This article shows the very basic application set up required to host a rails application with Angular 5 framework Angular - Is a modern javascript framework for building web application in javascript,html and type script(super script of javascript) Such kind of working will have two separate servers. One server will be hosting rails part and the second server will be hosting the angular part. The HTTP request raised will have a different origin header, than that of the server hosted, and hence the request will fail. A cross-origin HTTP request (CORS) is used when the request is raised