javascript - How do I get the domain originating the request in express.js? -

i'm using express.js , need know domain originating call. simple code

app.get(     '/verify_license_key.json',     function( req, res ) {         // 

how domain req or res object? mean need know if api called somesite.com or someothersite.com. tried doing console.dir of both req , res got no idea there, read documentation gave me no help.

you have retrieve host header.

var host = req.get('host'); 

it optional http 1.0, required 1.1. and, app can impose requirement of own.

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if supporting cross-origin requests, instead use origin header.

var origin = req.get('origin'); 

note cross-origin requests require validation through "preflight" request:

req.options('/route', function (req, res) {     var origin = req.get('origin');     // ... }); 

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if you're looking client's ip, can retrieve with:

var userip = req.socket.remoteaddress; 

• message.socket.
• socket.remoteaddress

note that, if server behind proxy, give proxy's ip. whether can user's ip depends on info proxy passes along. but, it'll typically in headers well.