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問題
https://domain/page?1%2b(select*from(select(sleep(x)))a)%2b=1のように 'sleepy user agent' クエリが付加された URL を Liferay は制限しません。
Environment
Liferay DXP 7.4
解決策
Sleepy user agent payload は x 秒間ページをスリープモード（非アクティブ）にします。これは ではなく Liferay portal で観察された動作です。