How to solve cors problem in Nuxt?

Question

Vue.js

Good evening! I write authorization through Steam on the back. At the front I write with Nuxt. Proxy set up. Added nuxtjs/proxy plugin to next.config.js in modules. I can send back requests from the front, but when I direct to the page for authorization in Steam, I get a cors error. Without nuxt there is no such error.

For the test, I cloned the passport-steam repository and wrote a link to the backing address on the front, which I use for the project with Nuxt. There was no mistake. The redirect to the Steam login page worked.

I think the problem is related to Nuxt, because without it everything works fine.