title: Google Drive API V3: get the content of a revision
body: <p>The Google Drive API change from V2 to V3, remove the revision.items from response. The items, had a list of urls, being the files in .txt, .pdf, etc. (I'm using straight HTTP protocol, no wrappers).
  In V3 there seems to be no way to do this. There is however an ?alt=media parameter, which is supposed to return a file, but I get a 403 error trying it. </p>
  
  <p>Any clues?</p>
  
  <p><a href="https://developers.google.com/drive/v3/reference/revisions/get" rel="nofollow noreferrer">https://developers.google.com/drive/v3/reference/revisions/get</a></p>