Learning React - urls in chapter 11 donlt work

The following urls in the second editoin of the Learning React book in chapter 11 do not work

https://www.kirupa.com/react/ lifecycle_example.htm

Please provide the correct URLS

They seem to work for me?
Working on codepen here:
check the html file, links are the same for the react library.

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What specific error are you seeing? Is it a 404/resource not found?