+ if code := errStatus(err); code >= 500 || code == http.StatusTooManyRequests {
+ // If any of the remotes have a retryable
+ // error (and none succeed) we'll return 502.
+ returncode = http.StatusBadGateway
+ } else if code != http.StatusNotFound && returncode != http.StatusBadGateway {
+ // If some of the remotes have non-retryable
+ // non-404 errors (and none succeed or have
+ // retryable errors) we'll return 422.
+ returncode = http.StatusUnprocessableEntity
+ }