@Override
    public String toString() {
        return FileServiceConfig.toString(this, vfs, clock, entryCacheSpec, maxCacheEntrySizeBytes,
                                          serveCompressedFiles, autoIndex, headers, mediaTypeResolver,
                                          fallbackFileExtensions());
    }
Returns a newly-created {@link FileService} based on the properties of this builder.
core/src/main/java/com/linecorp/armeria/server/file/FileServiceBuilder.java