flutterで相対パスを処理する

パターン１

var httpsUri = Uri(
      scheme: 'https',
      host: 'example.com',
      path: '/page/',
    );
print(httpsUri);
httpsUri = httpsUri.resolve("../aaa.txt");
print(httpsUri);

もしくは

var httpsUri = Uri.parse("https://example.com/page/");
print(httpsUri);
httpsUri = httpsUri.resolve("../aaa.txt");
print(httpsUri);

結果

https://example.com/page/
https://example.com/aaa.txt

パターン２

var httpsUri = Uri.parse("https://example.com/page/bbb.txt");
print(httpsUri);
httpsUri = httpsUri.resolve("../aaa.txt");
print(httpsUri);

結果

https://example.com/page/bbb.txt
https://example.com/aaa.txt