Comment by Kenji

Uh, stupid question but how do you cache a website like for example this comment thread on hackernews? Suppose a DDoSer calls this comment thread a lot of times. The request has to go through to the server because when I hit F5 or post a comment myself, I see the comments in realtime. How do you handle that exactly? Does caching for a few seconds help already, or does the backbone push updated sites to the CDN server? I have no experience in DDos mitigation.