Example function that can be used to detect Do Not Track preferences server side

dnt-server-side-function.js

function isDoNotTrackEnabled (request) {
  const doNotTrackHeader = request.header('DNT')
  
  if (!doNotTrackHeader) {
    return false
  }

  if (doNotTrackHeader.charAt(0) === '1') {
    return true
  }

  return false
}