You shoud modify the constructor for the Feed class to mimic the standard Django Feed, in that it should store the request object as a Feed attribute, thus allowing one to exploit RequestSite to get an xml:base attribute.

So, want this as constructor in Feed (in atom.py): def init(self, slug, request): ''' Save constructor attributes ''' self.slug=slug self.request=request

When that's done, one can use the request object a local method (say self._mydomain, and then use your feed_extra_attrs to set xml:base.

def _mydomain(self): ... code manipulates self.request ...

def feed_extra_attrs(self,model): return {'xml:base':self._mydomain()}