code: func (c *Client) Init(root, auth string, api Api) {
  	if api == nil {
  		api = new(f)
  	}
  
  	c.api = api
  	c.Url = root
  	c.Auth = auth
  }
docs: // Init initializes the Firebase client with a given root url and optional auth token.
  // The initialization can also pass a mock api for testing purposes.