Handling 404 on axios call in mounted

Depends upon the context really. I've always liked axios interceptors, as you can cool things like:

axios.interceptors.response.use((response) => {
    return response;
}, function (error) {
    // Do something with response error
    if (error.response.status === 401) {
        console.log('unauthorized, logging out ...');
        auth.logout();
        router.replace('/auth/login');
    }
    return Promise.reject(error.response);
});

tried to put this in app.js

window.axios.interceptors.response.use((response) => {
    return response;
}, function (error) {
    if (error.response.status === 404) {
        console.log('error')
        this.$router.push({
            name: '404'
        });
    }
    return Promise.reject(error.response);
});

it logs to console however does not redirect, highly likely I set up router wrong way here.