IPv6 binding support for the dev script

[tonybaloney]

No description provided.

[estee-tew]

https://stackstorm.slack.com/archives/community/p1473727725001089

[bigmstone]

I wonder. Should we listen on v6 and v4 by default? Having it be a binary option v4 or v6 feels weird. They're not usually mutually exclusive (in production).

[tonybaloney]

I tried that. Gunicorn broke. 

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On Tue, Sep 13, 2016 at 11:02 AM +1000, "Matthew Stone" notifications@github.com wrote:

I wonder. Should we listen on v6 and v4 by default? Having it be a binary option v4 or v6 feels weird. They're not usually mutually exclusive (in production).

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[bigmstone]

Did you try this?
http://docs.gunicorn.org/en/stable/settings.html#server-socket
Specifically: gunicorn -b 127.0.0.1:8000 -b [::1]:8000 test:app
Also, I do realize this is for a dev script and thus not all that important but would be good to know it works or breaks in dev.

[tonybaloney]

In production, all of the service bindings get proxies through NGINX anyway, so having local IPv6 bindings wouldn't make much difference (unless I guess for those people addressing the API locally). I figured I was in the minority wanting proper IPv6 bindings on any host address (not localhost) so that's why I didn't make it default. 
There was a thread on gunicorn about multiple bindings, some systems consider [::] to mean any host, 4 or 6, some don't. 

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On Tue, Sep 13, 2016 at 11:11 AM +1000, "Matthew Stone" notifications@github.com wrote:

Did you try this?

http://docs.gunicorn.org/en/stable/settings.html#server-socket

Specifically: gunicorn -b 127.0.0.1:8000 -b [::1]:8000 test:app

Also, I do realize this is for a dev script and thus not all that important but would be good to know it works or breaks in dev.

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[tonybaloney]

this is the article, its system dependent, so yuck. benoitc/gunicorn#1138

[bigmstone]

Yeah that's nasty. Also looks like the v6 addr will make it listen on both addresses on the platforms we support.

This seems to be the best way to approach it for now.

[bigmstone]

I'm +1 on the change. Will let someone else put eyes on it and merge.

[emedvedev]

+1. Shouldn't be a problem.