テクニカル SEO
HTTP ステータス
重要な理由
Only pages that return HTTP 200 can be indexed. Error codes (4xx, 5xx) keep the page out of search and tell visitors something is broken.
修正方法
- Make sure the URL returns 200 OK.
- Fix server errors (5xx) in your hosting or application logs.
- For moved pages use a 301 redirect; for removed pages a 404 or 410 is correct.
次のツールで確認
- Bulk HTTP Status Checker – Check the status code, redirects and response time of up to 25 URLs at once.
- 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