a = Mechanize.new a.user_agent_alias = 'Windows IE 9' この user_agent_alias= は、中では Mechanize::AGENT_ALIASES と言う定数を参照してUAを決めているっぽい Mechanize::AGENT_ALIASES => {"Mechanize"=> "Mechanize/2.7.3 Ruby/2.0.0p353 (http://github.com/sparklemotion/mechanize/)", "Linux Firefox"=> "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.1) Gecko/20100122 firefox/3.6.1", "Linux Konqueror"=>"Mozilla/5.0 (compatible; Kon
![RubyのMechanizeでUAをいい感じにセット - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/e5bf20f7556af4c19c8f2b7541169a01d06bc755/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9UnVieSVFMyU4MSVBRU1lY2hhbml6ZSVFMyU4MSVBN1VBJUUzJTgyJTkyJUUzJTgxJTg0JUUzJTgxJTg0JUU2JTg0JTlGJUUzJTgxJTk4JUUzJTgxJUFCJUUzJTgyJUJCJUUzJTgzJTgzJUUzJTgzJTg4JnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmdHh0LWNsaXA9ZWxsaXBzaXMmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0yNWU3YjE0MzI2NTY0NTQ2MGQxNDI0OTAzYmY5ZDRmMA%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwdWR6dXJhJnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9MzYmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz0wOThjNjVkMGRjOGY3YjQ4ZjVjZmExMjI2Nzk1MGExZQ%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3De64d0254be6f6e8961f5d4c44e02805c)