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Nginx proxy_cache_valid
source link: https://fann.im/blog/2014/12/09/nginx-proxy_cache_valid/
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Nginx proxy_cache_valid
Dec 9, 2014
proxy_cache 可以缓存 upstream 响应，其中 proxy_cache_valid 设置缓存有效时间，需要注意的是 Nginx 检查缓存是否有效的优先级问题。根据文档和 Igor，Nginx 判断缓存有效的顺序是：
X-Accel-ExpiresExpires/Cache-Controlproxy_cache_valid
也就是说 Nginx 会优先用 upstream 设置的缓存有效期，这种情况下 Nginx 相当于 Client，如果想忽略缓存直接到 upstream 更新，类似浏览器忽略本地缓存，可以这样设置：
proxy_ignore_headers X-Accel-Expires Expires Cache-Control;
另外 proxy_cache_path ... inactive=10m; 不受 upstream 影响，缓存文件在指定时间内没有被再次访问会被清理删除。
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