def METHOD_NAME(self, content_type, data_hash, file_name):
    content_type = self.normalize(content_type)
    file_name = self.normalize(file_name)
    key = content_type + '/' + data_hash + '/' + file_name
    result = {key: memcache.METHOD_NAME(key)}
    content_type = urllib.unquote(content_type)
    if IMAGE_TYPES.match(content_type):
        thumbnail_key = key + THUMB_SUFFIX
        result[thumbnail_key] = memcache.METHOD_NAME(thumbnail_key)
    if 'application/json' in self.request.headers.get('Accept'):
        self.response.headers['Content-Type'] = 'application/json'
    s = self.json_stringify(result)
    self.response.write(s)