303
3xxSEO: neutralRFC 9110
HTTP 303 See Other
Redirect after a POST/PUT to prevent form resubmission (Post/Redirect/Get pattern).
Indexable by Google
No
Link equity passed
No
SEO Impact
Neutral
Category
3XX
SEO Impact
303 is rarely used in SEO contexts and is invisible to search engines since they don't submit forms. It is the correct response after a form submission to prevent browser "resend this form?" dialogs. From a crawl perspective, it behaves like a 302.
When to Use 303
After a successful form POST or PUT to redirect the browser to a result page (Post/Redirect/Get pattern).
HTTP Response Example
HTTP/1.1 303 See Other Location: /thank-you
Test with cURL
$ curl -X POST https://example.com/contact -L