Request Header Parser - Where do I pull data from?

I’m a bit confused about where to go with this challenge. I’m to return the user’s IP, language and OS. Ok, but I’m not at all sure where you go to get these details.

When a user makes a request on your server do these details get supplied to express? If so I imagine it’s just about finding them and reporting them back in an object. Is this it or am I way off in that assumption?

you will find answers here

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Thank you. I’ll have a look