apollo-common/src/main/java/com/ctrip/framework/apollo/common/controller/HttpMessageConverterConfiguration.java/HttpMessageConverterConfiguration/messageConverters
class HttpMessageConverterConfiguration:  @Bean
  public HttpMessageConverters messageConverters() {
    GsonHttpMessageConverter gsonHttpMessageConverter = new GsonHttpMessageConverter();
    gsonHttpMessageConverter.setGson(
            new GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZ").create());
    final List<HttpMessageConverter<?>> converters = Lists.newArrayList(
            new ByteArrayHttpMessageConverter(), new StringHttpMessageConverter(),
            new AllEncompassingFormHttpMessageConverter(), gsonHttpMessageConverter);
    return new HttpMessageConverters() {
      @Override
      public List<HttpMessageConverter<?>> getConverters() {
        return converters;
      }
    };
  }