private static <T> void addNonNullValue(
            RequestLogEntry.Builder builder, T value, BiConsumer<RequestLogEntry.Builder, T> setter) {
        if (value != null) {
            setter.accept(builder, value);
        }
    }
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