瀏覽器會隱藏 www 子網域,www 子網域看起來會跟沒有 www 的根網域一模一樣。所以使用 www 子網域的時候應該要確保輸入根網域的時候也會重新導向到 www,才不會讓使用者輸入網址時不知道為何無法載入。
例如:架站服務 Netlify 預設指派 www 子網域給網站的時候會同時指派根網域。
If you assign an apex domain or a www subdomain to your site, Netlify will automatically add both the apex domain and the www subdomain.
— https://docs.netlify.com/domains-https/custom-domains/configure-external-dns/
以下是有 www 子網域但是造訪根網域時會除錯的常用臺灣網站,依 Tranco 排行排序。
最近更新:2023-04-14T11:43:16.603Z
這些網站有 www 子網域,瀏覽器上看起來像是沒有 www,但是照瀏覽器上所顯示的輸入時會出錯。
Tranco 排行 | 網站 | |
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#989278 | ||
#998882 |
Cloudflare 說明文件:DNS record types
若主要使用的網址是 www.example.com,要讓 example.com 重新導向到主網址:
如果 DNS 提供者像 Cloudflare 一樣支援 CNAME flattening,可以直接新增一個 CNAME 紀錄:
@
www.example.com
CNAME 紀錄一般無法用於根網域,此時可以自行複製 www 子網域的 A 紀錄,例如 www 指向 0.0.0.0 時只要再建立一個 A 紀錄: 便會
@
0.0.0.0
造訪 example.com 時便會跟 www.example.com 時解析成同一個 IP 位址。
之後再從伺服器回傳 302 或 307 重新導向到主網址。
作:如月飛羽;設計參考 Why No HTTPS.