https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=%E7%A4%BE%E4%BC%9A%E7%9A%84%E9%A4%8A%E8%AD%B7%E3%81%AE%E5%AD%90%E3%81%A9%E3%82%82%E9%81%94%E3%82%92%E6%95%91%E3%81%84%E3%81%9F%E3%81%84&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
)