Dispatch.cgi, dispatch.fcgi, dispatch.rb not present in Public folder

I’m doing a series of ruby on rails tutorials and it got to a part
where i need to edit the following files that should be automatically
inside the public folder: dispatch.cgi,dispatch.fcgi,dispatch.rb but I
have none of these inside my public folder. Is there a reason for
this? And how can i change it so they are back

The only files in my public folder at present are

404.html 500.html 422.html images javascripts stylesheets favicon.ico
index.html robots.txt

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