ifModifiedSince property
DateTime ifModifiedSince
read / write
Gets and sets the "if-modified-since" date. The value of this property will reflect the "if-modified-since" header.
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/HttpHeaders/ifModifiedSince.html