Bad RequestBad request syntax; server cannot understand
UnauthorizedAuthentication required; no credentials provided
ForbiddenServer refuses to execute request; insufficient permission
Not FoundServer cannot find the requested resource
Method Not AllowedHTTP method not allowed
Request TimeoutServer timed out waiting for the request
ConflictRequest conflicts with current resource state
GoneResource permanently deleted
Payload Too LargeRequest body exceeds server's allowed size
Unsupported Media TypeServer does not support the requested media type
Unprocessable EntityRequest format correct but semantically invalid
Too Many RequestsToo many requests; rate limit exceeded