php - Website with optimal cache control -

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my goal
 let browsers cache whole website, download static content when have changed 1 or more files.

my situation
after research have found way this. add far future expires header htaccess file , add querystring files using filemtime() function.

the problem
 when click on address bar , type in website address in firefox, firebug displays
38.3 kb (36.4 kb cache)

when press f5 in firefox, firebug displays:
241.1 kb (10.9 kb cache)

now have tried same google , sending http header 304 back. have read lot etag , last modified header, have heard lot of people saying not reliable.

my question
 best solution if send http header 304 static content if user presses on f5, google?

i asking question because visiting website , using f5 see if there new information available. not reload images etcetera.


update
 seems firefox controlling way cache used , use cache when user presses f5.

the purpose of reload reload page. there no server-side header magic if browser witten ignore caches when user asks it.

the solution google check if crawler sent if-modified-since header with:

if ($_server["http_if_modified_since"]) {     header("http/1.0 304 not modified");     exit(); }

this trick work browsers, not in forced reload modes, firefox's shift+reload.


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