title: Dropbox API: Get Notified On File Events Without Polling
body: <p>I found <a href="https://stackoverflow.com/questions/9633410/get-notified-when-a-file-changes-on-dropbox">this post on getting Notified when a file changes on dropbox</a>.  The problem is that the "/delta" API endpoint requires polling.  I want instead to subscribe to events about file changes.</p>
  
  <p>Ideally, I could subscribe to both "new file" and "file updated" events for a specific folder.  I could then give dropbox a URL pointing to my own app that would be called when those events occurred.  This is similar to how Twilio works.  You can provide a URL to be POSTed to whenever your phone number receives a text message, and then your app can respond to POSTs to that URL however it wants.  This seems like a much more elegant solution than polling -- is there any way to do it with the dropbox API?</p>