No way to hide Safari. At least not following the Apple guidelines.
If you took the jailbreak route, you could look at a command line application that would run a URL request.
Example:
You want to active the page:
http://site.com:9001/index.php?action=lights_on
You can have your application just run a command line script: wget --spider
http://site.com:9001/index.php?action=lights_on
It will pretty much do what you want. Just make sure you require wget with your package. Again, this will only work on a jailbroken phone.