https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/customer-message/trans.html#消息转发到网页版客服工具

转发服务器返给微信服务器：

<xml><ToUserName><![CDATA[otkNu5FbmIpnTuwr7XKHfUOSSaS0]]></ToUserName><FromUserName><![CDATA[gh_0e2365540b70]></FromUserName><CreateTime>1640174666</CreateTime><MsgType><![CDATA[transfer_customer_service]]></MsgType></xml>

header也添加了text/xml，客服始终无法收到消息