如下是通过put请求【https://www.zhihu.com/api/v3/...】获取到的base64文本格式验证码，将其【R0lGODdhlgA8AI开头的字符串】作为参数放入百度OCR通用文字识别始终报错“不是有效的文件”，显然是被加密了，因为我在这个解密网站也无法通过base64文本还原为验证码，到底被怎样加密了呢?
百度报错：{"log_id": 1386885044547802291, "error_code": 216201, "error_msg": "image format error"}
put请求【https://www.zhihu.com/api/v3/...】获取到的base64验证码:{"img\_base64":"R0lGODdhlgA8AIcAAP7+/gEBAefn5xUVFdjY2MfHxyYmJlZWVkZGRoaGhmdnZ7i4uKenp3d3dzg4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\\nNnX6FGpUqVOpVrV6FWtWrVuNBgQAOw==\\n"}
明显带着换行符呢（蓝框处）：
你把
\n都去掉再 Base64 解码：