Comment 2 for bug 179983

Actually, we are using Zope's zope.app.content_types.guess_content_type() function here, and it returns "image/svg+xml" for such a file.

There are probably two parts here:

1. get proper Content-Encoding support in the librarian. We have a bug for this but I don't recall its ID.

2. Work out some way to mark .svgz and similar files with "Content-Encoding: gzip".