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Rails 6.0 introduced a `hosts` option which, in the development environment, defaults to all IP addresses and the `localhost` domain. However, we can't work with subdomains using `localhost`. For that purpose, the `lvh.me` domain was created [1]. So we're allowing this domain and its subdomains so we can use them while working with multitenancy in the development environment. [1] http://railscasts.com/episodes/123-subdomains-revised