I have followed with all details the step by step process in this lesson, however when I tried to bring the historical_url request, it said 401 error. I don't know if the format have been updated or what's going on but I have been not able to get the historical_url request. Please help!

Hi, Unfortunately, at some point, the API owners decided to change its structure. That's why the code for this section is broken. Right now, the API has a free plan that has basic functionality, however, even the free plan requires registration. Best, 365 Team, Nikola

I think the following code should work: url = f"https://api.apilayer.com/exchangerates_data/timeseries?start_date=2017-04-26&end_date=2018-04-26&symbols=GBP&base=USD&apikey={YOUR_API_KEY}" The KEY is free to get from https://apilayer.com/