import 'dart:io'; import 'package:belatuk_range_header/belatuk_range_header.dart'; var file = File('some_video.mp4'); void handleRequest(HttpRequest request) async { // Parse the header var header = RangeHeader.parse(request.headers.value(HttpHeaders.rangeHeader)!); // Optimize/canonicalize it var items = RangeHeader.foldItems(header.items); header = RangeHeader(items); // Get info header.items; header.rangeUnit; for (var item in header.items) { item.toContentRange(400); } // Serve the file var transformer = RangeHeaderTransformer(header, 'video/mp4', await file.length()); await file .openRead() .cast>() .transform(transformer) .pipe(request.response); }