If you are copying the curl command, add a -L to the command. This API call will send back a 301 redirect. In order to follow that redirect -L is needed as an argument.
Will return a redirect link towards a csv file with all alerts that were active for any device in zone in the specified time interval. This endpoint is just an extension of account alerts csv endpoint, filtering the alerts for the devices in the specified zone, and so, same query strings are supported (please check it for details). Using the devices query string, is possible, but only the ones that are in the specified zone will be considered.