Retrieve an http/s url and checks its application type is application/json and the response content decodes properly into JSON.  
Optionally verify content is found using data file.

--help      shows this message
--version   shows version information

USAGE: check_http_json.pl -U http://my.url.com -d sample.data

-U          URL to retrieve (http or https)
-d          absolute path to data file containing hash to find with JSON response (optional)
-t          Timeout in seconds to wait for the URL to load. If the page fails to load, will exit with UNKNOWN state (default 60)