gistfile1.js

        Backbone.wrapError = _.wrap(Backbone.wrapError, this.wrapError)
    },

    wrapError: function(inner, onError, originalModel, options) {
        var onErrorWrap = function(model, xhr, options) {
            xhr.body = JSON.parse(xhr.responseText) || xhr.responseText

            if (!onError || !onError(model, xhr, options)) {
                if (xhr.status == 401) {
                    app.session.forget()
                    return app.authorize()
                } else {
                    console.error('unhandled sync error', model, xhr, options)
                }
            }
        }

        return inner(onErrorWrap, originalModel, options)
    },