To send responses to any request, the connectors need to first be connected to the Endpoint unit and then mapping needs to be done. Let's first make the connections on the Pipeline dashboard. We do this by simply dragging a line from a source unit to a target unit.
Let's make the following connections to the endpoint.
Drag a line from the findVariantById unit to the Endpoint unit.
Next, drag a line from the findEngineById unit to the Endpoint unit.
Finally, drag a line from the findModelById unit to the Endpoint unit.
The connected pipeline should look like the following.
To continue, see Map attributes to parameters.