Verify ip adress in middleware

for this challenge:

whose IP gets printed and how can I see that?

In a real (non-glitch) nodejs app that you deploy to a server, the ip property attached to the req object should be that of the client’s making the request to the server. However glitch sets the X-Forwarded-For header for incoming requests and req.ip only gives ::ffff: or some local rendition of that, to get your true ip address in glitch use req.headers['x-forwarded-for']) and find it in there.

edit: Note also, the trust proxy setting must also be enabled for req.ip to work

When the trust proxy setting does not evaluate to false , the value of this property is derived from the left-most entry in the X-Forwarded-For header. This header can be set by the client or by the proxy.
You can get the status of ‘trust proxy’ with app.disabled('trust proxy'), in other words if you do a app.enable('trust proxy') at the top, req.ip will also give you your true ip address even in glitch.