Node.js get remote ip address

remote_ip

  return request.headers['x-forwarded-for']
    ? request.headers['x-forwarded-for']
    : (request.connection && request.connection.remoteAddress)
    ? request.connection.remoteAddress
    : (request.connection.socket && request.connection.socket.remoteAddress)
    ? request.connection.socket.remoteAddress
    : (request.socket && request.socket.remoteAddress)
    ? request.socket.remoteAddress
    : '0.0.0.0';