Using Curl to access web pages
Links: Security/Web , Linux/OpenSSL
Check Headers e.g. CORS (access-control-allow-origin:) headers
$ curl -k -sD - -H "Origin: https://wiki.vigor.nz" -o /dev/null https://wiki.vigor.nz/
or
curl -H "Origin: https://mydomain.nz" -H "Access-Control-Request-Method: GET" -H "Access-Control-Request-Headers: X-Requested-With" -X OPTIONS --verbose https://vigor.nz 2>&1 | grep -i "access\|cors"