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Mention Content-Type for JSON params parsing. 

http://stackoverflow.com/questions/8501021/rails-json-request-is-not-parsed-correctly-into-post-parameters
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Gustavo Delfino 2013-06-09 08:39:09 -04:30
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guides/source/action_controller_overview.md
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@ -129,7 +129,7 @@ Note that the `params` hash is actually an instance of `ActiveSupport::HashWithI
### JSON parameters
If you're writing a web service application, you might find yourself more comfortable accepting parameters in JSON format. Rails will automatically convert your parameters into the `params` hash, which you can access as you would normally.
If you're writing a web service application, you might find yourself more comfortable accepting parameters in JSON format. If the "Content-Type" header of your request is set to "application/json", Rails will automatically convert your parameters into the `params` hash, which you can access as you would normally.
So for example, if you are sending this JSON content: