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the server should give back the string "Hello World"
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add the endpoint "./now" when the url "http://localhost:4000/now" is called, the current Date and Time should be displayed
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add the endpoint "./count" when the url "http://localhost:4000/count" is called, a number should be displayed, the number displayed should count up for every call
create a .env Datei, which holds the port-number you are listening to