I was reading thru the security guide and working on some basic ajax... I 
thought it might be worth a mention in the guide that we don't need to set 
the X-CSRF-Token header when we create an ajax call. It is mentioned, but 
not very clear. I had to dig into 
rails<https://github.com/rails/rails/blob/28abd967fcc8544650c73910a8a0cbaa6dafc1f5/actionview/lib/action_view/helpers/csrf_helper.rb>to
 find what actually happens.

I have created a branch with the following text, added after line 242 in 
guides/source/security.md

If you are using 'jquery-rails' then your ajax calls will automatically 
> include a 'X-CSRF-Token' HTTP header. The value of this header will match 
> the 'csrf-token' meta tag in your document head. Rails will reject any 
> incoming ajax call, if the token is missing or incorrect. Malicious ajax 
> which executes in the context of a different document will not have access 
> to the csrf-token meta tag.


If this seems like a good addition, I am happy to submit it as a pull 
request to rails.git

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