code: func ServerEndpoint(host string) oauth2.Endpoint {
  	return oauth2.Endpoint{
  		AuthURL:  "https://" + host + "/users/authorize",
  		TokenURL: "https://" + host + "/v2/oauth/token",
  	}
  }
docs: // ServerEndpoint returns a new oauth2.Endpoint for a HipChat Server instance
  // running on the given domain or host.