Not that I know of. You'll need to tunnel through the proxy to really check the connection. I either do a proxy checker site to make sure nothing is leaking, or I just do the simple GET request against the site(s) I'm working with/on.
This will fall in the same lines at the LinesFromFile but instead of Use Only Once, you will use them Unlimited if they are changing every X minutes. You can also add a WAIT to the usage of milliseconds after adding the resource. 300000 = 5 minutes
