[Python] FastAPI post does not recognize my parameter

I am usually using Tornado, and trying to migrate to FastAPI.

Let's say, I have a very basic API as follows:

@app.post("/add_data")
async def add_data(data):
return data


When I am running the following Curl request: curl http://127.0.0.1:8000/add_data -d 'data=Hello'

I am getting the following error:

{"detail":[{"loc":["query","data"],"msg":"field required","type":"value_error.missing"}]}

So I am sure I am missing something very basic, but I do not know what that might be.

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