code: @SafeVarargs
  	public final RestBuilder errorHandler(Class<? extends ExceptionHandler>... handlers) {
  
  		Assert.notNullOrEmpty(handlers, "Missing exception handler(s)!");
  
  		exceptionHandlers.addAll(Arrays.asList(handlers));
  		return this;
  	}
docs: Registeres one or more exception handler classes
  
  @param handlers to be registered
  @return builder