php - linux nginx tomcat integration. What does expires 30d for filtering static files mean?

Question

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What do 30d and 1h mean?

Answer 1

nginx的expire指令是 控制页面缓存.

The expires directive can control the "Expires" and "Cache-Control" headers in the HTTP response (which controls page caching)

Refer to expires to control page caching

Official documentation nginx expire directive

Answer 2

Simply put, it is to control the cache time of static resource files in the browser, without having to download them from the server every time you request