For HTTP, an external load balancer/CDN such as CloudFlare or Fastly could easily fulfill that role, though you obviously have to jump through a few more hoops

For HTTP, an external load balancer/CDN such as CloudFlare or Fastly could easily fulfill that role, though you obviously have to jump through a few more hoops to get there, since it's not built in. But with some of them you also get things like TLS termination, DNS hosting, advanced rewriting, caching, and DDOS protection.