| 1 | | | import 'dart:js_interop'; |
| 2 | | | |
| 3 | | | import 'package:web/web.dart' as web; |
| 4 | | | |
| 5 | | | @JS() |
| 6 | | | external JSPromise<web.Response> fetch(JSAny resource, [JSAny? options]); |
| 7 | | | |
| 8 | | | class UriChecker { |
| 9 | | | UriChecker._(); |
| 10 | | | |
| 11 | | | static const headers = {'method': 'HEAD'}; |
| 12 | | | |
| 13 | | 2 | static Future<bool> exists(Uri url) async { |
| 14 | | 2 | if (url.isScheme('data')) return true; |
| 15 | | | try { |
| 16 | | 2 | final res = await fetch(url.toString().toJS, headers.jsify()).toDart; |
| 17 | | 2 | return res.ok && (200 <= res.status) && (res.status < 300); |
| 18 | | | } catch (_) { |
| 19 | | 0 | return false; |
| 20 | | | } |
| 21 | | 2 | } |
| 22 | | | } |