code: protected Configuration[] getWebAppContextConfigurations(WebAppContext webAppContext,
  			ServletContextInitializer... initializers) {
  		List<Configuration> configurations = new ArrayList<>();
  		configurations.add(
  				getServletContextInitializerConfiguration(webAppContext, initializers));
  		configurations.addAll(getConfigurations());
  		configurations.add(getErrorPageConfiguration());
  		configurations.add(getMimeTypeConfiguration());
  		return configurations.toArray(new Configuration[0]);
  	}
docs: Return the Jetty {@link Configuration}s that should be applied to the server.
  @param webAppContext the Jetty {@link WebAppContext}
  @param initializers the {@link ServletContextInitializer}s to apply
  @return configurations to apply