Dynamic web page design in PHPSquid

Source: Internet
Author: User
Sometimes we need to control the expiration time of webpages such as the homepage. but for example, if we use Chinacache CDN, how can we design it so that it can cache my content?

Of course, 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 );

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