Build a full stack app that is functionally similar to this: https://little-url.herokuapp.com/.
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User Story: I can pass a URL as a parameter and I will receive a shortened URL in the JSON response.
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User Story: If I pass an invalid URL that doesn't follow the valid http://www.example.com format, the JSON response will contain an error instead.
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User Story: When I visit that shortened URL, it will redirect me to my original link.