The reason and solution of nginx cache problem _nginx

nginx.conf part of the content:

  Proxy_temp_path  /nginx/cache/temp;
  Proxy_cache_path/nginx/cache/path levels=1:2 keys_zone=cache_test:2048m inactive=7d max_size=10g;
......
 Location ~. (gif|jpg|jgep|png) $ {
    Proxy_pass http://upstreams;
   
    Proxy_ignore_headers x-accel-expires Expires Cache-control Set-cookie;
    Proxy_cache cache_test;
    #设置缓存的key
    proxy_cache_key $host $uri$is_args$args;
    #设置状态码为200和304的响应可以进行缓存, and the cache time is 1 days
    proxy_cache_valid 304 1d;
    Expires 30d;
  }

Nginx does not cache reason

By default, whether the cache is nginx by the Nginx cache server is determined by the source server, and the caching server needs to strictly follow the header of the source server response to determine whether caching and caching is frequent.

Headers are mainly as follows:

Cache-control：no-cache、no-store

If these two values are present, the Nginx cache server is definitely not cached

Expires：1980-01-01

If the date appears earlier than the current time, it is not cached.

Resolving non-caching scenarios

2.1 Method One:

To modify the header of a program or source server Web program response

2.2 Method Two:

The Nginx agent directly adds the following sentence:

Proxy_ignore_headers x-accel-expires Expires Cache-control Set-cookie;

Summarize

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