code: func CacheFasthttpFunc(bodyHandler fasthttp.RequestHandler, expiration time.Duration) fasthttp.RequestHandler {
  	return CacheFasthttp(bodyHandler, expiration).ServeHTTP
  }
docs: // CacheFasthttpFunc accepts two parameters
  // first is the fasthttp.RequestHandler which you want to cache its result
  // the second is, optional, the cache Entry's expiration duration
  // if the expiration <=2 seconds then expiration is taken by the "cache-control's maxage" header
  // returns a fasthttp.RequestHandler, which you can use as your default router or per-route handler
  //
  // All type of responses are cached, templates, json, text, anything.
  //
  // You CAN NOT add validators with this function