@Override
    public RequestOptionsBuilder responseTimeoutMillis(long responseTimeoutMillis) {
        checkArgument(responseTimeoutMillis >= 0, "responseTimeoutMillis: %s (expected: >= 0)",
                      responseTimeoutMillis);
        this.responseTimeoutMillis = responseTimeoutMillis;
        return this;
    }
A builder for creating a new {@link RequestOptions}.
core/src/main/java/com/linecorp/armeria/client/RequestOptionsBuilder.java