HTTP 303 — See Other
HTTP 303 tells the client to fetch the result of the request from another URL using GET, regardless of the original method. It is the standard answer to the POST-redirect-GET pattern that prevents duplicate form submissions on refresh.
When 303 shows up
- After a successful form POST, redirecting the browser to a confirmation page with GET.
- Pointing method-heavy API calls at a read-only result representation.
Mocking a 303 response
A response with this status can be faked end to end with a local mock rule — no backend changes needed. The configuration below mirrors the rule fields the ApiSimul editor uses (method, path, status, delay in milliseconds, response body):
{
"method": "GET",
"path": "/checkout/complete",
"status": 303,
"delay": 200,
"enabled": true,
"body": null
}Dynamic placeholders such as {{random.name}}, {{string.uuid}} or {{number.int 1 100}} can appear inside the body to vary each response, which keeps client-side list rendering and retry logic honest during development.
Frequently asked questions
What does HTTP 303 mean?
The result of the request is available elsewhere — fetch it with GET. The original method does not carry over.
How can I test a 303 response without a real backend?
Define a mock rule with the method and path your client requests and set the status to 303. The example configuration above returns this response after the listed delay, so the client exercises its 303 handling exactly as it would against a live server.
Related status codes
Need the response in your own project? Spin up rules for any status with the ApiSimul mock server, or browse every status code page.