public void addAndValidate(HeaderName headerName, String value) {
        String normalName = Objects.requireNonNull(headerName, "headerName").getNormalised();
        Objects.requireNonNull(value, "value");
        addNormal(validateField(headerName.getName()), validateField(normalName), validateField(value));
    }
Adds the name and value to the headers and validate

@throws ZuulException on invalid name or value
zuul-core/src/main/java/com/netflix/zuul/message/Headers.java