Putting the webui behind a base url

Hi folks,

I think this might be more of an nginx question rather than an OMV one, but I figured I'd ask here anyway.

I have an nginx instance on another machine, which is basically the gateway to my network.

All externally facing services pass through that.

I want to add OMV's webui to that list.

So I added this to the gateway

location /foo {
proxy_pass http://192.168.x.y:80/; #OMV server IP
}

As expected, this leads to a myriad of errors like:

The resource from “https://redacted/extjs6/classic/theme-triton/resources/theme-triton-all.css” was blocked due to MIME type (“text/html”) mismatch (X-Content-Type-Options: nosniff).
The resource from “https://redacted/css/theme-all.min.css” was blocked due to MIME type (“text/html”) mismatch (X-Content-Type-Options: nosniff).
The resource from “https://redacted/js/js-overrides.js” was blocked due to MIME type (“text/html”) mismatch (X-Content-Type-Options: nosniff).

So my question is, what do I need to do to get OMV to accept its new base url of /foo so that it asks for https://redacted/foo/js/js-overrides.js instead?

Is this just an nginx configuration issue? Do I need to config something in OMV itself?

Or I am going the wrong way about with this?

Is there a better way to achieve what I want?

I am very much a noob when it comes to nginx and the like.

Thanks!