code: @Override
      public Converter<?, RequestBody> requestBodyConverter(Type type,
                                                            Annotation[] parameterAnnotations,
                                                            Annotation[] methodAnnotations,
                                                            Retrofit retrofit) {
          JavaType javaType = mapper.getTypeFactory().constructType(type);
          ObjectWriter writer = mapper.writerFor(javaType).with(writerFilterProvider);
          return new JacksonRequestBodyConverter<>(writer);
      }
docs: {@inheritDoc}