clone() {
        let response = new FileResponse(this.filePath);
        response.exists = this.exists;
        response.status = this.status;
        response.statusText = this.statusText;
        response.headers = new Headers(this.headers);
        return response;
    }
Clone the current FileResponse object.
@returns {FileResponse} A new FileResponse object with the same properties as the current object.