示例：
https://moqu8.com/forum.php ==> https://we.moqu8.com/forum.php

Apache:

RewriteCond %{HTTP_HOST} ^moqu8.com$ 

RewriteRule ^(.*)$ https://we.moqu8.com/$1 [R=301,L]

Nginx:

if ($http_host ~ "^moqu8.com$"){

	set $rule_0 1$rule_0;

}

if ($rule_0 = "1"){

	rewrite ^/(.*)$ https://we.moqu8.com/$1 permanent;

}