Updating to the following UnifiedPush version that adds HSTS support:

https://github.com/aerogear/aerogear-unifiedpush-server/commit/c295679fb09b4665b09d3754e381d59d24b3002c
Updating to the following SimplePush version:

https://github.com/aerogear/aerogear-simplepush-server/commit/8e5eed3db0757368c989340be590163d9134f946