303
Redirection
303 See Other
The response to the request can be found under a different URL using a GET method.
Description
303 See Other redirects the client to a different URL using GET, regardless of the original request method. It is commonly used after a POST request to prevent the user from accidentally resubmitting a form when they press the browser's Back button (the Post/Redirect/Get pattern).
Unlike 301/302, the 303 explicitly changes the method to GET for the follow-up request.
Common Causes
- Post/Redirect/Get (PRG) pattern after form submission
- Redirecting after a state-changing operation (create, update, delete)
- OAuth flows redirecting to a confirmation page
How to Fix
- Use 303 (not 302) for POST-to-GET redirects to follow the HTTP spec
- Apply PRG pattern on all form submissions to prevent double-submit
- Combine with flash messages to display success confirmation after redirect
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