address bar, then is it go to your domain? or give error?
Lets try this to solve that problem..
Give your thoughts in comments..
It can be done bu .htaccess
RewriteEngine On
RewriteCond %(HTTP_HOST) ! ^www.domainname.com$ [NC]
RewriteRule ^(.*)$ http://www.domainname.com/$1 [L, R=301]
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コメント（5件)
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</Files>
RewriteEngine on
RewriteCond %{HTTP_HOST} ^(www\.example\.com)(:80)? [NC]
RewriteRule ^(.*) http://example.com/$1 [R=301,L]
order deny,allow
# e.g. example.com
何も対策しない場合に次の状態になる人への解決策を提示しているだけだと思います。
wwwつき・・・正常アクセス
wwwなし・・・エラー