urlヘルパーでホストを指定
app.root_url(host: 'http://www.customdomain.org', protocol: 'https') => "https://www.customdomain.org/" Set the Domain or Host in Rails URL Helpers - Today I Learned
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app.root_url(host: 'http://www.customdomain.org', protocol: 'https') => "https://www.customdomain.org/" Set the Domain or Host in Rails URL Helpers - Today I Learned