https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=%E3%80%90%E3%83%99%E3%83%AB%E3%83%A1%E3%82%BE%E3%83%B3%E3%80%91%E3%81%8F%E3%82%8B%E3%81%A3%E3%81%A8%E3%83%94%E3%82%BF%E3%83%83%E3%81%A8%E6%8C%87%E3%82%B5%E3%83%9D%E3%83%BC%E3%82%BF%E3%83%BC+2%E6%9E%9A%E5%85%A5&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
)