<p>This is pretty much working as documented: <a href="https://guides.rubyonrails.org/kindle/command_line.html#rails-server" rel="nofollow">https://guides.rubyonrails.org/kindle/command_line.html#rails-server</a></p>
<p>I also have no idea why they put tcp in there, even the port supports http on the application level.</p>

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