Comment by falcolas

You can dictate that a service is running, and it will ensure that the service is running. You can also set up more advanced HTML checks in at least some frameworks[1] to ensure that the contents are being served correctly.

[1] http://docs.ansible.com/get_url_module.html & http://docs.ansible.com/uri_module.html for ansible, I'm fairly certain you can build up something similar for puppet and chef, though I haven't done it myself.