HTTP 301
Moved Permanently
Redirect
What does "HTTP 301 Moved Permanently" mean?
Plain-English Meaning
The resource has permanently moved to a new URL. Browsers and search engines should update their records.
Common Causes
- Domain migration (old.com → new.com)
- URL restructure
- Moving from http to https
- Removing www prefix
What Users Can Do
Usually invisible — your browser follows the redirect automatically.
What Developers Can Do
Use 301 when permanently moving a resource. Search engines will transfer link equity to the new URL (usually).
Related Status Codes
Seeing HTTP 301 on a specific site?
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