If you're also wondering about what the changes were for 4.0 https://github.com/visionmedia/express/blob/master/History.md#400--2014-04-09 https://github.com/vi

If you're also wondering about what the changes were for 4.0 https://github.com/visionmedia/express/blob/master/History.md#400--2014-04-09 https://github.com/visionmedia/express/blob/master/History.m...