第1引数の末尾に/があるのとないのでは結果が異なる。
URI.join("http://www.hoge.jp/fuga", "hege").to_s
# => "http://www.hoge.jp/hege"
URI.join("http://www.hoge.jp/fuga/", "hege").to_s
# => "http://www.hoge.jp/fuga/hege"
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