code: public AuthorizationCodeUriRequest.Builder authorizationCodeUri(String client_id, URI redirect_uri) {
      return new AuthorizationCodeUriRequest.Builder()
              .setDefaults(httpManager, scheme, host, port)
              .client_id(client_id)
              .response_type("code")
              .redirect_uri(redirect_uri);
    }
docs: Retrieve an URL where the user can give the application permissions.
  
  @param client_id    When you register your application, Spotify provides you a Client ID.
  @param redirect_uri This parameter is used for validation only (there is no actual redirection). The
  value of this parameter must exactly match the value of redirect_uri supplied when requesting
  the authorization code.
  @return An {@link AuthorizationCodeUriRequest.Builder}.