Function establishWebSocketConnection

deps/undici/undici.js:15158–15246

(url, protocols, client, handler, options)

    var crypto = runtimeFeatures.has("crypto") ? require("node:crypto") : null;
    var warningEmitted = false;
    function establishWebSocketConnection(url, protocols, client, handler, options) {
      const requestURL = url;
      requestURL.protocol = url.protocol === "ws:" ? "http:" : "https:";
      const request = makeRequest({
        urlList: [requestURL],
        client,
        serviceWorkers: "none",
        referrer: "no-referrer",
        mode: "websocket",
        credentials: "include",
        cache: "no-store",
        redirect: "error",
        useURLCredentials: true
      });
      if (options.headers) {
        const headersList = getHeadersList(new Headers(options.headers));
        request.headersList = headersList;
      }
      const keyValue = crypto.randomBytes(16).toString("base64");
      request.headersList.append("sec-websocket-key", keyValue, true);
      request.headersList.append("sec-websocket-version", "13", true);
      for (const protocol of protocols) {
        request.headersList.append("sec-websocket-protocol", protocol, true);
      }
      const permessageDeflate = "permessage-deflate; client_max_window_bits";
      request.headersList.append("sec-websocket-extensions", permessageDeflate, true);
      const controller = fetching({
        request,
        useParallelQueue: true,
        dispatcher: options.dispatcher,
        processResponse(response) {
          if (response.type === "error" || response.status !== 101) {
            if (response.socket?.session == null) {
              failWebsocketConnection(handler, 1002, "Received network error or non-101 status code.", response.error);
              return;
            }
            if (response.status !== 200) {
              failWebsocketConnection(handler, 1002, "Received network error or non-200 status code.", response.error);
              return;
            }
          }
          if (warningEmitted === false && response.socket?.session != null) {
            process.emitWarning("WebSocket over HTTP2 is experimental, and subject to change.", "ExperimentalWarning");
            warningEmitted = true;
          }
          if (protocols.length !== 0 && !response.headersList.get("Sec-WebSocket-Protocol")) {
            failWebsocketConnection(handler, 1002, "Server did not respond with sent protocols.");
            return;
          }
          if (response.socket.session == null && response.headersList.get("Upgrade")?.toLowerCase() !== "websocket") {
            failWebsocketConnection(handler, 1002, 'Server did not set Upgrade header to "websocket".');
            return;
          }
          if (response.socket.session == null && response.headersList.get("Connection")?.toLowerCase() !== "upgrade") {
            failWebsocketConnection(handler, 1002, 'Server did not set Connection header to "upgrade".');
            return;
          }
          const secWSAccept = response.headersList.get("Sec-WebSocket-Accept");