Protected CSS on website? [closed]

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I've been开发者_运维问答 trying to view the file master.css over at http://www.campaignmonitor.com/ but for some reason I can't. Is it protected? I even tried using Firebug but even that refuses to display it. Is there some kind of protection for CSS in here we don't know about?

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It is not protected, the file is simply empty. If you inspect the response header, you will find this:

HTTP/1.1 200 OK
Accept-Ranges: bytes
Cache-Control: max-age=86400, public
Content-Type: text/css
Date: Wed, 17 Aug 2011 19:32:34 GMT
ETag: "2bf639-0-495dab735ad00"
Last-Modified: Thu, 25 Nov 2010 06:28:36 GMT
Server: ECS (lhr/D38A)
X-Cache: HIT
Content-Length: 0

Note the last line. The Content-Length ^[Wikipedia] is 0.

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Since Firebug can't find any rules from that stylesheet being applied onto anything, I suspect that stylesheet is in fact totally empty. Bear in mind that that's not the only file being linked to for styles; there are others.

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The master.css file is indeed empty.

The Chrome Webkit Inspector gives me theses urls for the css used:

• http://i2.campaignmonitor.com/min/?g=screen&1303274490
• http://i2.campaignmonitor.com/min/?g=home&1285746846
• http://i2.campaignmonitor.com/min/?g=print&1219642618
• http://i3.campaignmonitor.com/themes/site_themes/default/css/master.css

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Maybe its an empty file.

The only way I know to protect is to deliver a CSS by PHP and check for referrer. Empty or wrong referrer leads to an empty file on the client-side. So if you try to load the styles not in context of the website, you would see nothing. You can also check for browser type and deliver the appropriate styles.

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The css file is just empty.

You can't protect a css file. If so; how would your browser know how to render it?

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I don't think it is any kind of protection. It looks like a mistake to me. The master.css file looks blank for some reason. The styling is coming from the other CSS files (http://i2.campaignmonitor.com/min/?g=screen&1303274490, http://i2.campaignmonitor.com/min/?g=home&1285746846, http://i2.campaignmonitor.com/min/?g=print&1219642618).

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It has the best protection there is The file is empty. :-)

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It's just an empty file... Theres nothing to see...

Check this out: