Dynamic Web URL and On-Premise Gateway

Just an update, I have reworked the m code, after reading some documentation on Relative Path and Query:

    Source = (pID as text) => let
            Source = Web.Page(
                Web.Contents(
                    "http://servername/sites/sharepointname/",
                    [
                        RelativePath = "_layouts/15/versions.aspx",
                        Query = [list="listname", ID = pID]
                    ]
                )
            )

I don't have access to diagnotics, but will try and have IT enable so that I can see what Power BI resolves the URL as.

After making the changes, the Power BI service will still not refresh the dataset. I am pretty confident that the m code is fine now.

Not having a setup screen to look at, if the gateway is configured for "http://servername/sites/sharepointname/", what settings or options need to be toggled for a standard mode gateway?