old_contents: from __future__ import print_function, unicode_literals
  
  from flask import request, render_template
  
  from weblab.core.wl import weblab_api
  
  @weblab_api.route_webclient('/visir.html')
  def visir():
      return render_template("webclient/visir.html")
  
new_contents: from __future__ import print_function, unicode_literals
  
  from werkzeug.utils import secure_filename
  from flask import request, render_template, current_app
  
  from weblab.core.wl import weblab_api
  
  @weblab_api.route_webclient('/visir.html')
  def visir():
      return render_template("webclient/visir.html")
  
  @weblab_api.route_webclient('/fonts/<path:path>')
  def fonts(path):
      blueprint = current_app.blueprints['core_webclient']
      return blueprint.send_static_file("gen/fonts/{}".format(secure_filename(path)))
  
subject: Add fonts