HTTP 303 See Other
Updated Free mock REST & WebSocket APIs
HTTP 303 See Other — The response to this request is at another URL, which the client should fetch with GET.
- Class
- 3xx Redirection
- Defined in
- RFC 9110 §15.4.4
- Official
- Yes (IANA registry)
- Cacheable by default
- No (unless Cache-Control/Expires say so)
Try it: get a real 303 response
Our test endpoint answers every request with 303 See Other.
curl -i https://mockfox.dev/api/status/303Use it in tests, health-check monitors or to see how your client handles a 303. Add ?delay=2000 to slow it down.
What does HTTP 303 mean?
The correct status for the Post/Redirect/Get pattern: after a form POST succeeds, the server answers 303 with Location: /orders/42 and the browser loads that page with GET, so refreshing doesn't resubmit the form. Unlike 302, the spec guarantees the method changes to GET (except for HEAD). Next.js uses 303 for redirect() called inside a Server Action.
Handling 303
- Visitors: Browsers handle redirects automatically. If you're stuck in a loop, clear the site's cookies and cache.
- Developers: Check the
Locationheader and test redirects withcurl -I. Prefer 301/308 for permanent moves and 302/303/307 for temporary ones.
Example 303 response
HTTP/1.1 303 See Other
Location: /orders/42
Content-Type: application/json
{"status":303,"error":"See Other"}3xx Redirection: Further action (usually following a Location header) is needed to complete the request. See the full list of HTTP status codes.
Related status codes
- 302 FoundThe resource is temporarily at a different URL, given in the Location header.
- 307 Temporary RedirectThe resource is temporarily at another URL and the client must repeat the request with the same method and body.
- 201 CreatedThe request succeeded and created a new resource, usually identified by the Location header.
Related tools
Frequently asked questions
What does HTTP 303 See Other mean?
The response to this request is at another URL, which the client should fetch with GET.
Is 303 an error?
No. 303 is a redirection status — the client needs to take another step, usually following the Location header.
Where is 303 defined?
In RFC 9110 §15.4.4. It's listed in the IANA HTTP Status Code Registry.
How can I test how my app handles a 303?
Call https://mockfox.dev/api/status/303 — it responds with 303 to any method, with CORS enabled. Add ?delay=2000 to simulate a slow response.