网站根目录新建.htaccess。

写入以下内容：

方法一

RewriteEngine On

RewriteCond %{SERVER_PORT} 80

RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R,L]

方法二

RewriteEngine On

RewriteCond %{SERVER_PORT} 80

RewriteCond %{HTTP_HOST} ^niaoyundemo.com [NC,OR]

RewriteCond %{HTTP_HOST} ^www.niaoyundemo.com [NC]

RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R,L]