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#!/usr/local/bin/ruby require 'uri' uri = URI.parse('http://hoge.com/test/1234.html') p uri.merge('/css/def.css').to_s # => "http://hoge.com/css/def.css" p uri.merge('../lib/script.js').to_s # => "http://hoge.com/lib/script.js" p uri.merge('./5678.html').to_s # => "http://hoge.com/test/5678.html"