old_contents: import json
  import os
  
  from django.conf import settings
  from django.http import HttpResponse
  from django.views.decorators.cache import cache_page
  
  from .wordcloud import popular_words
  
  
  @cache_page(60*60*4)
  def wordcloud(request, max_entries=30):
      """ Return tag cloud JSON results"""
  
      max_entries = int(max_entries)
      leaf_name = 'wordcloud-{0}.json'.format(max_entries)
      cache_path = os.path.join(
          settings.MEDIA_ROOT, 'wordcloud_cache', leaf_name
      )
      if os.path.exists(cache_path):
          response = HttpResponse()
          response['Content-Type'] = 'application/json'
          response['X-Sendfile'] = cache_path.encode('utf-8')
          return response
  
      content = json.dumps(popular_words(max_entries=max_entries))
  
      return HttpResponse(
          content,
          content_type='application/json',
      )
  
new_contents: import json
  import os
  
  from django.conf import settings
  from django.http import HttpResponse
  from django.views.decorators.cache import cache_page
  
  from .wordcloud import popular_words
  
  
  @cache_page(60*60*4)
  def wordcloud(request, max_entries=30):
      """ Return tag cloud JSON results"""
  
      max_entries = int(max_entries)
      leaf_name = 'wordcloud-{0}.json'.format(max_entries)
      cache_path = os.path.join(
          settings.MEDIA_ROOT, 'wordcloud_cache', leaf_name
      )
      if os.path.exists(cache_path):
          response = HttpResponse(json.dumps({
              'error':
              ("If you can see this, then X-SendFile isn't configured "
               "correctly in your webserver. (If you're using Nginx, you'll "
               "have to change the code to add a X-Accel-Redirect header - "
               "this hasn't currently been tested.)")
          }))
          response['Content-Type'] = 'application/json'
          response['X-Sendfile'] = cache_path.encode('utf-8')
          return response
  
      content = json.dumps(popular_words(max_entries=max_entries))
  
      return HttpResponse(
          content,
          content_type='application/json',
      )
  
subject: Add diagnostic output for when X-SendFile is misconfigured