Python - LocalProtocolError("Illegal header value ...")

FastAPI에서 response header에 set-cookie를 설정할 때, 아래와 같이 Illegal header value 에러가 발생했습니다.

LocalProtocolError("Illegal header value b'TEST=1; expires=Fri, 26 Sep 2021 06:04:21 GMT; Max-Age=31536000; path=/ '")

namespace WebApplication1
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            HttpCookie cookie = new HttpCookie("test", "1");
            cookie.Expires = DateTime.UtcNow + TimeSpan.FromSeconds(5);
            cookie.Path = "/ ";

            this.Response.Cookies.Add(cookie);
        }
    }
}