Sorry. That was a snarky comment. I did mention I'm running it behind nginx. It is behind a proxy with https. And even then I still can't have Chrome install the web app for my self hosted version.
EDIT: The issue was I had secured the page with basic http auth and that was preventing me from installing the web app. Disabled auth and it works now. Sorry again about the earlier comment.
So I had setup my nginx proxy to secure my self hosted version of wefwef by using basic http auth. I disabled it, and that fixed my issue.