@Nullable
    @Override
    default T apply(RequestContext requestContext, HttpHeaders entries) {
        return sanitize(requestContext, entries);
    }
Sanitizes the specified {@link HttpHeaders}.
If {@code null} is returned, the specified {@link HttpHeaders} will be excluded from the log.
core/src/main/java/com/linecorp/armeria/common/logging/HeadersSanitizer.java