VM 204 API Reference

I am using Proppfrex and have found there the opportunity to control the VM204 with the comande: http://192.168.0.226:80/api/relay/toggle?relay=1&key=82xoZJL2V6eMkEEyip8hUyehSNDgVO43
Is it possible to give the vm204 a comande without response
Now when I give the command the browser keeps opening and that is not the intention.
So I would like a command that the vm204 does not respond in a browser.
Does anyone know a solution ???