setCertificate
This sets the certificate that @conn will present to its peer during the TLS handshake. For a #GTlsServerConnection, it is mandatory to set this, and that will normally be done at construct time.
For a #GTlsClientConnection, this is optional. If a handshake fails with %G_TLS_ERROR_CERTIFICATE_REQUIRED, that means that the server requires a certificate, and if you try connecting again, you should call this method first. You can call g_tls_client_connection_get_accepted_cas() on the failed connection to get a list of Certificate Authorities that the server will accept certificates from.
(It is also possible that a server will allow the connection with or without a certificate; in that case, if you don't provide a certificate, you can tell that the server requested one by the fact that g_tls_client_connection_get_accepted_cas() will return non-null.)
Since
2.28
Parameters
the certificate to use for @conn