[andretti1977]

Just a note about the “.do” extension: if I correctly recall, it was introduced by struts framework which used “Action” as a naming convention such as Spring uses “Controller” as suffix, and so they used “.do” as extension.

[xxs]

I've never used 'struts' personally, however mapping servlets directly to ".do" was a recommendation (can't quote books any longer, though - it has been well over 2 decades)