[Python] Picking up the body post request from fastAPI server

I wonder how to pick up the body post request from a fast api server in order to transform this body to making a new body to post another server.

But it does not seem like in express javascript when we could reach the body by using the expression req.body.

I have searched in the documentation but I have not found any example.

Is there any equivalent for this in python fast api ?

EDIT :

here is my current code. After some researchs, it seems that we have to create some class to parse the body but I am not sure...

import json
from random import random

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


class Body(BaseModel):
title: str

@app.post("/posts/")
async def posts(body: Body):
number=random()
title = body
posts[number]={
"msgtype":"PostCreated",
"data":{
"id": number,
"title": title,
}
}
return posts[number]

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