“由于之前的某个请求发生的错误，导致当前请求失败，例如PROPPATCH。“ — wikipedia

“the method could not be performed on the resource because the requested action depended on another action and that action failed. For example, if a command in a PROPPATCH method fails, then, at minimum, the rest of the commands will also fail with 424 (Failed Dependency).“ — ietf