[php]
view plain
copy
<?php $cache_time = 60 * 60; $modified_time = @$_SERVER['HTTP_IF_MODIFIED_SINCE']; if( strtotime($modified_time)+$cache_time > time() ){ header("HTTP/1.1 304"); exit; } header ("Last-Modified: " .gmdate("D, d M Y H:i:s", time() )." GMT"); header ("Expires: " .gmdate("D, d M Y H:i:s", time()+$cache_time )." GMT"); header ("Cache-Control: max-age=$cache_time"); echo time(); ?>
然后访问 看看HTTP响应状态码即可
200 请求成功
304 读取缓存
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