Django vs XHTML

I like to serve my pages as XHTML, and with the correct content-type header application/xhtml+xml when possible, and downgrade to text/html for XHTML-challenged browsers. Out of the box Django cannot do this, but luckily the middleware architecture comes to my rescue :)

So, since this is such a short and sweet piece of code, here it is:

import re

re_ct_xhtml = re.compile(r'^application/xhtml\+xml\b')
re_accept_xhtml = re.compile(r'\bapplication/xhtml\+xml\b')

class XHTMLAsHTMLMiddleware:
    """I change content-type application/xhtml+xml into text/html, if the
    browser does not support the XHTML content-type."""

    def process_response(self, request, response):
        if re_ct_xhtml.match(response['Content-Type']):
            accept = request.META.get('HTTP_ACCEPT', '')
            if not re_accept_xhtml.search(accept):
                ct = response['Content-Type']
                ct = ct.replace('application/xhtml+xml', 'text/html')
                response['Content-Type'] = ct

        return response

It is also available as ibofobi.middleware.xhtml in http://mel.ibofobi.dk/~sune/r/ibofobi.git.