If it's a https URL: Yes, the TLS handshake. There are curl builds[1] which try (and succeed) to imitate the TLS handshake (and settings for HTTP/2) of a normal browser, though.
[1] https://github.com/lwthiker/curl-impersonate
If it's a https URL: Yes, the TLS handshake. There are curl builds[1] which try (and succeed) to imitate the TLS handshake (and settings for HTTP/2) of a normal browser, though.
[1] https://github.com/lwthiker/curl-impersonate