code: @Deprecated
    public final OkHttpChannelBuilder enableKeepAlive(boolean enable) {
      if (enable) {
        return keepAliveTime(DEFAULT_KEEPALIVE_TIME_NANOS, TimeUnit.NANOSECONDS);
      } else {
        return keepAliveTime(KEEPALIVE_TIME_NANOS_DISABLED, TimeUnit.NANOSECONDS);
      }
    }
docs: Enable keepalive with default delay and timeout.
  
  @deprecated Use {@link #keepAliveTime} instead