code: public Status validateResponseContent(Object responseContent, String uri, String httpMethod, String statusCode) {
          return validateResponseContent(responseContent, uri, httpMethod, statusCode, JSON_MEDIA_TYPE);
      }
docs: validate a given response content object with media content type "application/json"
  uri, httpMethod, statusCode, DEFAULT_MEDIA_TYPE is to locate the schema to validate
  @param responseContent response content needs to be validated
  @param uri original uri of the request
  @param httpMethod eg. "put" or "get"
  @param statusCode eg. 200, 400
  @return Status