Some resources may not be created immediately when POSTed, in these instances the server will return a HTTP Status Code of 202 (Accepted) instead of 201 (Created). This could be because the operation is processing intensive and may be long running. In these cases, the response will return a location header that references an item in the “Queue”.

Here you can poll the Queue for a particular Queue Item by Id. This Queue Item will provide additional information about the status of the long running process.