下载文件接口http状态码非200时报错，The result returned by the server is illegal

[shin8085]

版本：2.3.0 比如输入一个错误的file_token时就会抛出上面的异常 调用方法：client.drive().v1().file().download()

// file.java 第417行
DownloadFileResp resp = UnmarshalRespUtil.unmarshalResp(httpResponse, DownloadFileResp.class);
if (resp == null) {
    throw new IllegalArgumentException("The result returned by the server is illegal");
}

此时resp为null，接着就会抛出异常