HTTP redirect:
$ curl -I http://ppa.launchpad.net/vbernat/haproxy-1.5/ubuntu
HTTP/1.1 301 Moved Permanently
Date: Thu, 09 Jan 2014 21:37:55 GMT
Server: Apache/2.2.14 (Ubuntu)
Location: http://ppa.launchpad.net/vbernat/haproxy-1.5/ubuntu/
Vary: Accept-Encoding
Content-Type: text/html; charset=iso-8859-1
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