Spring MVC “redirect:” prefix always redirects to http — how do I make it stay on https?

Question

I solved this myself, but I spent so long discovering such a simple solution, I figured it deserved to be documented here.

I have a typical Spring 3 MVC setup with

Answer 1

I add scheme="https" in file server.xml for connector with port="80":

<Connector port="80" protocol="HTTP/1.1" URIEncoding="UTF-8"
connectionTimeout="20000" redirectPort="443" scheme="https" />