C#访问https返回508空值问题

[u012509781]

请求地址：https://115.159.231.79/zzx/transfer/confirmReceipt
Head
Accept: */*
Accept-Encoding: gzip,deflate
Accept-Language: zh-Hans-CN;q=1
Connection: keep-alive
Content-Length: 65
Content-Type: application/x-www-form-urlencoded
Cookie: tk=f6f24f9e2f2f05430c5bf48677d0e375b62b6f56;uid=188843132354572160;lon=118.1717153799041;idfa=F38DB361-5E60-4CEB-A17D-D65D17FB8AC3;brand=Apple;PPU="TT=2d5b3789d67419e8a11fa835bb7bfd2436d997a6&UID=188843132354572160&SF=ZHUANZHUAN&SCT=1560691135394&V=1&ET=1563279535394"; Version=1; Domain=zhuanzhuan.com; Max-Age=2592000; Expires=Tue, 16-Jul-2019 12:28:39 GMT;;lat=24.49137198962889;t=16;sts=1560687918232;model=iPhone10%2C3;v=6.9.1;zz_t=16;
Host: 115.159.231.79
User-Agent: zhuanzhuan/6.9.1 (iPhone; iOS 12.3.1; Scale/3.00)
Post参数
price_f=100&orderId=1140235437286877801&logisticsCompany=mianjiao
返回
HTTP/1.1 508
Server: Tengine
Date: Sun, 16 Jun 2019 18:24:56 GMT
Content-Length: 0
Connection: keep-alive 以下是用thor探测到的