express - How to get req.hostname when running node.js behind apache with mod_proxy -

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my node.js application uses req.hostname in order redirect pages http https this:

app.get('*', function(req, res){     res.redirect('https://' + req.hostname + req.url); });

this works when running application on localhost. when application runs on server behind mod_proxy req.hostname not contain domain name. instead contains localhost. how domain name?

on apache settings have add this:

proxypreservehost on

this tell apache preserve hostname when doing proxy pass node application


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