Help - http
This is a network service that some systems provide. It is what web servers
and browsers use to communicate. If this service is running on a machine, it
means that machine has a web server running. This check is performed by
requesting the "/robots.txt" document - this is a common file that "web
spiders" look at to see if they have permission to scan through the server.
If this service is down, users will not be able to access web pages or programs
from that host.