code: func (c *Client) RawRequest(method string, params []json.RawMessage) (json.RawMessage, error) {
  	return c.RawRequestAsync(method, params).Receive()
  }
docs: // RawRequest allows the caller to send a raw or custom request to the server.
  // This method may be used to send and receive requests and responses for
  // requests that are not handled by this client package, or to proxy partially
  // unmarshaled requests to another JSON-RPC server if a request cannot be
  // handled directly.