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Add URL rewriting in Rails #435

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Add URL rewriting in Rails
hunchr Jan 14, 2026
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hunchr Jan 15, 2026
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Expand Up @@ -37,6 +37,22 @@ When preparing your app for production on Deploio, ensure the following:

For detailed instructions and best practices, including quick start guides for a variety of frameworks, please refer to the [Deploio deployment documentation](https://guides.deplo.io/user-guide/network-and-deployment.html#network-deployment).

### URL rewriting in Rails

Ensure that all custom hostnames are configured on Deploio. For example, if the app host
is `example.com`, configure `example.com`, `www.example.com`, and `example-main.renuoapp.ch`.

Then, redirect everything to the main hostname by adding the following to your `config/routes.rb` file:

```rb
Rails.application.routes.draw do
if (app_host = ENV["APP_HOST"]).present?
match "*path", constraints: ->(req) { req.host != app_host && !req.path.start_with?("/.well-known/") },
to: redirect { |_params, req| "https://#{app_host}#{req.fullpath}" }, via: :all
end
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@sislr sislr Jan 15, 2026

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Suggested change
if (app_host = ENV["APP_HOST"]).present?
match "*path", constraints: ->(req) { req.host != app_host && !req.path.start_with?("/.well-known/") },
to: redirect { |_params, req| "https://#{app_host}#{req.fullpath}" }, via: :all
end
if (canonical_host = ENV["CANONICAL_HOST"]).present?
match "*path", constraints: ->(req) { req.host != canonical_host && !req.path.start_with?("/.well-known/") },
to: redirect { |_params, req| "https://#{canonical_host}#{req.fullpath}" }, via: :all
end

I'd rather use a separate ENV variable here. APP_HOST is in most cases also set in staging apps AFAIK

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@hunchr hunchr Jan 15, 2026

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Isn't that what we want? If the env is set in staging/develop, then the deplo.io host redirects to renuoapp.

end
```

## Heroku

* Check the size and amount of dynos on Heroku
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