title: How to get client IP of requests via CloudFront?
body: <p>According to the doc of CloudFront
  (<a href="https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/RequestAndResponseBehaviorCustomOrigin.html" rel="noreferrer">https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/RequestAndResponseBehaviorCustomOrigin.html</a>), client IP can be the front, middle, end of <code>X-Forwarded-For</code> header.</p>
  
  <p>Is it rignt? Then how can I get real client IP?</p>