[Python] Webhook listener in FastAPI raises 422 Unprocessable Entity error [duplicate]

I have a webhook listener that uses an APIRouter to designate the route for the application on the FastAPI server. The app should receive a POST request (expecting data in JSON format) and log this to the console. However, I am getting consistent redirects. I have attempted the following with curl:

curl -X 'POST' \
'http://127.0.0.1:8010/webhook' \
-H 'accept: application/json' \
-H 'Content-Type: application/json' \
-d '{"data": {"UK":"test"}}'


The listener:

import hmac
from logging import Logger, info
from fastapi import APIRouter, FastAPI, Header, Request, Response
from router.router1 import rout
from pydantic import BaseModel

WEBHOOK_SECRET = '123-456-789'

class WebhookResponse(BaseModel):
result: str

class WebhookData(BaseModel):
body: dict

app = FastAPI()
rout = APIRouter()

@app.get("/")
async def welcome() -> dict:
return { "message": 'Hello World!' }

def printLog(data):
info(f"Raw data: {data}")

@rout.post("/webhook", response_model=WebhookResponse, status_code=200)
async def webhook(
webhook_input: WebhookData,
request: Request,
response: Response,
content_length: int = Header(...),
x_hook_signature: str = Header(None)
):
if content_length > 1_000_000:
# To prevent memory allocation attacks
Logger.error(f"Content too long ({content_length})")
response.status_code = 400
return {"result": "Content too long"}
if x_hook_signature:
raw_input = await request.body()
input_hmac = hmac.new(
key=WEBHOOK_SECRET.encode(),
msg=raw_input,
digestmod="sha512"
)
if not hmac.compare_digest(
input_hmac.hexdigest(),
x_hook_signature
):
Logger.error("Invalid message signature")
response.status_code = 400
return {"result": "Invalid message signature"}
Logger.info("Message signature checked ok")
else:
Logger.info("No message signature to check")
printLog(webhook_input)
return {"result": "ok"}

app.include_router(rout)


Curl prints out the following error:

{
"detail": [
{
"loc": [
"body"
],
"msg": "value is not a valid dict",
"type": "type_error.dict"
}
]
}


With the following printed to console:

INFO: 127.0.0.1:50192 - "POST /webhook/ HTTP/1.1" 422 Unprocessable Entity

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