As a side effect some feed readers do not load the logo (no unencrypted content on an encryptet page)
This seems to be caused by the
constructing the absolute URL "manually".
Instead this could be fixed by giving the context an ExternalServletURLFactory, simplifying the code a bit.
Ideally this would not only happen to that method but the complete RSS Feed production process. However it seems the Feed plugin has a lot of entry points ...