Check if httponly cookie exists in Javascript

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You can indirectly check to see if it exists by trying to set it to a value with javascript if it can’t be set, then the HTTP Only Cookie must be there (or the user is blocking cookies).

function doesHttpOnlyCookieExist(cookiename) {
  var d = new Date();
  d.setTime(d.getTime() + (1000));
  var expires = "expires=" + d.toUTCString();

  document.cookie = cookiename + "=new_value;path=/;" + expires;
  return document.cookie.indexOf(cookiename + '=') == -1;
}

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