Require HTTPS for .Net Core Web Site

[DaveIII]

We have a .Net Core Web site and want to require HTTPS. If the user accesses the site from a bookmark that has http, I'd like them to automatically be rerouted to the same address via https. My interpretation of Enforce HTTPS in ASP.NET Core is that "app.UseHttpsRedirection();" would accomplish this. Instead, some 404's are generated. If I hit the 404's directly with an https address, they work fine.

How can we require the web site to require https?

We are using .Net Core 2.1.

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