code: @Override
      public HttpFilterBuilder containsParameter(final String parameterName) {
  
          return addFilter(new RequestFilter<HttpRequest>() {
  
              @Override
              public boolean matches(HttpRequest request) {
                  final List<String> parameters = getParameterListOrNull(request, parameterName);
                  return parameters != null;
              }
  
              @Override
              public String toString() {
                  return String.format("containsParameter('%s')", parameterName);
              }
          });
      }
docs: {@inheritDoc}