今天弄了一天，本来是直接设置主题，结果用的meta标签看起来没啥用，于是就改用了nginx，使用的是这个ngx_http_headers_module，非常好用，可以直接设置Cache-Control的请求头。

用法示例

expires 24h;
expires modified +24h;
expires @24h;
expires 0;
expires -1;
expires epoch;
add_header Cache-Control private;

需要说明的是，expires只能用一个，@是表示具体的时间。

语法:add_header name value;
默认:	 —
适用区间:	http, server, location, if in location

适用于 200, 201, 204, 206, 301, 302, 303, 304, 或者307请求

语法:expires [modified] time;
expires epoch | max | off;
默认值:	expires off;
适用区间:	http, server, location, if in location

同样适用于 200, 201, 204, 206, 301, 302, 303, 304, 或者 307这些HTTP请求。

epoch表示 “Thu, 01 Jan 1970 00:00:01 GMT”，max则表示 “Thu, 31 Dec 2037 23:55:55 GMT”同时Cach-control会被设置为十年。

安装

如果不支持，编译时候加入–with-ngx_http_headers_module即可了，Tengine则默认支持。

效果

HTTP/1.1 200 OK
Server: Tengine/1.5.2
Date: Thu, 09 Jan 2014 16:09:41 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/5.5.6
Set-Cookie: PHPSESSID=vqfpqsgr8d9du2h0tneok4o2f0; path=/
Expires: Fri, 10 Jan 2014 16:09:41 GMT
Cache-Control: max-age=86400
Pragma: no-cache
X-Pingback: http://catinmay.com/xmlrpc.php
Link: <http://wp.me/4cIyj>; rel=shortlink
Cache-Control: public

更新

使用add_header Last-Modified $sent_http_Expires;语句添加Last-Modified时间戳

HTTP/1.1 200 OKServer: nginx/1.4.1
Date: Fri, 10 Jan 2014 01:02:24 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
X-Powered-By: PHP/5.5.6
Set-Cookie: PHPSESSID=q67op8s83vo88stc4shbd0thq2; path=/
Expires: Sat, 11 Jan 2014 01:02:24 GMT
Cache-Control: max-age=86400
Pragma: no-cache
X-Pingback: http://catinmay.com/xmlrpc.php
Link: <http://wp.me/4cIyj>; rel=shortlink
Cache-Control: public
Last-Modified: Sat, 11 Jan 2014 01:02:24 GMT