概要
The resource temporarily resides at a different URL; keep using the original URL.
いつ発生するか
Returned for a temporary redirect; historically browsers changed the method to GET.
よくある原因
- Temporary maintenance or A/B redirect
- Post-login redirect to a landing page
- Legacy code using 302 where 303 or 307 is meant
解決方法
- Use 303 for POST-then-GET flows
- Use 307 to preserve the original method
- Reserve 301/308 for permanent moves