Some user agents don't understand protocol-relative urls in some circumstances

[GoogleCodeExporter]

http://www.stevesouders.com/blog/2010/02/10/5a-missing-schema-double-download/

Internet Explorer 7 & 8 will download stylesheets twice if the http(s) protocol 
is missing.

For example: <link type="text/css" rel="stylesheet" 
href="//www.google.com/phone/static/2496921881-SiteCss.css">

We should investigate this. Perhaps stripping the protocol could be making 
sites slower on some IE browsers.

Original issue reported on code.google.com by jmaes...@google.com on 28 Jun 2011 at 8:39

[GoogleCodeExporter]

We've disabled protocol-relative url shortening in head.  We'll consider 
re-enabling it (with a user-agent check) if there's demand, but the savings 
after compression are generally small.

Original comment by jmaes...@google.com on 13 Jul 2011 at 6:07

• Changed state: Fixed