DART

dart uri

var httpsUri = Uri(
    scheme: 'https',
    host: 'dart.dev',
    path: '/guides/libraries/library-tour',
    fragment: 'numbers');
print(httpsUri); // https://dart.dev/guides/libraries/library-tour#numbers

httpsUri = Uri(
    scheme: 'https',
    host: 'example.com',
    path: '/page/',
    queryParameters: {'search': 'blue', 'limit': '10'});
print(httpsUri); // https://example.com/page/?search=blue&limit=10

final mailtoUri = Uri(
    scheme: 'mailto',
    path: 'John.Doe@example.com',
    queryParameters: {'subject': 'Example'});
print(mailtoUri); // mailto:John.Doe@example.com?subject=Example

dart uri

var httpsUri = Uri(
    scheme: 'https',
    host: 'dart.dev',
    path: '/guides/libraries/library-tour',
    fragment: 'numbers');
print(httpsUri); // https://dart.dev/guides/libraries/library-tour#numbers

httpsUri = Uri(
    scheme: 'https',
    host: 'example.com',
    path: '/page/',
    queryParameters: {'search': 'blue', 'limit': '10'});
print(httpsUri); // https://example.com/page/?search=blue&limit=10

final mailtoUri = Uri(
    scheme: 'mailto',
    path: 'John.Doe@example.com',
    queryParameters: {'subject': 'Example'});
print(mailtoUri); // mailto:John.Doe@example.com?subject=Example