scheme property
String schemeThe scheme component of the URI.
Returns the empty string if there is no scheme component.
A URI scheme is case insensitive. The returned scheme is canonicalized to lowercase letters.
Source
String get scheme;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-core/Uri/scheme.html