Guest user calls to extend_session every second if LFR_SESSION_STATE cookie value can not be got

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 6.2.X EE, 7.0.X EE, Master
• Fix Version/s: 6.2.X EE, 7.0.0 DXP FP13, 7.0.0 DXP SP3, 7.0.3 CE GA4, 7.0.X EE, 7.1.X, Master
• Component/s: Frontend Infrastructure
• Labels:
  • 62-ee-sp19
  • liferay-digital-enterprise-70-sp3
  • liferay-fixpack-de-13-7010
  • liferay-fixpack-portal-143-6210
• Branch Version/s:
  7.0.x, 6.2.x
• Backported to Branch:
  Committed
• Fix Priority: 3
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/47763
• Bug Type: Performance

If you disable cookies in your browser and access to any Liferay page, without sign in (in fact, you can not, because you need enable cookies for that), you'll see how every single second a POST to /c/portal/extend_session is made.

Steps to reproduce
1.- Disable cookies in your browser
2.- Access to any page in your Liferay Server
3.- Open network tab in browser console

Expected result
You can see normal traffic

Actual result
Every second there is a request to /c/portal/extend_session.

Root cause
This is happening because we use the cookie LFR_SESSION_STATE_

{userId}

to store the timestamp of the moment when the session started, and later (every second according to the interval we defined in session.js) we use that value to figure out how long the session has been active. If we can not get the value, we set default value: 0, and that provokes the recurrent calls to extend_session until you close the browser.