https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=%E5%91%BD%E3%82%92%E7%B9%8B%E3%81%8E%E3%80%81%E5%85%B1%E3%81%AB%E7%94%9F%E3%81%8D%E3%82%8B%E3%80%82%E5%B8%8C%E5%B0%91%E7%8C%9B%E7%A6%BD%E9%A1%9E%E3%81%AB%E3%82%88%E3%82%8A%E8%89%AF%E3%81%84%E6%95%91%E5%91%BD%E5%8C%BB%E7%99%82%E3%81%A8%E5%85%B1%E7%94%9F%E7%92%B0%E5%A2%83%E3%82%92%EF%BC%81&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
)