What is SockJSAdapter and why it is running endles

问题:

I have a Shiny-app hosted in Ubuntu, attached is the current snapshot of processes running As you see a significant chunk of memory is being consumed by something called SockJSAdapter which is related to Shiny-server. I have noticed that this process starts when I run my App in Browser and it keeps running even after I close that App in Browser.

Can someone shed more light what this process is, and why it keeps running even after I close the App? Do I need to do something in my Shiny-app (ui.R or server.R) so that this process will be killed just the moment user closes the App?

Shiny-server version I am using:

apt-cache showpkg shiny-server
Package: shiny-server
Versions:
1.5.6.875 (/var/lib/dpkg/status)
 Description Language:
                 File: /var/lib/dpkg/status
                  MD5: 5692122708280493808d4d49f42a0475


Reverse Depends:
Dependencies:
1.5.6.875 - libc6 (2 2.7) r-base (2 2.15.1)
Provides:
1.5.6.875 -
Reverse Provides:

Thanks for any pointer.