Vary:Accept-Encoding的用途
2012-09-06 11:47:08| 分类： rhel_apache|字号 订阅
查看网页的response header一般都有Vary头（服务器支持压缩的都有），意思是说squid要把客户端传来的某个头区别对待，譬如Vary:Accept-Encoding，客户端发来Accept-Encoding:gzip（MSIE）, deflate时squid会为gzip, deflate做一个存档；如果客户端没发来Accept-Encoding这个头(wget)，squid又会为无Accept-Encoding做另一个存档；这两个存档的内容是不一样的，gzip, deflate的是压缩后的内容，一堆乱码，无Accept-Encoding的则是网页源码。
知道了Vary的原理，剩下的事就容易了，在网页输出时加上Vary:User-Agent，意味着squid要为每一种User-Agent存一个存档，nginx里这样配置即可：
add_header Vary Accept-Encoding;
这时网页的response header会有Vary：
Vary:Accept-Encoding;
引用出处：http://zhumeng8337797.blog.163.com/blog/static/10076891420128611478976/
Squid: Optimising Web Delivery
Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response times by caching and reusing frequently-requested web pages. Squid has extensive access controls and makes a great server accelerator. It runs on most available operating systems, including Windows and is licensed under the GNU GPL.
SQUID是个缓存代理服务器