Question

I would like for my site when someone clicks "Back" or "Forward" for the server to tell the browser to load the cache instead of reloading the entire page. I ve tested some headers and done research, but I can t seem to get this to function as intended.

Update: The if-modified since header is not something I d like to do. There s got to be more general options when it comes to caching. Even if it doesn t work in every browser (though that would be ideal) even just Firefox/Chrome would be excellent.

Answer 1

I think you ll find that no matter what you do, the Back button functionality may or may not listen...the functionality differs from browser to browser and isn t up to the page being viewed.

There are plenty of tips and tricks for getting the browser to do what you want...but in the end it s up to whoever coded the browser if they want to listen or not.

Answer 2

Check for the If-Modified-Since header before you output anything --- if it is recent enough, return a 304 Not Modified http status code and do not output the page.

Answer 3

You can conrol this behaviour with the Cache-Control header. This tutorial seems to be fairly comprehensive: Caching Tutorial

Answer 4

As far as i know there is no other way then using something like ZendCache or MemCache for those kind of things.

There reason is, in my optionion, that the server can t tell if the browser got the page cached or not so the server always send the full content, and executing the php script.

Using a seperate cache server (like zend or memcache) you can just forward the plain html without going through the whole script again.

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