Main.rb

# Here your code !
require 'net/http'
require 'uri'
require 'pp'
require 'json'

url = URI.parse(URI.escape('https://app.rakuten.co.jp/services/api/IchibaItem/Search/20140222?applicationId=1044477890616064296&keyword=アルゴリズム'))
res = Net::HTTP.start(url.host, url.port, use_ssl: true){|http|
    http.get(url.path + "?" + url.query);
}
obj = JSON.parse(res.body)
# puts obj
puts "<table border=1>"
obj['Items'].each{|itemObj|
    item = itemObj['Item']
    if ! item['mediumImageUrls'][0]
        next
    end
    puts <<_EOT_;
<tr>
    <td>
        <img src="#{item['mediumImageUrls'][0]['imageUrl']}"/>
    </td>
    <td>
        #{item['itemName']}
    </td>
</tr>
_EOT_
}
puts "</table>"