Node.js、Express框架獲取客戶端IP地址

Node.js

//傳入請求HttpRequest
function getClientIp(req) {
        return req.headers['x-forwarded-for'] ||
        req.connection.remoteAddress ||
        req.socket.remoteAddress ||
        req.connection.socket.remoteAddress;
}

Express

//express框架則簡單許多
req.ip

意外收穫

          發現這兩種方式獲取的ip地址都帶有首碼，不知為何，看了眼Express request.js源碼，沒找到不對的地方。所以用正則表達式處理了下

req.ip.match(/\d+\.\d+\.\d+\.\d+/)