[web-devel] [Yesod] setUltDest' lost query param, it's right thing?

Michael Snoyman michael at snoyman.com
Mon Dec 20 18:06:22 CET 2010

This is the intended behavior, though I can appreciate what you're
asking for. Basically, it's not necessarily a good idea to
automatically resend POST parameters, since a POST operation is not
idempotent (ie, POST changes things), and we should follow the HTTP
standard on when things should change.

In theory, we could create alternative setUltDest-style functions that
also set the POST parameters, though we would also need to do
something about indicating that the request should be treated as a
POST rather than GET request after redirect. This may come back to
re-introducing the MethodOverride middleware, which is something Nubis
and I were discussing.


2010/12/20 いとうかつとし <cutsea110 at gmail.com>:
> setUltDest' which used in redirectLogin(which is called from requireAuth)
> set session reqGetParams, but not postParams.
> This means that , if there are a code as below, posted parameters are lost,
> aren't these?
> postFooR :: Handler RepHtml
> postFooR = do
>    (uid,_) <- requireAuth
>    (x, y) <- uncurry (liftM2 (,)) (lookupPostParam "x", lookupPostParam "y")
>    ....
>    defaultLayout $ do
>       ....
>       ....
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