code: public RestTemplateBuilder customizers(
  			RestTemplateCustomizer... restTemplateCustomizers) {
  		Assert.notNull(restTemplateCustomizers,
  				"RestTemplateCustomizers must not be null");
  		return customizers(Arrays.asList(restTemplateCustomizers));
  	}
docs: Set the {@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. Setting this value will
  replace any previously configured customizers.
  @param restTemplateCustomizers the customizers to set
  @return a new builder instance
  @see #additionalCustomizers(RestTemplateCustomizer...)