When a request hits a handler, it will already have gone through the middleware, so it only seems possible to alter how the response is handled at that point. If you want different middleware for different routes, that is something that must be handled at the routing level, so it seems out of the scope of WAI. But if you explain your use case on the Yesod mail list we can try and come up with a more convenient solution. I do have a WAI middleware that checks routes that might benefit from this. On Thu, Jul 25, 2013 at 10:20 AM, Robert Lee wrote:

Is it possible in the present design to change middleware modules at the level of a handler?

On Tue, 2013-07-23 at 13:04 +0300, Michael Snoyman wrote:

...

Some of you may have seen the brief interchange between Kazu and myself regarding ResourceT in WAI. Let me give a very brief synopsis of the situation: * In order to allow WAI applications to acquire scarce resources like file handles in an exception-safe way, WAI actions all live

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