I want to launch metabase application on relative url.
For example https://myapps.com/metabase
How do AI configure jetty to respond at relative urls
If you look at the PR where support for this got introduced https://github.com/metabase/metabase/pull/4740#issue-220588902 it seems the recommended approach is just to place a proxy in front of Metabase. There are examples over there using either Caddy or Nginx.
Followed the nginx procedure, got the application running on /metabase, but it is not able to share links on /metabase and having some problems in fetching assets files
Sorry have no experience with this myself. 
Only thing I can think of is you might have to set the site URL under Admin … other than that only thing might be to read up. If there are assets still missing my best guess it could be a regression since it got implemented - so you should file a GH issue - or even a PR 
. Not sure there are a lot of users of this particular feature so YMMV…