What does HTTP 301 mean?
The resource has a new permanent URL and clients should use it from now on.
Common causes and when you see it
Used when moving a page, changing domains or enforcing https/www.
How to fix or handle it
Update links to the new URL. For SEO, 301 passes ranking signals. Avoid redirect chains.
Test it yourself
Send a request with the online API tester, inspect the response with the HTTP header checker, or host an endpoint that returns 301 with the mock API generator to see how your app reacts.
HTTP 301 questions
The resource has a new permanent URL and clients should use it from now on.
Used when moving a page, changing domains or enforcing https/www.
Update links to the new URL. For SEO, 301 passes ranking signals. Avoid redirect chains.