Retreive eTag Header in Invoke HTTP for AD action

[trevorseward]

I'm creating a Flow that creates a Task in Planner and then needs to add checkboxes to the task. Adding checkboxes isn't an available Flow action so I have to do this via Graph.

Part of the PATCH requires the If-Match header with the last eTag value, per https://docs.microsoft.com/en-us/graph/api/plannertaskdetails-update.

How do I get the current eTag value after creating the Task in Flow? My Flow consists of:

Manual input task

Create a task (Planner)

Get task details (Planner)

Invoke an HTTP Request (HTTP for AD) w/ PATCH to the previously created Planner task.

My assumption is I need to do another Invoke an HTTP Request action immediately prior to the PATCH using a GET, but how do I then filter for and store the eTag value?

When I use Graph Explorer, the format of the Response Headers is:

   cache-control: ...

   client-request-id: ...

   content-type: ...

   etag: ...

   request-id: ...

Using https://graph.microsoft.com/v1.0/planner/tasks/<taskid>/details?$select=etag yields an HTTP 400. But beyond that, how would I store that value for consumption in the subsequent Invoke HTTP Request action?

[v-bacao-msft · Accepted solution]

Hi @trevorseward ,

If you could use HTTP to get the specified response, you could try to refer to the following expression to get the contents of Headers output.

Image reference:

Best Regards,