Nginx配置缓存，提高网页访问速度

    # 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;
    }