iPhone Web app cache control for sensitive data

I am in the process of investigating whether it is possible to prevent mobile Safari from caching certain file. I went through a few posts about controlling caches in SO (e.g. meta tag, HTTP headers), and a few blog post. This one seems to implies that components are not cache开发者_开发技巧d unless either Expires or Cache-Control in the response header.

I wonder if anyone has tried any of those and whether any of those actually works and don't work? Also, how to test them?