https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=30%25OFF%E3%81%AE%E3%81%B3%E3%81%AE%E3%81%B3%E3%82%BD%E3%83%95%E3%82%A1%E3%82%AB%E3%83%90%E3%83%BC%28%E3%83%9C%E3%82%BF%E3%83%8B%E3%82%AB%E3%83%AB%E6%9F%84%29+%E2%96%A0%E3%82%AB%E3%83%A9%E3%83%BC%EF%BC%9AC%28%E5%B0%8F%E8%8A%B1%E6%9F%84%2F%E3%82%B0%E3%83%AC%E3%83%BC%29+%E2%96%A0%E3%82%B5%E3%82%A4%E3%82%BA%EF%BC%9A%E8%82%98%E3%81%82%E3%82%8AM%282%E4%BA%BA%E6%8E%9B%E3%81%91%E7%94%A8%29%2C%E8%82%98%E3%81%82%E3%82%8AL%283%E4%BA%BA%E6%8E%9B%E3%81%91%E7%94%A8%29%2C%E8%82%98%E3%81%82%E3%82%8ALL%283%E4%BA%BA%E6%8E%9B%E3%81%91%E3%83%AF%E3%82%A4%E3%83%89%E7%94%A8%29&format=json&formatVersion=2&hits=5&page=1&sort=standard

URL_rss=XMLを見てみる。

stdClass Object
(
    [GenreInformation] => Array
        (
        )

    [Items] => Array
        (
        )

    [TagInformation] => Array
        (
        )

    [carrier] => 0
    [count] => 0
    [first] => 0
    [hits] => 0
    [last] => 0
    [page] => 1
    [pageCount] => 0
)