テクニカル SEO
www あり / なし
重要な理由
If both www and non-www versions load, search engines see duplicate sites and links are split between them.
修正方法
- Choose one version (with or without www).
- 301-redirect the other version to it and use the chosen one in canonical tags and sitemaps.
次のツールで確認
- Redirect Generator (.htaccess & Nginx) – Create 301 redirect rules for Apache .htaccess and Nginx, including HTTPS and www.
- Redirect Checker – Trace every hop of a redirect chain with status codes and timings.
スコア：合格したチェックは満点、警告は半分、エラーは 0 点になります。 SEO スコアの仕組み