code: public ApiResponse<Void> getHandshakeWithHttpInfo() throws ApiException {
          com.squareup.okhttp.Call call = getHandshakeValidateBeforeCall(null, null);
          return apiClient.execute(call);
      }
docs: CometD handshake
  CometD handshake, see https://docs.cometd.org/current/reference/#_bayeux_meta_handshake
  @return ApiResponse&lt;Void&gt;
  @throws ApiException If fail to call the API, e.g. server error or cannot deserialize the response body