/*
 * call-seq:
 *   easy.response_code                               => fixnum
 *
 * Retrieve the last received HTTP or FTP code. This will be zero
 * if no server response code has been received. Note that a proxy's
 * CONNECT response should be read with +http_connect_code+
 * and not this method.
 */
static VALUE ruby_curl_easy_response_code_get(VALUE self) {