HTTP 303 See Other

What Does HTTP 303 Mean?

HTTP 303 See Other indicates that the server is redirecting the client to a different resource, typically using a GET request. This is used after a POST request to redirect the user to a result page, preventing duplicate form submissions on browser refresh.

The Post/Redirect/Get (PRG) pattern is the most common use of 303. After processing a form submission (POST), the server responds with 303 to redirect the browser to a confirmation page (GET). If the user refreshes the confirmation page, only the GET request is repeated, not the original POST.

HTTP 303 explicitly changes the request method to GET regardless of the original method. This distinguishes it from 307 (which preserves the method) and 302 (which is ambiguous about method change).

Common Causes of 303 See Other

A POST request was processed and the server redirects the client to a result page using GET. This is the Post/Redirect/Get (PRG) pattern used to prevent duplicate form submissions.

The server explicitly converts the request method to GET when redirecting with 303.

How to Fix 303 See Other

HTTP 303 is working as designed when used for Post/Redirect/Get. If the redirect isn't working, verify that your server returns 303 (not 302 or 301) after processing POST requests. If the form data is being lost, check that you're storing it in the session before redirecting.

Ensure your server framework is sending the correct 303 status code, not defaulting to 302.

Related Status Codes

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