@Override
    public void setScheme(String scheme) {
        immutableCheck();
        this.scheme = scheme;
    }
Note: this is meant to be used typically in cases where TLS termination happens on instance.
For CLB/ALB fronted traffic, consider using {@link #getOriginalScheme()} instead.
zuul-core/src/main/java/com/netflix/zuul/message/http/HttpRequestMessageImpl.java