title: req.headers.origin is undefined
body: <p>Fairly new to Node and Express. I have a sails.js app that relies on knowing the origin of a request as I need to authenticate the request is coming from a domain that is registered. </p>
  
  <p>I've seen in the logs that the origin is empty occasionally, why would this be happening? Is it not a good idea to rely on the origin property, is there another option?</p>
  
  <p>Thanks</p>