# proxy缓存临时文件的大小    proxy_temp_file_write_size 256k;    proxy_temp_path ~/nginx/temp;    proxy_cache_path ~/nginx/cache levels=1:2            keys_zone=cache_one:200m inactive=1d max_size=3g;server {        listen       80;         server_name  www.impress.pw;        server_name  ali.impress.pw;        root    impress_root;        index   index.htm;        location / {                                                                                                                                             proxy_cache         cache_one; # 缓存名称            proxy_cache_methods GET HEAD; #尽量不要缓存PUT POST方法            proxy_cache_min_uses 1;            proxy_cache_valid   200 302 10m;            proxy_cache_valid   404 400 1m;             proxy_cache_valid   any 1m; 
            proxy_cache_bypass  /admin; # 不缓存的方法            proxy_cache_key     "$host:$server_port$uri$is_args$args";            proxy_next_upstream http_502 http_504 error timeout invalid_header;            proxy_redirect      off;            proxy_pass          http://impress_server;            proxy_set_header    Host    $host;            proxy_set_header    X-Real-IP $remote_addr;            proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;            # add the Header of expires            expires 1d;             # File uplaod limits            client_max_body_size    2048m;        }           location /WEB-INF/ {            deny    all;        }                                                                                                                                                    location ~ /.*\.(css|js|gif|jpg|jpeg|png|bmp|swf)$ {            proxy_cache         cache_one;            proxy_cache_methods GET HEAD POST;            proxy_cache_min_uses 1;            proxy_cache_valid   200 302 10m;            proxy_cache_valid   404 400 1m;            proxy_cache_valid   any 1m;            proxy_cache_key     "$host:$server_port$uri$is_args$args";            # 如果后端的服务器返回502、504、执行超时等错误，自动将请求转发到upstream负载均衡池中的另一台服务器，实现故障转移。            proxy_next_upstream http_502 http_504 error timeout invalid_header;            proxy_redirect      off;            proxy_pass          http://impress_server;            proxy_set_header    Host    $host;            proxy_set_header    X-Real-IP $remote_addr;            proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;            # the browser cached time            expires 10d;        }        access_log  logs/impress_access.log;    }