Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request. signalR dotnet code example

Example: viacep Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

npm install --save cep-promise

...

import * as cep from 'cep-promise'

cep('05010000')
  .then(console.log)