按照以下的代码测试的跨域访问请求和响应信息如下：
General：
Request URL:http://server-b.com/test.txt
Referrer Policy:no-referrer-when-downgrade
Request Headers：
Accept:*/*
Response Headers：
Accept-Ranges:bytes
Access-Control-Allow-Origin:http://server-a.com
Ali-Swift-Global-Savetime:1584429767
Connection:keep-alive
Content-Length:6
Content-Type:text/plain; charset=UTF-8
Date:Tue, 17 Mar 2020 07:22:47 GMT
EagleId:7ae122a015844297678574758e
ETag:"6-5a107cbc6939e"
Last-Modified:Tue, 17 Mar 2020 07:22:19 GMT
Server:Tengine
Timing-Allow-Origin:*
Via:cache45.l2cn1824[81,200-0,M], cache8.l2cn1824[82,0], cache8.l2cn1824[83,0], kunlun2.cn24[90,200-0,M], kunlun2.cn24[91,0]
X-Cache:MISS TCP_MISS dirn:-2:-2
X-Swift-CacheTime:10