[Haskell-cafe] Binding a socket to all interfaces

Johan Tibell johan.tibell at gmail.com
Wed Sep 21 08:49:02 CEST 2011

Hi Michael,

Kazu recently fixed this (in the stable branch on GitHub) in
Network.listenOn but perhaps the more basic Network.Socket.listen should
also be changed. Lets discuss what's the right thing to do in this thread.

On Wed, Sep 21, 2011 at 1:38 PM, Michael Snoyman <michael at snoyman.com>wrote:

> Hi,
> One of the recurring issues that comes up in Warp is binding to IPv4
> versus IPv6 hosts. Our current code is available at [1]. It was
> updated to look like that in this commit [2] in order to support both
> IPv4 and IPv6 hosts by default. However, now it seems than on Debian
> and FreeBSD, it *only* responds to IPv6 by default[3][4]. I'm frankly
> stumped at this point on how to have our cake and eat it too.
> Does anyone have an idea of the correct incantation to get Warp to do
> the Right Thing(tm) here? And if not, is there any advice on sensible
> default behavior? I'm considering allowing a few special host values:
> * "*" (default, what we have now): Make this bind to IPv4
> * "ipv4": Again, bind to IPv4. Guaranteed not to change in the future
> * "ipv6": Bind to IPv6.
> Michael
> [1]
> https://github.com/yesodweb/wai/blob/master/warp/Network/Wai/Handler/Warp.hs#L119
> [2]
> https://github.com/snoyberg/warp/commit/02c1396c86e3fceb48cbe7df58cb631c804e24d4
> [3] https://github.com/snoyberg/warp/issues/9
> [4]
> http://stackoverflow.com/questions/7486257/yesod-devel-server-only-listening-on-ipv6
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