回答

例子如下

worker_processes  1;

events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    client_body_buffer_size 512k;
    proxy_connect_timeout 10;
    proxy_read_timeout 180;
    proxy_send_timeout 5;
    proxy_buffer_size 16k;
    proxy_buffers 4 64k;
    proxy_busy_buffers_size 128k;
    proxy_temp_file_write_size 128k;
    proxy_temp_path /home/cache_n/temp; //这个是临时缓存文件存放的路径  
    proxy_cache_path /home/cache_n levels=1:2 keys_zone=content:20m inactive=1d max_size=100m;  //这个路径是最终真实文件的缓存路径
    keepalive_timeout  65;
    server {
        listen       80;
        server_name  localhost;

        location / {
            proxy_cache content;
            proxy_cache_valid 200 302 304 206 24h;//你要缓存的http状态码和它们的缓存时间
            proxy_cache_valid any 1d;
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $remote_addr; 
            proxy_cache_key $host$uri$is_args$args;//缓存文件的命名规则
            proxy_pass http://192.168.0.1:90;
        }
     
        location ~ /pure(/.*) {//这个location主要就是把url中带/pure/的链接筛选出来，然后执行我们刚才安装的那个第三方清理缓存的模块。
             allow 192.0.0.0/24;
             deny all;
             proxy_cache_purge content $host$host$1$is_args$args;
        }
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}