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39 lines
1.5 KiB
Markdown
39 lines
1.5 KiB
Markdown
---
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title: HTTP/2
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---
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import RenderCodeBlock from '@theme/CodeBlock';
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import CodeBlock from '@site/src/components/code_block.js';
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import { actixWebMajorVersion } from "@site/vars";
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`actix-web` automatically upgrades connections to *HTTP/2* if possible.
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# Negotiation
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<!-- TODO: use rustls example -->
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When either of the `rustls` or `openssl` features are enabled, `HttpServer` provides the [bind_rustls][bindrustls] method and [bind_openssl][bindopenssl] methods, respectively.
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<!-- DEPENDENCY -->
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<RenderCodeBlock className="language-toml">
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{`[dependencies]
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actix-web = { version = "${actixWebMajorVersion}", features = ["openssl"] }
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openssl = { version = "0.10", features = ["v110"] }
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`}
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</RenderCodeBlock>
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<CodeBlock example="http2" file="main.rs" section="main" />
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Upgrades to HTTP/2 described in [RFC 7540 §3.2][rfcsection32] are not supported. Starting HTTP/2 with prior knowledge is supported for both cleartext and TLS connections ([RFC 7540 §3.4][rfcsection34]) (when using the lower level `actix-http` service builders).
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> Check out [the TLS examples][examples] for concrete example.
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[rfcsection32]: https://httpwg.org/specs/rfc7540.html#rfc.section.3.2
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[rfcsection34]: https://httpwg.org/specs/rfc7540.html#rfc.section.3.4
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[bindrustls]: https://docs.rs/actix-web/4/actix_web/struct.HttpServer.html#method.bind_rustls
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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
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