Hi, When working with XHTML you have to be careful how to deliver it. The appropriate content type is application/xhtml+xml in which case the supporting browser will treat it as XML (for parsing, in the DOM and in CSS for example). However non-supporting browsers like IE will choke on that and offer you the page for download. Therefore you can alternatively serve it as text/html - with the disadvantage that it will be parsed and treated as HTML. Now, of course you can look into the Accept header to find out if the browser will support XHTML or not and serve it under an appropriate content type accordingly. The problem with that are the Accept headers that browsers actually send. Opera and FF ask for both media types, with the same preference, text/html coming first. IE doesn't ask for any HTML media type at all but just tells you that it accepts some other stuff and then anything with a preference of 1. So, the default conneg algorithm doesn't work here: If I register two variants, the HTML one coming first, then all browsers will get the HTML version. If I register two variants, the XHTML one coming first, then all browsers will get the XHTML version, even IE which doesn't support it. This situation was being recognised by the W3C and they came up with a custom conneg algorithm [1]. The idea is to only serve XHTML when it is explicitly listed in the Accept header - and when it is, give it precedence over HTML. They say there that you should do that for XHTML documents that follow the compatibility guidelines and therefore can be rendered by non-supporting browsers properly, so they don't really do conneg but just serve one variant with different media types. But of course nothing stops you from really writing two variants, one in HTML 4.01 and one in XHTML+SVG+MathML for example (the latter wouldn't be valid to serve as text/html at all).
So the question here is, can you think of an easy way to implement this custom conneg (or rather just Accept-header inspection) algorithm in Restlet? Thanks, Simon [1] http://www.w3.org/TR/2009/NOTE-xhtml-media-types-20090116/#media-types ------------------------------------------------------ http://restlet.tigris.org/ds/viewMessage.do?dsForumId=4447&dsMessageId=1076412
