User Story #1: I can POST a URL to [project_url]/api/shorturl/new and I will receive a shortened URL in the JSON response. Example : {"original_url":"www.google.com","short_url":1}
User Story #2: If I pass an invalid URL that doesn't follow the http(s)://www.example.com(/more/routes) format, the JSON response will contain an error like {"error":"invalid URL"}
User Story #3: When I visit the shortened URL, it will redirect me to my original link.