NGINX的location指令中的expires -1是什么意思? [英] What does `expires -1` mean in NGINX `location` directive?

问题描述

给出下面的示例location示例，-1对expires意味着什么?这是否意味着永不过期"或永不缓存"?

Given the sample location example below, what does -1 mean for expires? Does that mean "never expires" or "never caches"?

# cache.appcache, your document html and data
location ~* \.(?:manifest|appcache|html?|xml|json)$ {
  expires -1;
  access_log logs/static.log;
}

https://github.com/h5bp/server-configs-nginx/blob/master/h5bp/location/expires.conf

推荐答案

根据 nginx manual ，此指令将Expires和Cache-Control HTTP标头添加到响应中.

According to nginx manual, this directive adds the Expires and Cache-Control HTTP header to the response.

值-1表示将这些标头设置为:

Value -1 means these headers are set as:

Expires: 当前时间减去1秒

Cache-Control: no-cache

因此，总而言之，它指示浏览器不要缓存文档.

So in summary it instructs the browser not to cache the document.

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