API Location Header

In this gist: https://gist.github.com/787626 I explain a small problem I’m having at the moment. When a user makes an API request to /api/v1/projects.json the Location header for the resource is (in my opinion) incorrect. This should be pointing to the location in the API, i.e. /api/v1/projects/1, not /projects/show.

Is there a reason the behaviour is this way and if so, is there anyway I can change it?