⚡ HTTP/2 & HTTP/3 Test
Check which HTTP protocol versions a website supports
📚 About HTTP Protocol Versions
Modern HTTP protocol versions significantly improve website performance. Here's what each version offers:
HTTP/1.1
- Released in 1997
- One request per connection
- Head-of-line blocking
- No header compression
HTTP/2
- Released in 2015
- Multiplexing (multiple requests)
- Header compression (HPACK)
- Server push capability
HTTP/3 (QUIC)
- Released in 2022
- Uses UDP instead of TCP
- 0-RTT connection setup
- Better mobile performance
Performance Improvements
| Metric | HTTP/1.1 | HTTP/2 | HTTP/3 |
|---|---|---|---|
| Connection Setup | ~100ms | ~100ms | ~0ms (0-RTT) |
| Multiplexing | ❌ | ✅ | ✅ |
| Header Compression | ❌ | ✅ HPACK | ✅ QPACK |