Moved Permanently
3xx Redirection
Last updated:
The resource has been permanently moved to a new URL. Clients and search engines should update their references.
Description
The Location header specifies the new URL. Search engines transfer the vast majority of SEO signals (link equity) from the old URL to the new one via 301, making it the correct choice for permanent migrations.
When to use
Use 301 for permanent URL migrations, HTTPS upgrades, and www-to-apex canonicalization.
Common pitfalls
Do not use 301 for temporary A/B tests or maintenance redirects — use 302 instead.
Also searched as
Developers commonly search for 301 using phrases like 301 redirect · 301 vs 302 · 301 permanent redirect · 301 moved permanently · http 301 · 301 seo · 301 status code. All refer to the same HTTP 301 Moved Permanently response.
Specification
RFC 9110 §15.4.2
Examples
HTTP/1.1 301 Moved Permanently Content-Type: application/json Location: /new-url
res.status(301).redirect("/new-url");w.WriteHeader(http.StatusMovedPermanently)
return jsonify({"error": "Moved Permanently"}), 301