public static boolean acceptsGzip(Headers headers) {
        String ae = headers.getFirst(HttpHeaderNames.ACCEPT_ENCODING);
        return ae != null && ae.contains(HttpHeaderValues.GZIP.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