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Merge pull request #9178 from robertomiranda/best-standard-support-guide 

Update upgrading guide with ActionDispatch::BestStandardsSupport removal [ci skip]
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Carlos Antonio da Silva 2013-02-04 15:50:10 -08:00
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guides/source/upgrading_ruby_on_rails.md
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@ -82,6 +82,8 @@ becomes
get 'こんにちは', controller: 'welcome', action: 'index'
```
* Rails 4.0 has removed ActionDispatch::BestStandardsSupport middleware, !DOCTYPE html already triggers standards mode per http://msdn.microsoft.com/en-us/library/jj676915(v=vs.85).aspx and ChromeFrame header has been moved to `config.action_dispatch.default_headers`
### Active Support
Rails 4.0 removes the `j` alias for `ERB::Util#json_escape` since `j` is already used for `ActionView::Helpers::JavaScriptHelper#escape_javascript`.