Zabbix_item_http check web server status by Headers

Hi,
I’m trying to configure http item to check my web server status is 200.
I’m using this terraform script to create item:

resource "zabbix_item_http" "check_200_item" {
  hostid    = data.zabbix_template.template.id
  key       = "check_200"
  name      = "check_200"
  valuetype = "text"
  delay     = "1m"
  history   = "90d"
  url             = "http://mysite.mydomain.com"
  request_method  = "post"
  status_codes    = "200"
}

How can set by terraform “Retrieve Mode = Headers”?

image

I tried to add retrieve_mode = "1" but it doesn’t work and I receive

Error: Unsupported argument