NOT have a body but
  // node.js used to send out a zero chunk anyway to accommodate clients
  // that don't have special handling for those responses.