Automatic content-type negotiation

[idanso]

While delivering mostly validating xhtml content, wordpress does not currently support sending it's documents as application/xhtml+xml mime type:
​http://www.w3.org/TR/xhtml-media-types/

There is a "hidden pref" in 1.5 that allows setting an explicit content-type('html_type'), but it performs no content negotiation, thus blocking non-xhtml browsers.]

This patch obsoletes the 'html_type' pref, and introduces 'use_xhtml_mime' instead. when enabled, it sends application/xhtml+xml or text/html based on information from the "Accept" header.

[matt]

Making the switch to application/xhtml+xml should be a concious decision on the part of the weblog author and should require a little work.

[idanso]

The application/xhtml+xml support is _optional_ and _disabled_ by default. it is only enabled if the web author chooses too.

[markjaquith]

The problem I see is that random users might check that box, not knowing what it is. It's rather one of those things where if you're geeky enough to want to do this, you're geeky enough to figure out how to do. But that's just my take.