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Relying Party iFrame

This is only a sample of a Relying Party iFrame that could be used. Refer to the pseudo code for Relying Party iFrame on the OIDC specification site.

Comments have been added on specific lines to highlight actions items for implementation/configuration.

<html xmlns="">
<head><title>OpenID Connect RP Session frame</title></head>

  var targetOP = ""; //url of the OP
  window.addEventListener("message", receiveMessage, false);

  var scheduledCheck;

  window.onload = function () {
    // Check shortly after onload
    setTimeout(checkStatus, 2000);
    // Do not forget to deregister scheduled callback using clearInterval(checkStatus)
    scheduledCheck = setInterval(checkStatus, 1000*20); //Every 20 seconds

  function getCookieValue(cookieName) {
    var name = cookieName + "=";
    var cookies = document.cookie.split(";");
    if (!cookies) {
      return null;
    for (var i = 0; i < cookies.length; i++) {
      var cookie = cookies[i].trim();
      if (cookie.indexOf(name) === 0) {
        return cookie.substring(name.length, cookie.length);
    return null;

  function checkStatus() {
    var client =  "oidc"; //this should be the clientId that is configured on the OP
    //You can name this cookie whatever you want, it should have been stored in a cookie after the Authentication response so it is accessible here
    var sessionState = getCookieValue("session_state"); 
    var text = client + " " + sessionState;
    var iframe = window.parent.document.getElementById("opif"); //this should be the id of the OP iframe you set when including them on the main page
    iframe.contentWindow.postMessage(text, targetOP);

  function receiveMessage(event) {
    if (event.origin !== targetOP) {
      // Origin did not come from the OP; this message must be rejected
    if ( === "unchanged") {
      // User is still logged into the OP, don't need to do anything
    } else {
      // Detected a change at OP
      // Perform authentication with `prompt=none` to check authentication status