"application/rss+xml", 'content' => << ]> http://example.com/ &xxe; urn:uuid:43fb1908-42ec-11e7-b61b-2b118faca2f2 http://example.com/1 urn:uuid:4c8dbc84-42eb-11e7-9f61-6f83db96854f urn:uuid:43fb1908-42ec-11e7-b61b-2b118faca2f2 http://example.com/1 urn:uuid:43fb1908-42ec-11e7-b61b-2b118faca2f2 http://example.com/2 Example content MESSAGE_BODY ];