Switch custom route decorator in url builder

@tarekziade thank you for merging my previous pull request #11.

Sorry, but I've found one more place with hardcoded url which I did miss in my previous pull request.

It make sense apply also this change at least in order to have more consistent code.

Unfortunately I was not able to fix all urls except socket.io, so this is still open topic.

Not sure that I can provide thix fix very soon. Just wanted let you know.