code: @Override
      public HttpFilterBuilder equal(final String parameterName, final String value) {
  
          return addFilter(new RequestFilter<HttpRequest>() {
  
              @Override
              public boolean matches(HttpRequest request) {
                  final List<String> parameters = getParameterListOrNull(request, parameterName);
                  return parameters != null && parameters.size() == 1 && parameters.contains(value);
              }
  
              @Override
              public String toString() {
                  return String.format("parameter.equal('%s', '%s')", parameterName, value);
              }
          });
      }
docs: {@inheritDoc}