概要
The resource has permanently moved to a new URL given in the Location header.
いつ発生するか
Returned when a URL has permanently changed; search engines transfer ranking to the new URL.
よくある原因
- A page or site was moved to a new URL or domain
- Switching from HTTP to HTTPS or non-www to www
- URL structure or slug was permanently changed
解決方法
- Point clients and links to the new URL in Location
- Keep the 301 in place so link equity transfers
- Use 308 instead if the request method must be preserved