How to properly set up dynamic routes in nuxt.js?

Question

Vue.js

I am making an application in nuxt.js. I use SPA mode (not SSR). I have dynamic routes, i.e.:
pages/posts/index.vue
pages/posts/_id.vue
I build the project, I place it on the nginx server.
Everything works well, except for direct access to /posts/id links. I get 404 or 500 error.
Is it possible to set up dynamic pages in SPA mode?
I will add post pages through the database and I want to have one template on the client.
Thanks in advance!