Add X-Requested-With: XMLHttpRequest to all requests #17
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We have annoying issues crop up periodically with DELETE requests (silently) requiring a CSRF token when other request types don't.
This stems from the following code, which shows its actually the body content-type being JSON that matters - and DELETES just happen to not typically have bodies.
https://github.com/NoRedInk/NoRedInk/blob/387f54e9db092e4188116bd8d2daa06460dd8bcc/monolith/app/controllers/application_controller.rb#L117
So instead this PR adds the X-Requested-With: XMLHttpRequest header to all requests.