POST request body is an empty string during service invocation between Dapr sidecars

Question

Hi,

I have deployed two services on Container Apps, both setup using Fastify, both with Dapr enabled.

I cannot seem to get the POST requests between the two services working. If Service A make a POST request with a request body to Service B, the request.body turns out to be an empty string in Service B.

However, if I invoke the POST route of Service B directly on Postman with a JSON request body. It works fine.

I cannot figure the reason why.

And advice is appreciated !