Sitecore uses “302 found” to redirect users to my custom 404 page - is that legitimate?

Question

This is more of a HTTP spec question than a Sitecore question.

I have a 404 error page set up in Sitecore:

Answer 1

As well as what Ruud has suggested, there was a blog post by Kern Herskind that uses a Sitecore/IIS approach without having to write any additional code.