$ sbx exec m101-policy sh -c 'curl -sS --max-time 10 -I https://example.com; echo exit=$?'
HTTP/1.0 200 Connection established

HTTP/2 200 
date: <value>
content-type: text/html; charset=utf-8
server: cloudflare
last-modified: <value>
allow: GET, HEAD
accept-ranges: bytes
age: <value>
cf-cache-status: <value>
cf-ray: <value>
alt-svc: <value>

exit=0
[exit 0]