I need this so much!

Same here, this is a precious feature, great work !

MEEERGE I NEED THIS

I really need this...in case containers in development env different to env production

+1

This would be great to have. Would love to run unifi-controller on a reverse proxy but requires multiple ports exposed.

Thanks @BobSilent for the code! 🎉 I couldn't wait for it to be merged so I built my own image with docker-gen binary compiled from nginx-proxy/docker-gen#319, but I was getting this during proxy container startup:
dockergen.1 | 2020/05/27 21:22:38 Unable to parse template: template: nginx.tmpl:266: undefined variable "$defaut_external_http_port". I was able to get further by hard-coding "80" instead of the undefined variable at lines 266 and 268 of nginx.tmpl, but then I'm getting this error instead: dockergen.1 | 2020/05/27 21:25:12 Unable to parse template: template: nginx.tmpl:422: unexpected EOF. Do you have any idea what might have gone wrong?

Never mind, figured it out 😤 There's a typo in the variable name (mind the missing l in $defaut_external_http_port) and also there seem to be some "unclosed" {{ range }} blocks that produce the unexpected EOF errors. I also found that I probably need to wrap the whole server block with it (I'm not an nginx expert though so keep that in mind). Anyway, here is a gist with my working template: https://gist.github.com/lusk/25fdf859fd92ab4ea8f702911fc896fc
Thanks again for the code @BobSilent 👍

Hi @lusk & @BobSilent,
I really like your pull request and I need on my system. Before compiling and building myself: Do you have a docker image for that on docker hub?
Thanks in advance.

Superseded by #2434