Comment 4 for bug 1464064

some mirrors, e.g. https://mirrors.kernel.org/ubuntu/ do support https already, however there are other issues that would arise, such as mirrors with broken certs, or certs that don't match the multiple dns names for the server (see https://mirrors.us.kernel.org/ubuntu/ for example) supporting https optionally on the Canonical run mirrors is probably a good thing to do, and increasing the encrypted traffic sloshing about on the internet is always a good thing to do (it puts the needles in a bigger haystack).