public static boolean isCompressed(Headers headers) {
        String ce = headers.getFirst(HttpHeaderNames.CONTENT_ENCODING);
        return ce != null && isCompressed(ce);
    }
Extract the client IP address from an x-forwarded-for header. Returns null if there is no x-forwarded-for header

@param xForwardedFor a <code>String</code> value
@return a <code>String</code> value
zuul-core/src/main/java/com/netflix/zuul/util/HttpUtils.java