code: func (r *RedisStorer) Get(key string) (value string, err error) {
  	val, err := r.client.Get(key).Result()
  	if err == redis.Nil {
  		return "", errNoSession{}
  	} else if err != nil {
  		return "", errors.Wrap(err, "unable to get session")
  	}
  
  	return val, nil
  }
docs: // Get returns the value string saved in the session pointed to by the
  // session id key.