Like others here I'm not sure if this is a joke post or not, but... the TerminalAdapter example is not an abstraction. It's simply reimplementing a very specific protocol that implements "render" and "redirect_to". This protocol is not something that could automatically be adapted to other scenarios than HTTP — say, to a mobile app or to a desktop GUI app. The terminal, for one, might "render", but it cannot "redirect".
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Like others here I'm not sure if this is a joke post or not, but... the TerminalAdapter example is not an abstraction. It's simply reimplementing a very specific protocol that implements "render" and "redirect_to". This protocol is not something that could automatically be adapted to other scenarios than HTTP — say, to a mobile app or to a desktop GUI app. The terminal, for one, might "render", but it cannot "redirect".