Twitter Creating App Failed due to invalid Web URL

I followed this tutorial
https://www.youtube.com/watch?v=qL3tZ6yHWMA

And when I reached the step on entering the Website URL, I got this error:

I want to be able to enter localhost only as this is just for school assignment purposes. Any ideas how to enter localhost as the website url?

Solution

What I did to solve the issue is just type in http://google.com , as long as it is a valid domain name, it should work.

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