nginx.conf

user  root; # nginx 用户权限 执行lua创建图片命令需要读写权限
worker_processes  auto;

error_log /var/log/nginx/error.log;
pid        logs/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       mime.types;

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    map $http_accept $webp_suffix { # 检测accept中是否支持webp图片格式
        default   "";
        "~*webp"  ".webp";
    }
    
    server {
        listen       80;
        listen       [::]:80 default_server;
        server_name  webp.leewr.com;
        root         /home/leewr/mono/app/public/december; # 你站点的位置
        

        
        location ~* ^(.+\.(jpg|png|jpeg|gif))(.webp)$ { # 正则匹配图片 paht/name.jpg.webp 格式的图片请求
            if (!-f $request_filename) { # 如果图片不存在
                access_log /usr/local/nginx/logs/ImageResizer.log main; # 设置日志文件
                set $request_filepath /home/leewr/mono/app/public/december$1; # 设置图片真实路径的变量
                set $ext $3; # 设置图片扩展名$ext变量
                content_by_lua_file lua/webp.lua; # 调用nginx/lua目录下的webp.lua文件
            }
        }
    }
}