访客手机端发送的消息小程序后台可以接收，但小程序发送的消息手机端无法接收

以下为接口报错日志

https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token=Bearer 66_8Mh2mz3IaDzJOu_0XUJ7d_1GiKG_CIlyO4No1laQFEAobUle66GeBhX9HJSxiIaiVvxE6qXw0fjQoUpDpm9zBGLJxGwPfmKFApLFZ4J9wg4l4L6GUbnUbtFADPYHOUeAGAMTZ

{"appId":"wx39a246d0ccc75fa6","msgtype":"text","text":{"content":"您好"},"touser":"o9vQZ45snSyQRIBLgTAH8GPFgG28"}

java.lang.RuntimeException: java.io.IOException: Invalid Http response

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