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Once you have your HTTP Request setup, you should also be able to use the same predefined variables to setup a Custom Email. Then you can build a policy which triggers off whatever Health Rule you setup and as the action trigger it to do both your HTTP Request and a custom email.
You might be able to do it a better way, but off the top of my head, this way seems simple enough.
It should be the same way you did your HTTP Requests, but this document may help: