FastApiReact-Demo/backend/app.py

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


@app.get("/hello")
@app.get("/api/hello")
def hello():
    return {"message": "Hello from FastAPI"}