Allow configuration of the bind address

[cyyynthia]

Describe the Suggestion

For my server I use a nginx proxy for all user-facing websites (including for example dynmap) and I'd like to also put the track map behind it. The rationale is that it a) allows me to access it via a clean URL without ports b) allows me to serve it via https c) reduces attack surface by having nginx sit in front of the internet (you never know when something gets a vulnerability!) d) allows me to set ratelimit rules, easier threat protection via fail2ban/crowdsec/....

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Additional Context

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[centmeteenvin]

I have a kind of way of setting up nginx to pass to the train maps but it is kind of ugly.

    location /train {
        # alias;
        proxy_pass http://localhost:3876/;
    }

    location /api {
        proxy_pass http://localhost:3876/$uri;
    }

    location /assets {
        proxy_pass http://localhost:3876/$uri;
    }

I am not the biggest fan of this solution as it consumes 3 location url's on the hostname. The reason I did this is, is because the scripts will call hostname/api and hostname/assets. If this can be fixed it would be nicer.