调用接口 https://developer.toutiao.com/api/apps/v2/jscode2session
返回如下信息
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">^M
<html>^M
<head><title>504 Gateway Time-out</title></head>^M
<body>^M
<h1>504 Gateway Time-out</h1>^M
<p>The gateway did not receive a timely response from the upstream server or application.<hr/>Powered by Tengine</body>^M
</html
并发量并不大，请问是什么原因