this will work: http://paprikka.github.io/le-bat/#/preview/asdadasda
I have a solution but I don't know if it will help you. From Angular documention http://docs.angularjs.org/api/ng.$location $location has a function search(search, paramValue)
To pass the parameter:
parameter = encodeURIComponent url
$location.search({ yourURLParameter: parameter }).path('/preview')
To read the parameter:
url = decodeURIComponent $location.search().yourURLParameter
Of course you need to inject $location dependency