Im using ES 2.4.1, kibana 4.6.1 on Mac, everything is installed locally for development purpose. then I copied and pasted a Generation URL to browser. It gave me {"statusCode":404,"error":"Not Found"}. However, if I clicked the Printable PDF button, it could trigger a report processing under Settings -> Reporting --> Generated Reports, and could download afterward.
That URL isn't meant to be used with GET. You'll need to use POST, and you'll need to include a kbn-xsrf header. If you're using Shield, also include Basic auth information. You can see this if you look at the Watcher formula in the Getting Started guide.
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