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➜ ~ openssl s_client -servername filippo.io -connect filosottile.github.io:443
CONNECTED(00000003)
depth=1 /C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 High Assurance Server CA
verify error:num=20:unable to get local issuer certificate
verify return:0
---
Certificate chain
0 s:/C=US/L=San Francisco/ST=California/O=Fastly, Inc./CN=www.github.com
i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 High Assurance Server CA
1 s:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert SHA2 High Assurance Server CA
i:/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert High Assurance EV Root CA
---
[...]
---
GET / HTTP/1.1
Host: filippo.io
HTTP/1.1 500 Domain Not Found
Date: Mon, 06 Apr 2015 20:02:35 GMT
Server: Varnish
Retry-After: 0
content-type: text/html
Cache-Control: private, no-cache
Content-Length: 97
Accept-Ranges: bytes
Via: 1.1 varnish
Connection: close
<html>
<head>
<title> filippo.io</title>
</head>
<body>
unknown domain: filippo.io</body></html>read:errno=0
➜ ~ telnet filosottile.github.io 80
Trying 23.235.43.133...
Connected to github.map.fastly.net.
Escape character is '^]'.
GET / HTTP/1.1
Host: filippo.io
HTTP/1.1 200 OK
Server: GitHub.com
Content-Type: text/html; charset=utf-8
Last-Modified: Mon, 10 Nov 2014 15:51:08 GMT
Expires: Mon, 06 Apr 2015 12:58:29 GMT
Cache-Control: max-age=600
Access-Control-Allow-Origin: *
Content-Length: 22672
Accept-Ranges: bytes
Date: Mon, 06 Apr 2015 20:03:06 GMT
Via: 1.1 varnish
Age: 0
Connection: keep-alive
X-Served-By: cache-ams4144-AMS
X-Cache: MISS
X-Cache-Hits: 0
X-Timer: S1428350586.203748,VS0,VE102
Vary: Accept-Encoding
<!DOCTYPE html>
<!--[if IEMobile 7 ]><html class="no-js iem7"><![endif]-->
<!--[if lt IE 9]><html class="no-js lte-ie8"><![endif]-->
<!--[if (gt IE 8)|(gt IEMobile 7)|!(IEMobile)|!(IE)]><!--><html class="no-js" lang="en"><!--<![endif]-->
<head>
<meta charset="utf-8">
<title>PyTux | Trips of a curious penguin</title>
<meta name="author" content="Filippo Valsorda">
[...]
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