old_contents: """
  Middleware for injecting the live-reload script.
  """
  from bs4 import BeautifulSoup
  
  from django.conf import settings
  from django.utils.encoding import smart_str
  
  try:
      import html5lib  # noqa
      html5lib_is_installed = True
  except ImportError:
      html5lib_is_installed = False
  
  
  IS_HTML5 = getattr(settings, 'LIVERELOAD_HTML5', html5lib_is_installed)
  
  PARSER = 'html.parser'
  if IS_HTML5:
      PARSER = 'html5lib'
  
  
  class LiveReloadScript(object):
      """
      Inject the live-reload script into your webpages.
      """
  
      def process_response(self, request, response):
          if response.status_code != 200:
              return response
  
          content_type = response.get(
              'Content-Type', '').split(';')[0].strip().lower()
          if content_type not in ['text/html', 'application/xhtml+xml']:
              return response
  
          soup = BeautifulSoup(
              smart_str(response.content), PARSER)
  
          if not getattr(soup, 'head', None):
              return response
  
          script = soup.new_tag(
              'script', src='http://localhost:35729/livereload.js')
          soup.head.append(script)
  
          response.content = str(soup)
  
          return response
  
new_contents: """
  Middleware for injecting the live-reload script.
  """
  from bs4 import BeautifulSoup
  
  from django.conf import settings
  from django.utils.encoding import smart_str
  from django.utils.deprecation import MiddlewareMixin
  
  try:
      import html5lib  # noqa
      html5lib_is_installed = True
  except ImportError:
      html5lib_is_installed = False
  
  
  IS_HTML5 = getattr(settings, 'LIVERELOAD_HTML5', html5lib_is_installed)
  
  PARSER = 'html.parser'
  if IS_HTML5:
      PARSER = 'html5lib'
  
  
  class LiveReloadScript(MiddlewareMixin):
      """
      Inject the live-reload script into your webpages.
      """
  
      def process_response(self, request, response):
          if response.status_code != 200:
              return response
  
          content_type = response.get(
              'Content-Type', '').split(';')[0].strip().lower()
          if content_type not in ['text/html', 'application/xhtml+xml']:
              return response
  
          soup = BeautifulSoup(
              smart_str(response.content), PARSER)
  
          if not getattr(soup, 'head', None):
              return response
  
          script = soup.new_tag(
              'script', src='http://localhost:35729/livereload.js')
          soup.head.append(script)
  
          response.content = str(soup)
  
          return response
  
subject: Fix middleware for Django 1.10