main.py

import asyncio
from typing import Union

from fastapi import FastAPI
from fastapi.encoders import jsonable_encoder
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel

app = FastAPI()
# add CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)


class Item(BaseModel):
    name: str = "Foo"
    price: float = 10.5
    is_offer: Union[bool, None] = None


@app.get("/")
def read_root():
    fake_dict = {"foo": "bar"}
    return jsonable_encoder(fake_dict)


@app.get("/hello")
async def hello():
    await asyncio.sleep(1)
    return {"message": "Hello World the second time"}

@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}


@app.put("/items/{item_id}")
def update_item(item_id: int, item: Item):
    return {"item_name": item.name, "item_id": item_id}