from fastapi import FastAPI, HTTPException
from pydantic import BaseModel

class GreetingResponse(BaseModel):
    Hello: str

app = FastAPI()

@app.get("/", response_model=GreetingResponse)
async def greet_json() -> GreetingResponse:
    try:
        return GreetingResponse(Hello="World!")
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/health")
async def health_check():
    return {"status": "healthy"}
from fastapi import FastAPI

app = FastAPI()

@app.get("/")
def greet_json():
    return {"Hello": "World!"}