public String getParameter(String name) {
        if(parent.parameters().containsKey(name)) {
            return parent.parameters().get(name).get(0);
        }
        else {
            return null;
        }
    }
Returns the Internet Protocol (IP) address of the interface
 on which the request was received.
container-core/src/main/java/com/yahoo/jdisc/http/filter/DiscFilterRequest.java