See if this helps:
My findings in quest to preview and test website dev simple html basic stuff on iOS locally since a few years back Apple deciding to ruin the ability to launch Apache built in on MacOS plus made it apparently impossible to test on IOS iPad local pages or run a whole standard mini site offline.
I'm using WorldWideWeb by icon factory to preview and test website dev simple html basic stuff on iOS locally
https://blog.iconfactory.com/2022/06/worldwideweb-part-2/
see also - I'm not fully sure if Vapor is the swift server or the framework to build one smh
https://vapor.codes
https://www.raywenderlich.com/31498014-running-a-web-server-on-ios-with-vapor
BARRETTBUTLER
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Update: I did develop a lead on solution in another forum - gets me 99% there on initial 5 minutes of rough testing .
Of course the app would have to be installed for all motivated users plus step by step screen shot style instructions...
It is a free app , stunningly so, thanks Craig Hockenberry
https://blog.iconfactory.com/2022/06/worldwideweb-part-2/
https://apps.apple.com/ch/app/worldwideweb-mobile/id1623006812?platform=ipad