Why does my Alpha Vantage api Call dosent work?

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I have a question, I want to get some information about the Alpha Vantage API in my app:

https://www.alphavantage.co/query?function=OVERVIEW&symbol=IBM&apikey=demo

Now it is so that my code does not work I get no errors but in the result I don't get any outputs, so could someone tell me what the problem is and correct it if possible ?

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