HTTP/2 and HTTP/3 solve HTTP/1.1 limitations:
HTTP/2:
- Multiplexing: Multiple requests over one connection
- Header compression (HPACK)
- Server push: Send resources before requested
- Binary protocol (not text)
HTTP/3:
- Built on QUIC (UDP-based)
- Eliminates head-of-line blocking
- Faster connection establishment
- Better for mobile (connection migration)
HTTP/2 is widely supported. HTTP/3 adoption is growing. Both are backward compatible with HTTP/1.1 semantics.