func wantsHTML(r *http.Request, m *mux.RouteMatch) bool {
mostAccepted := common.MostAccepted(r, "text/html", "Accept")
return mostAccepted == "text/html" || mostAccepted == "*/*"
}
func wantsJSON(r *http.Request, m *mux.RouteMatch) bool {
return common.MostAccepted(r, "text/html", "Accept") == "application/json"
}