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Fixed comparison table HTTP/2 <-> HTTP/3 #35591

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guardrex merged 2 commits into from
Jun 8, 2025
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Fixed comparison table HTTP/2 <-> HTTP/3 #35591

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Fixed comparison table HTTP/2 <-> HTTP/3
gfoidl Jun 7, 2025
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guardrex Jun 8, 2025
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20 changes: 8 additions & 12 deletions aspnetcore/fundamentals/servers/kestrel/http3.md
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Expand Up @@ -27,18 +27,14 @@ uid: fundamentals/servers/kestrel/http3
* Is the latest version of the Hypertext Transfer Protocol.
* Builds on the strengths of `HTTP/2` while addressing some of its limitations, particularly in terms of performance, latency, reliability, and security.

+---------------+-------------------------+-------------------------+
| Feature | `HTTP/2` | `HTTP/3` |
+---------------+-------------------------+-------------------------+
| Transport | Uses [TCP](https://developer.mozilla.org/docs/Glossary/TCP) | Uses [QUIC](https://www.rfc-editor.org/rfc/rfc9000.html) |
| Layer | | |
| Connection | Slower due to TCP + TLS | Faster with 0-RTT QUIC |
| Setup | handshake | handshakes |
| Head-of-Line | Affected by TCP-level | Eliminated with QUIC |
| Blocking | blocking | stream multiplexing |
| Encryption | TLS over TCP | TLS is built into QUIC |
+---------------+-------------------------+-------------------------+

| Feature | `HTTP/2` | `HTTP/3` |
|--------------|-------------------------------------------------------------|----------------------------------------------------------|
| Transport | Uses [TCP](https://developer.mozilla.org/docs/Glossary/TCP) | Uses [QUIC](https://www.rfc-editor.org/rfc/rfc9000.html) |
| Connection | Slower due to TCP + TLS | Faster with 0-RTT QUIC |
| Setup | handshake | handshakes |
| Head-of-Line | Affected by TCP-level | Eliminated with QUIC |
| Blocking | blocking | stream multiplexing |
| Encryption | TLS over TCP | TLS is built into QUIC |

The key differences from `HTTP/2` to `HTTP/3` are:

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