How to create Middlewares with FastAPI

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