isBaseUrlAllowed example

            $field = $fields->get($key);

            if ($field === null) {
                continue;
            }

            /** @var ApiAware|null $flag */
            $flag = $field->getFlag(ApiAware::class);

            if ($flag === null || !$flag->isBaseUrlAllowed($baseUrl)) {
                unset($decoded[$key]);

                continue;
            }

            if ($value === null) {
                continue;
            }

            if ($field instanceof ManyToOneAssociationField || $field instanceof OneToOneAssociationField) {
                $value = $this->removeNotAllowedFields($value, $field->getReferenceDefinition(), $baseUrl);
            }

if ($propertyName === 'id') {
                continue;
            }

            if (!$fields->isAllowed($definition->getEntityName(), $propertyName)) {
                continue;
            }

            /** @var ApiAware|null $flag */
            $flag = $field->getFlag(ApiAware::class);

            if ($flag === null || !$flag->isBaseUrlAllowed($result->getBaseUrl())) {
                continue;
            }

            if ($field instanceof AssociationField) {
                $isSingle = $field instanceof ManyToOneAssociationField || $field instanceof OneToOneAssociationField;

                $reference = $field->getReferenceDefinition();
                if ($field instanceof ManyToManyAssociationField) {
                    $reference = $field->getToManyReferenceDefinition();
                }