Intercept and manipulate request of file in EmbedIO with staticfolder

Question

I'm triying to serve static html pages using embedIO 3.0 from a c# (MAUI app)

While everything works great, i need to intercept some html files by name that exists in the staticfolder, for manipulate and serve to the browser.

Those files are encrypted and need to decrypt and serve to the browser.

Have tried to use FileRequestHandler of FileModule, or overriding OnRequestAsync.

Any example or help will be apreciated.