Dynamic web page design that can be cached in PHPSquid. Of course, you must first enable reload_assist_imson in CDN. in this way, no-cache is not used. this will convert no-cache to If-Modified-Since. therefore, to write the program master, you must first enable the reload_assist_ims on function in CDN. in this way, no-cache is not used. this will convert no-cache to If-Modified-Since. therefore, we can write a program to control If-Modified-Since. note: in the cache system architecture, it is best to control the backend, so the best way is to manage the expiration by the program. well, I only use php to write one, and other programs are the same.
See my program below. it will expire in 5 minutes.
$ Headers = apache_request_headers ();
$ Client_time = (isset ($ headers ['if-Modified-Since '])? Strtotime ($ headers ['if-Modified-Since ']): 0 );
$ Now = gmmktime ();
$ Now_list = gmmktime ()-60*5;
If ($ client_time <$ now and $ client_time> $ now_list ){
Header ('last-Modified: '. gmdate ('d, d m y h: I: S', $ client_time). 'gmt', true, 304 );
Exit (0 );
} Else {
Header ('last-Modified: '. gmdate ('d, d m y h: I: S', $ now). 'gmt', true, 200 );
}
?>
Login on. in this way, the user will not be afraid of sending no-cache, because it will convert no-cache to If-Modified-Since. so we write the program main...
