Get Task Counts Headers. request Id 方法
Get a unique identifier for the request that was made to the Batch service. If a request is consistently failing and you have verified that the request is properly formulated, you may use this value to report the error to Microsoft. In your report, include the value of this request ID, the approximate time that the request was made, the Batch account against which the request was made, and the region that account resides in.
public UUID requestId()
the requestId value