text: from fastapi import FastAPI
  from fastapi.middleware.trustedhost import TrustedHostMiddleware
  
  app = FastAPI()
  
  app.add_middleware(
      TrustedHostMiddleware, allowed_hosts=["example.com", "*.example.com"]
  )
  
  
  @app.get("/")
  async def main():
      return {"message": "Hello World"}
  