private static OptionalInt parsePort(String port) {
        try {
            return OptionalInt.of(Integer.parseInt(port));
        } catch (IllegalArgumentException e) {
            return OptionalInt.empty();
        }
    }
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