Uri class Null safety

A parsed URI, such as a URL.

To create a URI with specific components, use new Uri:

var httpsUri = Uri(
    scheme: 'https',
    host: 'dart.dev',
    path: '/guides/libraries/library-tour',
    fragment: 'numbers');
print(httpsUri); // https://dart.cn/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: '[email protected]',
    queryParameters: {'subject': 'Example'});
print(mailtoUri); // mailto:[email protected]?subject=Example

HTTP and HTTPS URI

To create a URI with https scheme, use Uri.https or Uri.http:

final httpsUri = Uri.https('example.com', 'api/fetch', {'limit': '10'});
print(httpsUri); // https://example.com/api/fetch?limit=10

File URI

To create a URI from file path, use Uri.file:

final fileUriUnix =
    Uri.file(r'/home/myself/images/image.png', windows: false);
print(fileUriUnix); // file:///home/myself/images/image.png

final fileUriWindows =
    Uri.file(r'C:\Users\myself\Documents\image.png', windows: true);
print(fileUriWindows); // file:///C:/Users/myself/Documents/image.png

If the URI is not a file URI, calling this throws UnsupportedError.

Directory URI

Like Uri.file except that a non-empty URI path ends in a slash.

final fileDirectory =
    Uri.directory('/home/myself/data/image', windows: false);
print(fileDirectory); // file:///home/myself/data/image/

final fileDirectoryWindows = Uri.directory('/data/images', windows: true);
print(fileDirectoryWindows); //  file:///data/images/

URI from string

To create a URI from string, use Uri.parse or Uri.tryParse:

final uri = Uri.parse(
    'https://dart.cn/guides/libraries/library-tour#utility-classes');
print(uri); // https://dart.cn
print(uri.isScheme('https')); // true
print(uri.origin); // https://dart.cn
print(uri.host); // dart.dev
print(uri.authority); // dart.dev
print(uri.port); // 443
print(uri.path); // guides/libraries/library-tour
print(uri.pathSegments); // [guides, libraries, library-tour]
print(uri.fragment); // utility-classes
print(uri.hasQuery); // false
print(uri.data); // null

See also:

• URIs in the library tour
• RFC-3986
• RFC-2396
• RFC-2045