Как создать и прочитать cookie через http на javascript?

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function setCookie(name, value, days) {
  let expires = "";
  if (days) {
    const date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    expires = "; expires=" + date.toUTCString();
  }
  document.cookie = name + "=" + (value || "") + expires + "; path=/";
}

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function getCookie(name) {
  const nameEQ = name + "=";
  const cookies = document.cookie.split(';');
  for(let i=0;i < cookies.length;i++) {
    let cookie = cookies[i];
    while (cookie.charAt(0)==' ') cookie = cookie.substring(1,cookie.length);
    if (cookie.indexOf(nameEQ) == 0) return cookie.substring(nameEQ.length,cookie.length);
  }
  return null;
}