@shankerwangmiao
curl -v https://mirrors.tuna.tsinghua.edu.cn/ubuntu/;
* Trying 166.111.206.178...
* Connected to mirrors.tuna.tsinghua.edu.cn (166.111.206.178) port 443 (#0)
* found 173 certificates in /etc/ssl/certs/ca-certificates.crt
* found 692 certificates in /etc/ssl/certs
* ALPN, offering http/1.1
* SSL connection using TLS1.2 / ECDHE_RSA_AES_256_GCM_SHA384
* server certificate verification OK
* server certificate status verification SKIPPED
* common name: *.tuna.tsinghua.edu.cn (matched)
* server certificate expiration date OK
* server certificate activation date OK
* certificate public key: RSA
* certificate version: #3
* subject: OU=Domain Control Validated,CN=*.tuna.tsinghua.edu.cn
* start date: Mon, 03 Nov 2014 13:19:40 GMT
* expire date: Sun, 03 Nov 2019 04:11:15 GMT
* issuer: C=BE,O=GlobalSign nv-sa,CN=AlphaSSL CA - SHA256 - G2
* compression: NULL
* ALPN, server did not agree to a protocol
> GET /ubuntu/ HTTP/1.1
> Host: mirrors.tuna.tsinghua.edu.cn
> User-Agent: curl/7.47.0
> Accept: */*
>
< HTTP/1.1 200 OK
< Server: nginx/1.10.2
< Date: Sat, 31 Dec 2016 06:03:45 GMT
< Content-Type: text/html
< Transfer-Encoding: chunked
< Connection: keep-alive
< Strict-Transport-Security: max-age=31536000
< X-TUNA-MIRROR-ID: nanomirrors
<
<html>
<head><title>Index of /ubuntu/</title></head>
<body bgcolor="white">
<h1>Index of /ubuntu/</h1><hr><pre><a href="../">../</a>
<a href="dists/">dists/</a> 18-Oct-2016 08:56 -
<a href="indices/">indices/</a> 31-Dec-2016 03:38 -
<a href="pool/">pool/</a> 27-Feb-2010 06:30 -
<a href="project/">project/</a> 28-Jun-2013 11:52 -
<a href="ubuntu/">ubuntu/</a> 31-Dec-2016 04:03 -
<a href="ls-lR.gz">ls-lR.gz</a> 31-Dec-2016 03:58 15081865
</pre><hr></body>
</html>
* Connection #0 to host mirrors.tuna.tsinghua.edu.cn left intact
