Feature to allow downloads from http if available - proxy friendly but less secure

Original title: Make choco cache proxy friendly by trying to donwload packages from http instead https

If you have automated tests running every night, which prepares x virtual machines, which install x chocolatey packages, thus download many installers, it is at the end a lot of gigabytes that you download every night, and they are always the same gigabytes! A cache proxy in the middle would boost the performances exponentially, and chocolatey support already this feature, but alas cache proxies work with http but not with https, and now a days is very common that chocolatey packages include the https version of the download link of the installers, although the old good http version of the download link is also working. It would be very environment friendly if it would be possible to instruct vagrant to download the installers from http instead of https when it is available. In this case a cache proxy in the middle would be very efficient and would reduce the used bandwidth in internet, therefore the consumption of electricity and the emissions of CO2.