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Allow blocks to be configured to show/hide on 200/403/404 response pages [#2245767]

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How to Customize Error Pages (Symfony 2.7 Docs)

How to Customize Error Pages (Symfony 3.3 Docs)

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Symfony Tutorial: Internationalization and Localization

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Jidox - Symfony Material Design Template, Web Templates - Envato Elements

A better error page for Symfony applications - Freek Van der Herten's blog on PHP, Laravel and JavaScript

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