An answer here View / See / Read cookies in Google Chrome suggested this extension. (I have since found it's not a good extension and very problematic, as i've commented there, but anyhow)
Why does Chrome's "EditThisCookie" extension, seem to list some cookies as 'session' with an expiry date?
I've read that session cookies don't have an expiration date,
" If there is no expiry set on the cookie, then it is a session cookie and will live as long as the browser is open"
And https://en.wikipedia.org/wiki/HTTP_cookie#Session_cookie "session cookies do not have an expiration date assigned to them, which is how the browser knows to treat them as session cookies."
But info provided by EditThisCookie seems to contradict that.
I installed the Chrome extension, EditThisCookie I notice that when I go to this website (a website that displays nothing, it's a very plain website, but it sets two cookies).
And I view the cookies
This cookie too from that website, shows as session and with an expiry date
With most websites, cookies that have an expiration date, don't show as session cookies in EditThisCookie, e.g. see this cookie from google.com
What might it be about the two cookies on https://infinite-shelf-13133.herokuapp.com/ to show in EditThisCookie as session cookies. Whereas even with other websites cookies don't.
I made that website with rails and a line
cookie[:abc]="zzz" and uploaded it to heroku. Just to understand cookies a bit better. And I ran into that question.