Streams a file to this response as chunked data.
Useful for video sites.
Source
streamFile(File file,
{int chunkSize, int sleepMs: 0, bool resumable: true}) async {
if (!isOpen) return;
header(HttpHeaders.CONTENT_TYPE, lookupMimeType(file.path));
willCloseItself = true;
await file.openRead().pipe(underlyingResponse);
/*await chunked(file.openRead(), chunkSize: chunkSize,
sleepMs: sleepMs,
resumable: resumable);*/
}