错误 “SCRIPT7002: XMLHttpRequest: 网络错误 0x2ef3, ie浏览器兼容问题

参考：https://www.telerik.com/blogs/help!-running-fiddler-fixes-my-app-

https://www.cnblogs.com/OpenCoder/p/5088104.html

https://www.cnblogs.com/OpenCoder/p/5089258.html

主要是因为keep-alive造成的问题

We also encountered similar problems. However, setting the charset as noted in the previous comment did not help. Our application was making an AJAX request every 60 seconds and our webserver, nginx, was sending Keep-Alive timeout at 60 seconds.

We fixed the problem by setting the keep-alive timeout value to 75 seconds.

This is what we believe was happening:

1. IE makes an AJAX request every 60 seconds, setting Keep-Alive in the request.
2. At the same time, nginx knows that the Keep-Alive timeout value is ignored by IE, so it starts the TCP connection close process (in the case of FF/Chrome this is started by the client)
3. IE receives the close connection request for the previously sent request. Since this is not expected by IE, it throws an error and aborts.
4. nginx still seems to be responding to the request even though the connection is closed.

A Wireshark TCP dump would provide more clarity, our problem is fixed and we do not wish to spend more time on it.