This is a good question. Right now, Yesod specifically does *not* support this, essentially because it is non-RESTful (two URLs for the same resource). In order to achieve this, the type signature for approot would need to be modified to something like: approot :: master -> Request -> String This actually introduces some other issues, such as making it difficult for people to generate URLs outside of the context of a specific request. There *is* a hack you could use right now that will work, and I'm leaning towards recommending it. Essentially, create your foundation type as: data MyApp = MyApp { dbpool :: DBPool, isHTTPS :: Bool } Then in your withMyApp function, you could write something like: withMyApp f = do withDBPool $ \pool -> do http <- toWaiApp $ MyApp pool False -- make sure to call toWaiApp before you receive a request, otherwise you will keep reloading encryption keys at each request, which will kill performance https <- toWaiApp $ MyApp pool True f $ \req -> (if Network.Wai.isSecure req then https else http) req Then you would write approot as: approot app = (if isHTTPS app then "https" else "http") ++ "://www.mydomain.com" Michael On Wed, Feb 2, 2011 at 12:04 AM, Katsutoshi Itoh wrote:

Hi I'd like to host application for http and https. I set up apache and use rewrite rules. In this case, how do i write approot of Yesod instance? when client request by http://www.foo.com/a/b/c/, approot must be http://www.foo.com, one the other hand, when client request by https://www.foo.com/a/b/c/, approot must be https://www.foo.com. how do i write?

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