On March 4, 2018, Contentful will be changing the domain from which user-generated assets are served in order to better isolate content from potentially malicious uploads. The change primarily affects users accessing Contentful through secure proxies or with security policies in place, requiring additional steps to update their configurations. User-generated assets will be served from the new `ctfassets.net` domain, while HTTP/2 performance improvements will also be implemented at the same time.