[Feature Request] Allow host on a subpath

[christaikobo]

Right now this project is intended to be hosted at / of a domain or subdomain.

A lot of people (myself included) likes to host services under subpaths like /mailarchiver.

This practice is very popular in self hosted community, it reduces the number of subdomains to manage, reduces certificates and DNS to manage, also has some added privacy benefit because any observer on the line cannot see the subpath in https traffic. (but they can see the subdomain, so if you got 20 subdomain for 20 services it is very obvious)

The problem is that when hosting under a subpath all the resources are not loaded correctly, like the webpage is still pulling static assets from mydomain.com/static/*. The standard practice is usually to add a environmental variable base_url/http_root or something similar so that all assets and page routes are correctly prepended with the subpath.

Thank you for this very useful project!

[fREAST]

+1 this would be really useful