code: public static void mapper(final HttpConfig config, final ObjectMapper mapper, final Iterable<String> contentTypes) {
          config.context(contentTypes, OBJECT_MAPPER_ID, mapper);
      }
docs: Used to configure the provided Jackson `ObjectMapper` in the configuration context for the specified content type.
  
  [source,groovy]
  ----
  def http = HttpBuilder.configure {
  request.uri = "${serverRule.serverUrl}/jackson"
  request.contentType = OTHER_TYPE
  Jackson.mapper(delegate, objectMapper, [OTHER_TYPE])
  }
  ----
  
  @param config the configuration
  @param mapper the `ObjectMapper` to be used.
  @param contentTypes the content types to be configured with the mapper