+ "usergroups:read usergroups:write users:read users:write identify";

    if (true) {
      client.requestOauthSession(scopes, null);
    } else {
      OAuthSession session = new OAuthSession(true,
          "xoxp-XXXXXXXXXX-XXXXXXXXXX-XXXXXXXXXXX-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX",
          scopes, "UXXXXXXXX", "My Slack Group", "TXXXXXXXX");

        if (done) {
          System.out.println("completed");
        } else {
          if (firstUpdate) {
            firstUpdate = false;
            if (contentLength == -1) {
              System.out.println("content-length: unknown");
            } else {
              System.out.format("content-length: %d\n", contentLength);
            }
          }

        System.out.println("Force cache: true");
        clientForCall = client.newBuilder()
            .addNetworkInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
            .build();
      } else {
        System.out.println("Force cache: false");
        clientForCall = client;
      }

      try (Response response = clientForCall.newCall(request).execute()) {