Express.js: how to get remote client address

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If you are running behind a proxy like NGiNX or what have you, only then you should check for 'x-forwarded-for':

var ip = req.headers['x-forwarded-for'] || req.socket.remoteAddress

If the proxy isn’t ‘yours’, I wouldn’t trust the 'x-forwarded-for' header, because it can be spoofed.

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