HPE Instant On captive portal probe

Returning acknowledge string (variant 1):

InstantOn.Acknowledge

What the access point just sent

{
    "time": "2026-09-16T16:05:52+00:00",
    "remote_ip": "216.73.216.59",
    "method": "GET",
    "uri": "/?ack=1",
    "query": {
        "ack": "1"
    },
    "post": [],
    "raw_body": "",
    "user_agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)",
    "headers": {
        "Accept": "*/*",
        "User-Agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)",
        "Accept-Encoding": "gzip, br, zstd, deflate",
        "Host": "citygate.optinet.se"
    }
}