new_contents: from django.http import HttpResponseNotAllowed
  
  def post_only(func):
      def decorated(request, *args, **kwargs):
          if request.method != 'POST':
              return HttpResponseNotAllowed(['GET'])
          return func(request, *args, **kwargs)
      return decorated
  
  def get_only(func):
      def decorated(request, *args, **kwargs):
          if request.method != 'GET':
              return HttpResponseNotAllowed(['POST'])
          return func(request, *args, **kwargs)
      return decorated
  
subject: Add post_only and get_only decorators