AutomateIT behaviour

If there is anyone using Automateit that might explain something to me.

I created a rule to turn off a switch in HE when my phone battery goes above a certain amount. Using this through Maker. I tested the URL in a browser before making the rule and the URL works correctly.

In AutomateIT in the action I put the URL. If I set it to open a browser when it executes then it works fine. If I set it to NOT open the browser but only perform a GET then it doesn't work. The rule runs, but it doesn't turn the switch off.

Just wondered if anyone had any ideas on this?