title: How sessions work in shiny-server?
body: <p>I am having some troubles in understanding how sessions work in the shiny-server. I assume that a session finishes when the user close the browser, however, by using the <code>print(session$isClosed())</code> in the server function I get a <code>FALSE</code> response at the beginning (so okay) and then when I close the browser nothing happens. Can anyone give me a clue about shiny-server sessions? I would want to store session specific plots to let the users download their plots only. </p>