static AggregatedHttpFileBuilder builder(HttpData data) {
        return builder(data, System.currentTimeMillis());
    }
Returns a new {@link AggregatedHttpFileBuilder} that builds an {@link AggregatedHttpFile} from
the specified {@link HttpData}. The last modified date of the file is set to 'now'.
core/src/main/java/com/linecorp/armeria/server/file/AggregatedHttpFile.java