Refresh Web Data Source

I am confused about refreshing web data sources. I used to be able to set up a refresh schedule without a personal gateway. Now when I publish something to the Power BI service, it treats the web data source as an on prem data source. https://powerbi.microsoft.com/en-us/documentation/powerbi-refresh-desktop-file-onedrive/ The above address says that a web data source is an on prem data source. The below address says, "A personal gateway is not required in order to refresh datasets that get data only from an online data source." https://powerbi.microsoft.com/en-us/documentation/powerbi-personal-gateway/ So which is "Web"? An online source or an on prem source? Thanks for your help.