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Mention new CSRF protection gotcha in upgrade guide

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@jeremy jeremy authored
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  1. +26 −1 guides/source/
27 guides/source/
@@ -27,6 +27,31 @@ Upgrading from Rails 4.0 to Rails 4.1
NOTE: This section is a work in progress.
+### CSRF protection from remote `<script>` tags
+Or, "whaaat my tests are failing!!!?"
+Cross-site request forgery (CSRF) protection now covers GET requests with
+JavaScript responses, too. That prevents a third-party site from referencing
+your JavaScript URL and attempting to run it to extract sensitive data.
+This means that your functional and integration tests that use
+get :index, format: :js
+will now trigger CSRF protection. Switch to
+xhr :get, :index, format: :js
+to explicitly test an XmlHttpRequest.
+If you really mean to load JavaScript from remote `<script>` tags, skip CSRF
+protection on that action.
### Spring
If you want to use Spring as your application preloader you need to:
@@ -68,7 +93,7 @@ secrets, you need to:
### Changes in JSON handling
-The are a few major changes related to JSON handling in Rails 4.1.
+There are a few major changes related to JSON handling in Rails 4.1.
#### MultiJSON removal
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