webhook with fastapi: I am not getting webhooks with Python

I am trying to get json data on my localhost. But I am getting a problem with Request.json.

main.py

from fastapi import FastAPI, Request
app = FastAPI()
@app.post("/webhook")
async def get_body(request: Request):
    print(request.json)
    return await request.json()

server.py

import requests
import json

webhook_url = "http://127.0.0.1:4000/webhook"

data = { 'name': 'test data', 
         'Channel URL': 'test url' } # myutube channels


r = requests.post(webhook_url, data=json.dumps(data), headers={'Content-Type': 'application/json'})

output

<function Request.json at 0x7ff2d0a878b0>

expected output

{
  "name": "test data",
  "Channel URL": "test url"
}