With curl on the apache server :
curl -i https://domaine-name/standalone-signaling/api/v1/welcome
HTTP/1.1 200 OK
Date: Sun, 15 Nov 2020 19:55:27 GMT
Server: nextcloud-spreed-signaling/9206a56113064b8e44b0de12d5128f8e88617679
Strict-Transport-Security: max-age=63072000; includeSubdomains; preload
X-Frame-Options: DENY
X-Content-Type-Options: nosniff
Content-Type: application/json; charset=utf-8
Content-Length: 94
Via: 1.1 domaine-name
{ânextcloud-spreed-signalingâ:âWelcomeâ,âversionâ:â9206a56113064b8e44b0de12d5128f8e88617679â}
Thanks