How to force reload of web page after user has followed links off it?

If you follow a link out of my webpage, how can I ensure the webpage reloads when the user returns?

Especially: if the link loads in a separate window, how can I reload my webpage then?

I am wondering about the approaches, especially 开发者_如何学JAVAany that avoid javascript, and what their pros and cons are.

The best way to go about this kind of problem is to request the browser doesn't cache the page - so that it simply has to reload each time.

The accepted way to do this is with the Cache-Control HTTP header, specifically setting it to no-cache, however there are a couple of possibilities depending on exactly the behaviour you want.