code: func (h *ResponseHeader) VisitAllCookie(f func(key, value []byte)) {
  	visitArgs(h.cookies, f)
  }
docs: // VisitAllCookie calls f for each response cookie.
  //
  // Cookie name is passed in key and the whole Set-Cookie header value
  // is passed in value on each f invocation. Value may be parsed
  // with Cookie.ParseBytes().
  //
  // f must not retain references to key and/or value after returning.