When accessing API (RAILS) from the front end (NUXT) to AXIOS, it becomes a CORS error, and I am wondering how to set Rails's CORS.

As of the following source code, I tried some, but it was a similar CORS error.
If this happens, should I fix the IP of the container?
It is saved when you can teach you.

browser error

Access to XMLHTTPREQUEST AT 'HTTP://127.0.0.1: 5000//27.0.0.1: 5000 //xxx' from Origin 'http: //localhost: 7000' Has Been Blocked by Cors Policy: Response to Preflight Request Doesn't PASS Access Control Check: No 'Access-Control-Allow-Origin' Header is Present on the Requested Resource.

Source Code 
API_RAILS /CONFIG /INITIALIZERS /CORS.RB
Rails.Application.Config.Middleware.Insert_before 0, Rack :: Cors DO
  Allow DO
    Origins 'NUXT container name', 'localhost', 'localhost: 5000', '127.0.0.1', '0.0.0.0', '0.0.0.0: 5000'
    Resource '*',
      Headers :: Any,
      Methods: [: get ,: post ,: put ,: patch,: delete,: options: Head]
  END
END

NUXT.CONF.JS
AXIOS: {
    BaseUrl: 'http: //api_rails: 5000 /API /',
    BrowserBaseUrl: 'http://127.0.0.1: 5000/API/',
}

Environment 
Rails Container External Port 5000 

Rails Container Internal Port 3000
NUXT Container External Port 7000 

NUXT Container Internal Port 3000
Both server hosts start with 0.0.0.0