Switch cryptography library & implement HSTS.
Fix for more recent bytestring versions. Otherwise it doesn't know which `strip` function to use...
Integrate new HTTP cache. And while I'm at it, implement HTTP redirects myself to report correct URIs to the caller & cache.
Add support for cache validation. This required redesigning the internal APIs & refactoring the code to read better.
Utilize the cache HURL's been writing!
Cache everything for supported status codes.
Write appropriate HTTP responses to the cache!
Implement key-value storage for caching (TODO limit disk usage)
Draft code to check whether to cachen an HTTP response.