@UnstableApi
    public AbstractClientOptionsBuilder responseTimeoutMode(ResponseTimeoutMode responseTimeoutMode) {
        return option(ClientOptions.RESPONSE_TIMEOUT_MODE,
                      requireNonNull(responseTimeoutMode, "responseTimeoutMode"));
    }
Sets the {@link ResponseTimeoutMode} which determines when a {@link #responseTimeout(Duration)}}
will start to be scheduled.

@see ResponseTimeoutMode
core/src/main/java/com/linecorp/armeria/client/AbstractClientOptionsBuilder.java