In parse.com I use hosting > Custom Domains > Web HostingWeb Hosting
"To enable content hosting, choose a unique ParseApp subdomain for your app. The name may consist of 3 to 20 alphanumeric characters and dashes, and may not start or end with a dash. Content from your public directory will be served to users that visit this subdomain.""
Then I just need to create a Public folder and everything inside get publish.
How can I do the same in back{4}app