https://app.rakuten.co.jp/services/api/IchibaItem/Search/20220601?applicationId=b81babe0dea9170ecdaf3c019d8709b6&affiliateId=0433111a.0d75cb85.0433111b.a7f1907e&keyword=%E3%80%903%E7%82%B9%E4%BB%A5%E4%B8%8A%E3%81%AE%E3%81%BE%E3%81%A8%E3%82%81%E8%B2%B7%E3%81%84%E3%81%A7%E3%81%8A%E5%BE%97%EF%BC%81%E3%80%91%E3%80%90%E3%82%A2%E3%82%A6%E3%83%88%E3%83%AC%E3%83%83%E3%83%88%E3%80%91%E4%B8%A1%E3%83%91%E3%83%83%E3%82%AF%E3%81%8A%E6%98%BC%E5%AF%9D%E6%95%B7%E3%81%8D%E3%81%B5%E3%81%A8%E3%82%93%E5%B0%82%E7%94%A8%E3%82%B7%E3%83%BC%E3%83%84+%E2%80%BB%E5%9C%A8%E5%BA%AB%E9%99%90%E3%82%8A%E3%81%AB%E3%81%A4%E3%81%8D%E7%89%B9%E5%88%A5%E4%BE%A1%E6%A0%BC&format=json&formatVersion=2&hits=10&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
)