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fix: describe module autoloading in config.ru #1976

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Oct 21, 2022
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fix: describe module autoloading in config.ru #1976

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fef7827
fix: describe module autoloading in config.ru
yumetodo Oct 20, 2022
24d68cd
fix: move module autoloading section into rackup section (#1975)
yumetodo Oct 21, 2022
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17 changes: 17 additions & 0 deletions UPGRADE-GUIDE.md
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Expand Up @@ -116,6 +116,23 @@ gem 'rackup'

This provides all the previously available functionality.


#### `config.ru` autoloading is disabled unless `require 'rack'`

Previously, rack modules like `rack/directory` were autoloaded because `rackup` did require 'rack'. In Rack 3, you will need to write `require 'rack'` or require specific module explicitly.

```diff
+require 'rack'
run Rack::Directory.new '.'
```

or

```diff
+require 'rack/directory'
run Rack::Directory.new '.'
```

## Request Changes

### `rack.version` is no longer required
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