Do it yourself
This application is a very simple and easy to build application. You have learned how to create a simple application with some limited features. There can be many additions made to this application and it can be made more powerful. Let's give you some tips on features that you can develop.
Input username
Whenever the user visits the URL, the application asks for the username. The username that is inputted is displayed in the top-left corner of the screen. I think this scenario is quite easy to build. I will leave its implementation to you. It is easy up to the point that we want to show the list of users, which is basically our next scenario.
The list of users
Make a button which will show you a list of users that are currently online. ...
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