ODATA 将 etag 从响应传递到请求

问：

我正在研究SAP集成，其中一个事务需要多个GET，PATCH和POST。此外，还需要在调用之间传递 etag。我正在尝试$batch但不知道如何在调用之间传递 etag，因为对实体的一次修改会更改 etag。这就是我尝试过的。

Content-Type: multipart/mixed;boundary=changeset_01

GET A_OutbDeliveryHeader(DeliveryDocument='0000000001') HTTP/1.1
sap-context-accept: header
Content-Type: application/json
Accept: application/json
Content-ID: C1

--changeset_01
Content-Type: application/http
Content-Transfer-Encoding: binary

PATCH A_OutbDeliveryItem(DeliveryDocument='0000000001',DeliveryDocumentItem='10') HTTP/1.1
sap-context-accept: header
Content-Type: application/json
Accept: application/json
Content-ID: C2
If-Match: xxxxx

{
  "ActualDeliveryQuantity": "2.000"
}


--changeset_01
Content-Type: application/http
Content-Transfer-Encoding: binary

PATCH A_OutbDeliveryHeader(DeliveryDocument='0000000001') HTTP/1.1
sap-context-accept: header
Content-Type: application/json
Accept: application/json
Content-ID: C3
If-Match: xxxxx

{
  "ActualGoodsMovementDate": "2023-03-14T13:33:10",
  "ActualGoodsMovementTime": "PT13H33M10S"
}


GET A_OutbDeliveryHeader(DeliveryDocument='0000000001') HTTP/1.1
sap-context-accept: header
Content-Type: application/json
Accept: application/json
Content-ID: C4


--changeset_01
Content-Type: application/http
Content-Transfer-Encoding: binary

POST PostGoodsIssue?DeliveryDocument='0000000001' HTTP/1.1
sap-context-accept: header
Content-Type: application/json
Accept: application/json
Content-ID: C5
If-Match: xxxxx


--changeset_01--


--batch_01--