code: public RestTemplateBuilder additionalCustomizers(
  			RestTemplateCustomizer... restTemplateCustomizers) {
  		Assert.notNull(restTemplateCustomizers,
  				"RestTemplateCustomizers must not be null");
  		return additionalCustomizers(Arrays.asList(restTemplateCustomizers));
  	}
docs: Add {@link RestTemplateCustomizer RestTemplateCustomizers} that should be applied
  to the {@link RestTemplate}. Customizers are applied in the order that they were
  added after builder configuration has been applied.
  @param restTemplateCustomizers the customizers to add
  @return a new builder instance
  @see #customizers(RestTemplateCustomizer...)