@deftypefun {int} {gnutls_url_is_supported} (const char * @var{url})
@var{url}: A PKCS 11 url

Check whether url is supported.  Depending on the system libraries
GnuTLS may support pkcs11 or tpmkey URLs.

@strong{Returns:} return non-zero if the given URL is supported, and zero if
it is not known.

@strong{Since:} 3.1.0
@end deftypefun