old_contents: from django.core.serializers import serialize
  from django.http import HttpResponse
  from django.utils import simplejson
  from django.utils.functional import Promise
  from django.utils.encoding import force_unicode 
  
  class LazyEncoder(simplejson.JSONEncoder):
      def default(self, obj):
          if isinstance(obj, Promise):
              return force_unicode(obj)
          return obj
  
  class JSONResponse(HttpResponse):
      """
      A simple subclass of ``HttpResponse`` which makes serializing to JSON easy.
      """
      def __init__(self, object, is_iterable = True):
          if is_iterable:
              content = serialize('json', object)
          else:
              content = simplejson.dumps(object, cls=LazyEncoder)
          super(JSONResponse, self).__init__(content, mimetype='application/json')
  
  class XMLResponse(HttpResponse):
      """
      A simple subclass of ``HttpResponse`` which makes serializing to XML easy.
      """
      def __init__(self, object, is_iterable = True):
          if is_iterable:
              content = serialize('xml', object)
          else:
              content = object
          super(XMLResponse, self).__init__(content, mimetype='application/xml')
new_contents: from django.core.serializers import serialize
  from django.http import HttpResponse
  import json
  from django.utils.functional import Promise
  from django.utils.encoding import force_unicode
  
  class LazyEncoder(json.JSONEncoder):
      def default(self, obj):
          if isinstance(obj, Promise):
              return force_unicode(obj)
          return obj
  
  class JSONResponse(HttpResponse):
      """
      A simple subclass of ``HttpResponse`` which makes serializing to JSON easy.
      """
      def __init__(self, object, is_iterable = True):
          if is_iterable:
              content = serialize('json', object)
          else:
              content = simplejson.dumps(object, cls=LazyEncoder)
          super(JSONResponse, self).__init__(content, mimetype='application/json')
  
  class XMLResponse(HttpResponse):
      """
      A simple subclass of ``HttpResponse`` which makes serializing to XML easy.
      """
      def __init__(self, object, is_iterable = True):
          if is_iterable:
              content = serialize('xml', object)
          else:
              content = object
          super(XMLResponse, self).__init__(content, mimetype='application/xml')
  
subject: fix simplejson deprecation