code: def upload_progress(request):
      
      if 'X-Progress-ID' in request.GET:
          progress_id = request.GET['X-Progress-ID']
      elif 'X-Progress-ID' in request.META:
          progress_id = request.META['X-Progress-ID']
      if progress_id:
          cache_key = "%s_%s" % (request.META['REMOTE_ADDR'], progress_id)
          data = cache.get(cache_key)
          return HttpResponse(simplejson.dumps(data))
docs: Used by Ajax calls
  
      Return the upload progress and total length values