Enable connecting over ipv6

[sasikumar87]

Changes to enable connecting over ipv6

[maltoe]

Hey @sasikumar87

may I ask what do you need this for?

[sasikumar87]

Hi @maltoe, I am trying to deploy chrome on a fly.io machine in private mode. Fly machine's ipv4 is always public. To make it private, I must use IPv6.
Ref : https://fly.io/docs/networking/app-services/#private-flycast-apps-2

Though I tested it further and found websokex also needs change at :gen_tcp.connect to make websockets connect over ipv6. https://github.com/Azolo/websockex/blob/v0.4.3/lib/websockex/conn.ex#L156

So the changes in this PR alone is not sufficient without websockex changes.

[sasikumar87]

I'll close this for now, as websockex also needs change.

[walter]

@sasikumar87 I'm not seeing a PR or issue on websockex with the required change for ipv6. Is there something in the works to support it?

[sasikumar87]

@walter I just raised an issue in websockex Azolo/websockex#131 .