访问不带www的域名直接下载文件，带www的可以访问

我刚好遇到了这个问题，发现思否上有相似问题请查看

问题描述访问不带www的域名直接下载文件，带www的可以访问带www 不带www

问题出现的环境背景及自己尝试过哪些方法阿里云服务器原来给别人用过一阵子，最近拿回来了重新初始化了。然后这个域名原来是绑定在我用宝塔搭建的wordpress博客上的，初始化以后呢所有东西都清理了。但是访问不带www的域名会直接下载一个文件，文件内容如下：

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', true);

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp-blog-header.php' );

按照思否上提供的301重定向方法做了一下nginx.conf的修改，但是没什么效果:

        listen 80;
        server_name rocwong.cn;
        return 301 http://www.rocwong.cn$request_uri;
    }

    server {
        listen       80;
        server_name www.rocwong.cn;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000

        location ~ \.php$ {
            root           html;
            fastcgi_pass   127.0.0.1:9000;
            fastcgi_index  index.html;
            fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
            include        fastcgi_params;
        }

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        location ~ /\.ht {
            deny  all;
        }
    }

补一张域名解析的配置信息图：希望各位大佬不辞吝教，提供一些解决方案和思路给我，谢谢啦~