关于Nginx 403 forbidden 错误踩的坑 directory index of "/xx/xx/xx/" is forbidden

                server {
        listen 
            xxx
            ;
        server_name down.cdbaidu.com;

        location / {
         
        root  /Downloads/Dokcers/b1/downloads;
        autoindex on;       # <----罪魁祸首，添加这个以后不再出现403错误
        #index  index.php index.html;  

        # auth 
        auth_basic "Please input B1 password";     # 设置加密登陆的提示
        auth_basic_user_file /etc/nginx/xxx/.htpasswd;  # 设置加密的账号密码文件
       }

        # log
        access_log /Downloads/Dokcers/b1/web/access.log;
        error_log /Downloads/Dokcers/b1/web/error.log info;  # 打开这个模式有注意排错

        # IP access  
        allow 192.168.x.0/22;  # 限制IP段登陆
        deny all;
    }