RPC Initialization Issue: Empty Response Despite Expected Return

Does anyone know why the following RPC initialization code (in launch.ts) initializes properly with the following requests / handlers, when cURling with the following:

curl -i -XPOST http://localhost:3191/rpc/agents -H "Content-Type: application/ndjson" --data '{"_tag":"Request","id":"1","tag":"ListAgents","payload":{}}'

yields an empty response, when the RPC handler must return something structurally?
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