code: def on_show(request, page_name):
      
      revision_id = request.args.get("rev", type=int)
      query = RevisionedPage.query.filter_by(name=page_name)
      if revision_id:
          query = query.filter_by(revision_id=revision_id)
          revision_requested = True
      else:
          query = query.order_by(RevisionedPage.revision_id.desc())
          revision_requested = False
      page = query.first()
      if page is None:
          return page_missing(request, page_name, revision_requested)
      return Response(generate_template("action_show.html", page=page))
docs: Displays the page the user requests.