Explanation about 'nshttpd' internal services up on ports 80.

After a recent upgrade from 13.0 build 90.11 to 13.1 build 48.47, I noticed a new internal service was installed. "set service nshttpd-gui-x.x.x.x -80 -cip ENABLED" Is this a necessary service and what is it's purpose? If it's not needed, I'd like to disable since it's using port 80...