428
⚠️ Client Error RFC 6585
Precondition Required
The origin server requires the request to be conditional.
Common Use
Prevents the "lost update" problem. Server requires If-Match or If-Unmodified-Since headers for state-changing requests.
API Endpoint
https://codes.uncodigo.com/http/428 Example with curl
curl -i https://codes.uncodigo.com/http/428Try It
GET /http/428 Click "Send Request" to see the response...