2018-05-22 23:15:08 +02:00
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---
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title: HTTP/2.0
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menu: docs_proto
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weight: 250
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---
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`actix-web` automatically upgrades connections to *HTTP/2.0* if possible.
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# Negotiation
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*HTTP/2.0* protocol over tls without prior knowledge requires
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[tls alpn](https://tools.ietf.org/html/rfc7301).
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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
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2019-06-18 00:31:10 +02:00
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[bind_ssl](../../actix-web/actix_web/server/struct.HttpServer.html#method.serve_tls) method.
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2018-05-22 23:15:08 +02:00
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```toml
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[dependencies]
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2019-06-18 00:31:10 +02:00
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actix-web = { version = "{{< actix-version "actix-web" >}}", features = ["ssl"] }
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2018-05-22 23:15:08 +02:00
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openssl = { version = "0.10", features = ["v110"] }
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```
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2019-06-18 00:31:10 +02:00
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{{< include-example example="http20" file="main.rs" section="main" >}}
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2018-05-22 23:15:08 +02:00
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Upgrades to *HTTP/2.0* schema described in
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[rfc section 3.2](https://http2.github.io/http2-spec/#rfc.section.3.2) is not supported.
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Starting *HTTP/2* with prior knowledge is supported for both clear text connection
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and tls connection. [rfc section 3.4](https://http2.github.io/http2-spec/#rfc.section.3.4)
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> Check out [examples/tls](https://github.com/actix/examples/tree/master/tls)
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> for a concrete example.
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