@VisibleForTesting
    static boolean isCompressed(String contentEncoding) {
        return contentEncoding.contains(HttpHeaderValues.GZIP.toString())
                || contentEncoding.contains(HttpHeaderValues.DEFLATE.toString())
                || contentEncoding.contains(HttpHeaderValues.BR.toString())
                || contentEncoding.contains(HttpHeaderValues.COMPRESS.toString());
    }
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