[web-devel] Yesod: Dynamic subdomains

Michael Snoyman michael at snoyman.com
Sat Aug 27 20:09:12 CEST 2011

On Fri, Aug 26, 2011 at 4:09 PM, "Timo B. Hübel" <t.h at gmx.info> wrote:
> Hi,
> I am building a Yesod web app which should support dynamic subdomains.
> I.e. a user registers as "foobar" on http://www.example.com and can
> afterwards access her content via http://foobar.example.com
> Is this possible at all? I am wondering, because the server name is
> somehow hard coded in Settings.hs as approot.
> If it is possible: How do I access the domain name in a handler function?
> Thanks!
> Timo

Hi Timo,

I've put up a cookbook recipe for domain-based routing[1]. It doesn't
require checking domain names in the handler function at all, but
instead uses the normal routing mechanism in Yesod. As a direct answer
to your question, to get access to the domain name, you'll want to get
the WAI request value via waiRequest[2] and then lookup the "Host"
header in requestHeaders[3].

Let's direct any follow-up discussion to the Yesod mailing list (CCed).


[1] http://www.yesodweb.com/wiki/Domain-based%20routing
[2] http://hackage.haskell.org/packages/archive/yesod-core/
[3] http://hackage.haskell.org/packages/archive/wai/0.4.1/doc/html/Network-Wai.html#v:requestHeaders

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