409 Error: The requested resource is not concurrent

[Andrew_Mai]

In my SAP/CAP, sometime, the request will return a error like this:

Not sure what will cause this error? And how to prevent it. Since it happen very randomly, I have no clue what can cause this issues.

[gregorw]

Does it happen with PUT requests as in the description of 409 - Conflict?

[Andrew_Mai]

No. This API is an function endpoint, which will trigger to export an excel file. So it should be GET method, not PUT.

[gregorw]

Maybe you can share a sample project on a public Git repository.

[Andrew_Mai]

I was able to resolve this issues by add a random parameter after the function, so it not happen any more. But still, the issues is coming from the If-Match headers if I'm not wrong. Will try to take another look at this issues.

[david_kunz2 · Accepted solution]

Hi andrew.mai ,

Yes, this happens if you're sending `if-match` or `if-none-match` headers and the respective entity has no etag configured. In future versions of @sap/cds (Node.js) we will ignore those headers. Currently, the error 'The requested resource is not concurrent' is thrown.

Best regards,
David

[eduardo_hinojosa]

Hi Andrew,

I am not sure, but it seem it is related with some service we can find in tcode SICF. You can debug it, looking for the method you can check in SCIF. For more information, read the following blog: https://blogs.sap.com/2016/07/15/how-to-debug-the-bsp-application-a-tutorial/

As it seems also it is a end point, you need to know who is the SAP user ID this end point is running.

I did it for idocxml, usually it retunrs in the webUI or the other transaction sending an IDOC an error 409, but doint the debugging session I realized there were troubles related with parsing or others.

I hope it helps you

Regards

Eduardo Hinojosa

[gregorw]

As the question is about the SAP Cloud Application Programming Model this has noting to do with an SICF endpoint.