mongoose/docs/c-api/mg_net.h/mg_set_ssl.md

title	decl_name	symbol_kind	signature
mg_set_ssl()	mg_set_ssl	func	const char *mg_set_ssl(struct mg_connection *nc, const char *cert, const char *ca_cert);

Note: This function is deprecated. Please, use SSL options in mg_connect_opt.

Enables SSL for a given connection. cert is a server certificate file name for a listening connection or a client certificate file name for an outgoing connection. The certificate files must be in PEM format. The server certificate file must contain a certificate, concatenated with a private key, optionally concatenated with DH parameters. ca_cert is a CA certificate or NULL if peer verification is not required. Return: NULL on success or error message on error.