Method altsvc

lib/internal/http2/core.js:1727–1771

(alt, originOrStream)

  // the origin. alt is a string containing the altsvc details. No fancy
  // API is provided for that.
  altsvc(alt, originOrStream) {
    if (this.destroyed)
      throw new ERR_HTTP2_INVALID_SESSION();

    let stream = 0;
    let origin;

    if (typeof originOrStream === 'string') {
      origin = getURLOrigin(originOrStream);
      if (origin === 'null')
        throw new ERR_HTTP2_ALTSVC_INVALID_ORIGIN();
    } else if (typeof originOrStream === 'number') {
      if (originOrStream >>> 0 !== originOrStream || originOrStream === 0) {
        throw new ERR_OUT_OF_RANGE('originOrStream',
                                   `> 0 && < ${2 ** 32}`, originOrStream);
      }
      stream = originOrStream;
    } else if (originOrStream !== undefined) {
      // Allow origin to be passed a URL or object with origin property
      if (originOrStream !== null && typeof originOrStream === 'object')
        origin = originOrStream.origin;
      // Note: if originOrStream is an object with an origin property other
      // than a URL, then it is possible that origin will be malformed.
      // We do not verify that here. Users who go that route need to
      // ensure they are doing the right thing or the payload data will
      // be invalid.
      if (typeof origin !== 'string') {
        throw new ERR_INVALID_ARG_TYPE('originOrStream',
                                       ['string', 'number', 'URL', 'object'],
                                       originOrStream);
      } else if (origin === 'null' || origin.length === 0) {
        throw new ERR_HTTP2_ALTSVC_INVALID_ORIGIN();
      }
    }

    validateString(alt, 'alt');
    if (!kQuotedString.test(alt))
      throw new ERR_INVALID_CHAR('alt');

    // Max length permitted for ALTSVC
    if ((alt.length + (origin !== undefined ? origin.length : 0)) > kMaxALTSVC)
      throw new ERR_HTTP2_ALTSVC_LENGTH();

    this[kHandle].altsvc(stream, origin || '', alt);
  }

  // Submits an origin frame to be sent.
  origin(...origins) {