Fixed handling of multiple puma endpoints and of wildcard IP addresses

[jabbrwcky]

Improved the handling of multiple upstream endpoints and of app servers configured to use "0.0.0.0" as IP address.

[seuros]

why are we replacing 0.0.0.0 by 127.0.0.1 ?

[jabbrwcky]

Because 0.0.0.0:1234 is not a valid IP address for nginx to talk to. It is a "wildcard" that causes puma to bind to all available network interfaces on port 1234 including the loopback interface. (e.g.: Host interfaces: 192.168.1.34, 10.0.0.34 and of course 127.0.0.1, passing tcp://0.0.0.0:1234 will bind puma to 192.168.1.34:1234, 1.0.0.34:1234 and 127.0.0.1:1234)

So the only thing guaranteed is that puma will be listening on 127.0.0.1 if we see it in a ssl:// or tcp:// endpoint definition for puma. Any other address will be used verbatim.

[seuros]

Fair enough.

[seuros]

Thank you