Browser showing old version of web page

Xojo 2018
I have been using an HTMLViewer (set to ‘WebKit’) to display a web page from my site about updates.
However, what it displays seems to be heavily cached in a compiled app.
So much so that what it is displaying from an installed app is data from about 2 months ago.
I have stepped through the code and know that the url it is displaying is correct (copied from debug window- paste into ‘real’ browser address bar, see up to date page)

Does the HTMLViewer maintain its own cache?
if so, how can I force it to get new data?

As far as I remember there was something like “cache policy” in older versions of MBS to make sure that the browser doesn’t cache anything.