HTTP 303 See Other tells the client to retrieve the resource at a different URL using a GET method, regardless of the original request method. This is the correct redirect to use after a POST (form submission, API call) when you want to redirect to a result page — the classic Post/Redirect/Get (PRG) pattern that prevents duplicate form submissions when users hit refresh.
Response includes the status code, standard headers (including Content-Type), and a small diagnostic JSON body describing the request and returned status.
Simulator URL (copy in the app after load — not a normal link):
https://httpstatus.com/api/status/303
Example request:
curl -i "https://httpstatus.com/api/status/303"The response to the request can be found under another URI using a GET method.
On this code, Inspector focuses on semantics, headers, and correctness warnings that commonly affect clients and caches.
303 See Other (RFC 7231 Section 6.4.4) was introduced specifically to address the ambiguity of 301/302 with POST requests. Unlike 301/302 (where method change is a browser bug) and 307 (which preserves the method), 303 explicitly requires changing to GET. This makes it perfect for the PRG pattern: POST /orders → 303 → GET /orders/42/confirmation. The redirect target should be a representation of the action's result, not the action itself. 303 responses are NOT cacheable. For API responses, 303 can redirect from a creation endpoint to the new resource's URL.
app.get('/old-path', (req, res) => {
res.redirect(303, '/new-path');
});from fastapi.responses import RedirectResponse
@app.get('/old-path')
async def old_path():
return RedirectResponse('/new-path', status_code=303)@GetMapping("/old-path")
public ResponseEntity<Void> oldPath() {
return ResponseEntity.status(303)
.header("Location", "/new-path")
.build();
}func oldPathHandler(w http.ResponseWriter, r *http.Request) {
http.Redirect(w, r, "/new-path", 303)
}