Uri.https(String authority, String unencodedPath, [Map<String, String> queryParameters])

Creates a new https URI from authority, path and query.

This constructor is the same as Uri.http except for the scheme which is set to https.

Source 

factory Uri.https(String authority,
                  String unencodedPath,
                  [Map<String, String> queryParameters]) {
  return _makeHttpUri("https", authority, unencodedPath, queryParameters);
}