code: func (c *Client) LogDrainCreate(appIdentity string, url string) (*LogDrain, error) {
  	params := struct {
  		URL string `json:"url"`
  	}{
  		URL: url,
  	}
  	var logDrainRes LogDrain
  	return &logDrainRes, c.Post(&logDrainRes, "/apps/"+appIdentity+"/log-drains", params)
  }
docs: // Create a new log drain.
  //
  // appIdentity is the unique identifier of the LogDrain's App. url is the url
  // associated with the log drain.