支付宝预授权流程中，显示订单参数异常，请重新下单后在发起（ALIN42682）

在进行支付宝预授权开发时，第一步按照样例服务器调用sdk请求阿里网关已成功，并获得orderStr。

orderStr 内容：

app_id=2019101668417348&method=alipay.fund.auth.order.app.freeze&format=JSON&charset=utf-8&sign_type=RSA2&timestamp=2019-10-28+20%3A40%3A10&version=1.0&notify_url=https%3A%2F%2Flot.fubayun.com%2Falicallback.html&biz_content=%7B%22out_trade_no%22%3A%2215722664102660804841%22%2C%22out_request_no%22%3A%22157226641026608048411%22%2C%22amount%22%3A%220.01%22%2C%22order_title%22%3A%22%5Cu51bb%5Cu7ed3%5Cu8ba2%5Cu535515722664102660804841%22%2C%22body%22%3A%22%5Cu51bb%5Cu7ed3%5Cu8ba2%5Cu535515722664102660804841%22%2C%22product_code%22%3A%22PRE_AUTH_ONLINE%22%2C%22payee_user_id%22%3A%222088421520703464%22%2C%22extra_param%22%3A%22%7B%5C%22category%5C%22%3A%5C%22CHARGE_PILE_CAR%5C%22%7D%22%7D&sign=KDhCJwsgbVMJ7%2Fx1jn7eF91TKmG4a7NhC9PPFNap4hoLW9%2F2m9UDCEpdFYn7%2F3wx73xS325O62LyCAlBPYEGAMGo8p1EJbsdujan1LRGoKziGjCFYpCn2ERf76gXRC4vWWeI5gvdNidWTl5PmNGtyvCblZEFNe%2BrN3J2Z1cFOBpvK0May8m%2Bb76qJaW2dH%2BCcsczJjnkrrytS1TiLCzZUg%2FXhFUeFxMlG%2Fn89KWuyKEwEmUekNitQrXEeAd6YqvdmM8SFfJ7hAPFyJyxzZK02UAaJdl0zCA7Zw6kdquyarH4p%2BoMD9mHSulTcD0RZ6%2Bv5S8n0edwuJJNIsdV%2BzMHLA%3D%3D