private static OptionalInt http2StreamId(Request request) {
        if (request.getConnectionMetaData().getHttpVersion() != HttpVersion.HTTP_2) return OptionalInt.empty();
        return OptionalInt.of(Integer.parseInt(request.getId()));
    }
Implements the request accessing logging for Jetty.

@author Oyvind Bakksjo
@author bjorncs
container-core/src/main/java/com/yahoo/jdisc/http/server/jetty/AccessLogRequestLog.java