[chef] capturing http response

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I'm trying to send a post request to an HTTP server and capture some parts of
the json response in a chef resourse to use in a follow up HTTP request.  I've
found http://docs.opscode.com/resource_http_request.html which seems great to
do the first post, but I'm having trouble finding documentation/explanation
about capturing the response body for the request.  Anyone have any pointers?

Thanks,
-ryan