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actix-website/docs/http2.md
2024-03-02 17:30:56 +00:00

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---
title: HTTP/2
---
import RenderCodeBlock from '@theme/CodeBlock'; import CodeBlock from '@site/src/components/code_block.js'; import { actixWebMajorVersion } from "@site/vars";
`actix-web` automatically upgrades connections to _HTTP/2_ if possible.
# Negotiation
<!-- TODO: use rustls example -->
When either of the `rustls` or `openssl` features are enabled, `HttpServer` provides the [`bind_rustls()`][bindrustls] method and [`bind_openssl()`][bindopenssl] methods, respectively.
<!-- DEPENDENCY -->
<CodeBlock example="http2" file="manifest" section="deps" language="toml"></CodeBlock>
<CodeBlock example="http2" file="main.rs" section="main" />
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).
> Check out [the TLS examples][examples] for concrete example.
[rfcsection32]: https://httpwg.org/specs/rfc7540.html#rfc.section.3.2
[rfcsection34]: https://httpwg.org/specs/rfc7540.html#rfc.section.3.4
[bindrustls]: https://docs.rs/actix-web/4/actix_web/struct.HttpServer.html#method.bind_rustls_0_22
[bindopenssl]: https://docs.rs/actix-web/4/actix_web/struct.HttpServer.html#method.bind_openssl
[tlsalpn]: https://tools.ietf.org/html/rfc7301
[examples]: https://github.com/actix/examples/tree/master/https-tls