Allow public connections to local Ruby on Rails Development Server

problem ：

I am setting up a RoR development environment on a Windows machine. I am Windows Set up on the machine RoR development environment .I was wondering how I can set it up so a few friends of mine can have access to the web server and monitor the progress? I want to know how to set it , So that some of my friends can visit Web Server and monitor progress ？

It would only be 2 or 3 people connecting at anytime time max. At most, you can only connect 2 or 3 personal .

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Solution ：

Reference resources ： https://stackoom.com/en/question/cwqn