Any more details (or links) to share? I read the entire subfolder topic and the only thing Sam talked about was a new alias for Rails in docker
Edit: Did check that long polling is set (no ending slash) per this:
https://meta.discourse.org/t/message-bus-doesnt-respect-subfolder/31119/3?u=jomaxro
Edit 2: No CDN in play here, all on local hardware.
This might be itâŚseems I do need an ending slash here, unlike app.yml which doesnât want that slash. I agree with the points made here:
https://meta.discourse.org/t/a-small-story-about-long-polling-base-url/25781/2?u=jomaxro
https://meta.discourse.org/t/a-small-story-about-long-polling-base-url/25781/3?u=jomaxro
Seems that a PR wasnât created a 18 months ago to fix this 
I will report back when there is a new update to pull.
Edit: Unfortunately this did not fix it @sam - still no progress bar or console text on /admin/upgrade.
Edti 2: Looks like mini_profiler also doesnât respect subfolder install- looks like that is Samâs tool too.
Any success reproducing the /admin/upgrade progress bar issue in subfolder installs?
As far as I know, nobodyâs tried to.
Going to bump this againâŚwith the recent Ember update we had a number of plugins to update along with Discourse. With the progress bar not working, we had to keep refreshing the page to see if each update was complete, making the process even longer. Would really appreciate seeing this lingering subfolder issue resolved 
.
Definitely agree, just found this out myself. It looks like the long polling base url isnât getting populated correctly on the upgrade pages.
(If it doesnât conflict with any of your other routes, you can add a quick hacky workaround route for /message-bus, but this is obviously a short-term solution)
Hey @nightpool, discussion has been moved to a proper #bug topic.
https://meta.discourse.org/t/subfolder-issues/53972?u=jomaxro