查看“Gzip proxied”的源代码

==gzip for cdn ==
<pre>
问题出现了 

Serving Compressed Files When Your Origin Server Is Running NGINX

When CloudFront forwards a request to the origin server, it includes a Via header. This causes NGINX to interpret the request as proxied and, by default, NGINX disables compression for proxied requests. If your version of NGINX includes the gzip_proxied setting, change the value to any so that NGINX will return compressed content to CloudFront. For more information, see the NGINX documentation for the module ngx_http_gzip_module.

可见 添加 如下到 nginx 字段
gzip_proxied    expired

Nginx作为反向代理的时候启用，开启或者关闭后端服务器返回的结果，匹配的前提是后端服务器必须要返回包含"Via"的 header头。

==参考==

http://nginx.org/en/docs/http/ngx_http_gzip_module.html

详细解释：nginx中gzip的各项配置以及配置参数的意思详解
http://blog.csdn.net/jessonlv/article/details/8016284

http://docs.aws.amazon.com/zh_cn/AmazonCloudFront/latest/DeveloperGuide/ServingCompressedFiles.html#compressed-content-cloudfront-file-types

[[category:nginx]]