How to create Middlewares with FastAPI

from fastapi import FastAPI, Requestfrom starlette.responses import JSONResponse, Responseapp = FastAPI()@app.middleware("http")async def verify_user_agent(request: Request, call_next):    if request.headers['User-Agent'].find("Mobile") == -1:        response = await call_next(request)        return response    else:        return JSONResponse(content={            "message": "we do not allow mobiles"        }, status_code=401)@app.get('/')def index(request: Request, response: Response):    return {'message': 'ok'}

from fastapi import FastAPI, Requestfrom starlette.responses import Responsefrom fastapi.middleware.wsgi import CORSMiddlewareapp = FastAPI()app.add_middleware(    CORSMiddleware,    allow_credentials=True,    allow_methods=["*"],    allow_headers=["*"],)@app.get('/')def index(request: Request, response: Response):    return {'message': 'ok'}