Feature request: proxy support for TLS termination

Nowadays, browsers complain a lot when you try to download or upload a file when there is no TLS.

Can we in a first time allow another server (e.g. nginx) do the TLS termination?

For example https://windriver.nasqueron.org/upload is a proxy to the port 8080, so it can be used with TLS when woof -U uses the default port.

With -i support, proxy can refuse to work if for example we bind to 172.27.27.35 and the proxy wants to use 127.0.0.1.

proxies:
  nginx-8080:
    ip: 127.0.0.1
    port: 8080
    base_url: https://windriver.nasqueron.org/upload/

For example, it would print that URL in two scenarios:

1. the option -i is NOT used
2. -i 127.0.0.1