main.py

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

app = FastAPI()


class Numbers(BaseModel):
    a: int
    b: int


@app.get("/")
def read_root():
    return {"message": "Hola Mundo"}


@app.post("/")
def sum_numbers(numbers: Numbers):
    result = numbers.a + numbers.b
    return {"result": result}