Function prepareRequestHeadersObject

lib/internal/http2/util.js:711–749

* Takes a request headers object, validates it and sets defaults, and returns * the resulting headers in object format and NgHeaders string list format. * @returns {object}

(headers, session)

 * @returns {object}
 */
function prepareRequestHeadersObject(headers, session) {
  const headersObject = ObjectAssign({ __proto__: null }, headers);

  if (headersObject[HTTP2_HEADER_METHOD] === undefined) {
    headersObject[HTTP2_HEADER_METHOD] = HTTP2_METHOD_GET;
  }

  const connect = headersObject[HTTP2_HEADER_METHOD] === HTTP2_METHOD_CONNECT;

  if (!connect || headersObject[HTTP2_HEADER_PROTOCOL] !== undefined) {
    if (getAuthority(headersObject) === undefined)
      headersObject[HTTP2_HEADER_AUTHORITY] = session[kAuthority];
    if (headersObject[HTTP2_HEADER_SCHEME] === undefined)
      headersObject[HTTP2_HEADER_SCHEME] = session[kProtocol].slice(0, -1);
    if (headersObject[HTTP2_HEADER_PATH] === undefined)
      headersObject[HTTP2_HEADER_PATH] = '/';
  } else {
    if (headersObject[HTTP2_HEADER_AUTHORITY] === undefined)
      throw new ERR_HTTP2_CONNECT_AUTHORITY();
    if (headersObject[HTTP2_HEADER_SCHEME] !== undefined)
      throw new ERR_HTTP2_CONNECT_SCHEME();
    if (headersObject[HTTP2_HEADER_PATH] !== undefined)
      throw new ERR_HTTP2_CONNECT_PATH();
  }

  const headersList = buildNgHeaderString(
    headersObject,
    assertValidPseudoHeader,
    session[kStrictSingleValueFields],
  );

  return {
    headersObject,
    headersList,
    scheme: headersObject[HTTP2_HEADER_SCHEME],
    authority: getAuthority(headersObject),
    method: headersObject[HTTP2_HEADER_METHOD],
  };
}

const emptyArray = [];
const kNeverIndexFlag = StringFromCharCode(NGHTTP2_NV_FLAG_NO_INDEX);