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    <p>One problem with content negotiation (and with serving different content/headers to different user-agents) is proxy servers. Considering the following; I ran into this back in the Netscape 4 days and have been shy of server side sniffing ever since.</p> <p>User A downloads your page with Firefox, and gets a XHTML/XML Content-Type. The user's ISP has a proxy server between the user and your site, so this page is now cached.</p> <p>User B, same ISP, requests your page using Internet Explorer. The request hits the proxy first, the proxy says "hey, I have that page, here it is; as <strong>application/xhtml+xml</strong>". User B is prompted to download the file (as IE will download anything sent as application/xhtml+xml.</p> <p>You can get around this particular issue by using the <a href="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html" rel="nofollow noreferrer">Vary Header</a>, as described in this <a href="http://www.456bereastreet.com/archive/200408/content_negotiation/" rel="nofollow noreferrer">456 Berea Street</a> article. I also assume that proxy servers have gotten a bit smarter about auto detecting these things.</p> <p>Here's where the <a href="https://stackoverflow.com/questions/348736/xhtml-is-writing-self-closing-tags-for-elements-not-traditionally-empty-bad-pra">CF that is HTML/XHTML</a> starts to creep in. When you use content negotiation to serve application/xhtml+xml to one set of user-agents, and text/html to another set of user agents, you're relying on all the proxies between your server and your users to be well behaved. </p> <p>Even if all the proxy servers in the world were smart enough to recognize the Vary header (they aren't) you still have to contend with the computer janitors of the world. There are a lot of smart, talented, and dedicated IT professionals in the world. There are more not so smart people who spend their days double clicking installer applications and thinking "The Internet" is that blue E in their menu. A mis-configured proxy could still improperly cache pages and headers, leaving you out of luck.</p>
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    1. POWhat are the problems associated with serving pages with Content: application/xhtml+xml
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    1. USAlan Storm
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    1. COInteresting Alan. I shall consider this. Maybe I'll just send 'em tag soup.
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    2. COAlso `Vary:` header disables caching of the resource in all major browsers (they don't support caching of multiple versions, so they play it safe and don't cache any version).
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