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36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
---
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title: HTTP/2
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menu: docs_protocols
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weight: 250
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---
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`actix-web` automatically upgrades connections to _HTTP/2_ if possible.
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# Negotiation
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_HTTP/2_ protocol over TLS without prior knowledge requires [TLS ALPN][tlsalpn].
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<!-- TODO: use rustls example -->
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> Currently, only `rust-openssl` has support.
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`alpn` negotiation requires enabling the feature. When enabled, `HttpServer` provides the [bind_openssl][bindopenssl] method.
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```toml
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[dependencies]
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actix-web = { version = "{{< actix-version "actix-web" >}}", features = ["openssl"] }
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openssl = { version = "0.10", features = ["v110"] }
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```
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{{< include-example example="http2" file="main.rs" section="main" >}}
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Upgrades to _HTTP/2.0_ schema described in [rfc section 3.2][rfcsection32] is not supported. Starting _HTTP/2_ with prior knowledge is supported for both clear text connection and tls connection. [rfc section 3.4][rfcsection34].
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> Check out [examples/tls][examples] for a concrete example.
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[rfcsection32]: https://http2.github.io/http2-spec/#rfc.section.3.2
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[rfcsection34]: https://http2.github.io/http2-spec/#rfc.section.3.4
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[bindopenssl]: https://docs.rs/actix-web/4/actix_web/struct.HttpServer.html#method.bind_openssl
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[tlsalpn]: https://tools.ietf.org/html/rfc7301
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[examples]: https://github.com/actix/examples/tree/master/https-tls/rustls
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