As far as I know, LoadFromFile isn't reporting any log messages on its own.
A utility to visualize how input urls would be routed, and maybe even test that route, would be nice But today that is not available.
I recon inputs would be the url of the html that gets rewritten, and then configuration that manipulates routing/domain authorization. Then one would hand it some html with to-be-fetched and rewritten resource links, and the tool would show log lines that indicate what happened with respect to https(s)fetching, ip resolution, and/or LoadFromFile.