FrontendHaltNetworking·Intermediate·Conceptual·1 min read
Why is domain sharding an anti-pattern under HTTP/2?
Short interview answer
Sharding split assets across subdomains to get past the six-connection-per-origin limit. Under HTTP/2 that limit is gone, and each extra domain now costs a fresh DNS lookup, TCP handshake, and TLS negotiation, and fragments the single connection's multiplexing and prioritization.
Key takeaway
Explain the underlying mental model clearly, then support it with a concrete example and its trade-offs.