请求URL：https://api.mch.weixin.qq.com/v3/applyment4sub/applyment/

请求方式：POST

返回header：HTTP/1.1 100 Continue HTTP/1.1 500 Internal Server Error Server: nginx Date: Sun, 05 Jan 2020 06:48:37 GMT Content-Type: application/json; charset=utf-8 Content-Length: 66 Connection: keep-alive Keep-Alive: timeout=8 Cache-Control: no-cache, must-revalidate X-Content-Type-Options: nosniff Request-ID: gc24g5

返回body：{"code":"SYSTEM_ERROR","message":"系统繁忙，请稍后重试"}