Why is Proxy Nuxt not working on heroku?

Question

API

Followed a project with coursehunter about creating a blog on Nuxt + Laravel API.
front and back were on different domains.
the front was knocking on the backend at the address / api
Locally everything worked fine. (because cors for laravel was configured in the course)
I uploaded one application to heroku frontend, and another backend.
I registered all the keys for laravel and nuxt, everything worked. But the CORS error began to take off.
ok googling, i found info about nuxt
proxy. I connected it, but now the application doesn't open at all. There is the following error in the heroku logs:

If you remove the proxy in nuxt.config.js and leave just the baseurl in axios, this error is gone
This is what my nuxt.config.js looks like now:

modules: [
    // Doc: https://axios.nuxtjs.org/usage
    '@nuxtjs/auth',
    '@nuxtjs/axios',
    '@nuxtjs/pwa',
    '@nuxtjs/proxy'
  ],
  axios: {
    proxy: true
  },

  proxy: {
    '/api/': { target: 'https://api-for-blog.herokuapp.com/api', pathRewrite: {'^/api/': ''},changeOrigin: true }
  },
  auth: {
    strategies: {
      local: {
        endpoints: {
          login: { url: "login", method: "post", propertyName: "meta.token" },
          user: { url: "user", method: "get", propertyName: "data" },
          logout: { url: "logout", method: "post" },
        },
      }
    },
    watchLoggedIn: true,
    rewriteRedirects: true
  },