Method: OpenSSL::SSL::SSLSocket#npn_protocol

Defined in:
ossl_ssl.c

#npn_protocol ⇒ String | nil

Returns the protocol string that was finally selected by the client during the handshake.

Returns:

  • (String | nil) 


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# File 'ossl_ssl.c', line 2477

static VALUE
ossl_ssl_npn_protocol(VALUE self)
{
    SSL *ssl;
    const unsigned char *out;
    unsigned int outlen;

    GetSSL(self, ssl);

    SSL_get0_next_proto_negotiated(ssl, &out, &outlen);
    if (!outlen)
	return Qnil;
    else
	return rb_str_new((const char *) out, outlen);
}