HTTP 428 Precondition Required
The server requires the request to be conditional, to avoid lost updates.
Example response
HTTP
HTTP/1.1 428 Precondition Required
Content-Type: application/json; charset=utf-8
{ "error": "Precondition Required" }Look up the headers shown here in the HTTP headers reference.
Common questions
- What does HTTP 428 mean?
- Precondition Required. The server requires the request to be conditional, to avoid lost updates.
- Is 428 an error?
- Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.
Other 4xx codes
400 Bad Request401 Unauthorized402 Payment Required403 Forbidden404 Not Found405 Method Not Allowed406 Not Acceptable407 Proxy Authentication Required408 Request Timeout409 Conflict410 Gone411 Length Required412 Precondition Failed413 Content Too Large414 URI Too Long415 Unsupported Media Type416 Range Not Satisfiable417 Expectation Failed418 I'm a teapot421 Misdirected Request422 Unprocessable Content423 Locked424 Failed Dependency425 Too Early426 Upgrade Required429 Too Many Requests431 Request Header Fields Too Large451 Unavailable For Legal Reasons