origin property
String originReturns the origin of the URI in the form scheme://host:port for the schemes http and https.
It is an error if the scheme is not "http" or "https", or if the host name is missing or empty.
See: http://www.w3.org/TR/2011/WD-html5-20110405/origin-0.html#origin
Source
String get origin;
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-core/Uri/origin.html