How to consume a remote service with ETag (Precondition required)?

[FabienHenique]

I am referring to URL:

undefined/docs/node.js/remote-services

Please get back to me on the following feedback:

Hello CAP team, when calling remote service, how can we add parameter like ETag and would be the syntax for this kind of query (POST <host>/sap/opu/odata/sap/API_OUTBOUND_DELIVERY_SRV;v=2/PostGoodsIssue?DeliveryDocument='80000001')?

[gregorw]

Why would you need a ETag for a create (POST)?

[FabienHenique]

In order to consume this API, ETag (If-Match: W/"'0001'") is mandatory.

Otherwise, the system will return an error message saying a precondition is missing 😞

[johannesvogel · Accepted solution]

Hi Fabien,

you can use custom http header using the srv.send API:

https://cap.cloud.sap/docs/node.js/services#srv-send

Hope that helps,

Johannes

[FabienHenique · Accepted solution]

Thanks johannesvogel, I've been able to use this!

[radu_simen · Accepted solution]

Is there any sample for SAP CAP with Java when using CqnUpdate and CqnService ?

[sharanatsap · Accepted solution]

+1 Yep, Looking for the same in CAP - Java