public HttpFileServer(
Components.IFileSourceResolver fileSourceResolver,
IContentTypeProvider contentTypeProvider,
IOptionsMonitor <Components.HttpServerOptions> optionsSource,
RecyclableMemoryStreamManager streamManager)
{
_fileSourceResolver = fileSourceResolver ?? throw new ArgumentNullException(nameof(fileSourceResolver));
_contentTypeProvider = contentTypeProvider ?? throw new ArgumentNullException(nameof(contentTypeProvider));
_optionsSource = optionsSource ?? throw new ArgumentNullException(nameof(optionsSource));
_streamManager = streamManager ?? throw new ArgumentNullException(nameof(streamManager));
}