code: func (h *ResponseHeader) DelClientCookie(key string) {
  	h.DelCookie(key)
  
  	c := AcquireCookie()
  	c.SetKey(key)
  	c.SetExpire(CookieExpireDelete)
  	h.SetCookie(c)
  	ReleaseCookie(c)
  }
docs: // DelClientCookie instructs the client to remove the given cookie.
  //
  // Use DelCookie if you want just removing the cookie from response header.