Built-in TLS Support 🎯

[NiiightmareXD]

• I have looked for existing issues (including closed) about this

Feature Request

I think it would be better if Axum had built-in TLS support right now we can use low-level-rustls but it's unnecessarily hard I think it would be better if we had something like in (Actix)[https://actix.rs/docs/http2] which has bind_openssl function and doesn't need any other crates other than OpenSSL and Actix itself.

I can attempt to implement it myself if you believe it would be beneficial.

Motivation

Pretty much every web server uses TLS.

Proposal

The implementation should be easy it has been already done in (axum-server)[https://github.com/programatik29/axum-server] but it would be better if we didn't need to add another crate to project just to get TLS.

Alternatives

using axum-server, low-level-openssl, low-level-rustls and tls-rustls.

[davidpdrsn]

axum intentionally doesn’t have that built-in and I think I want it to stay that way.

In the future axum::serve will be generic over the listener and IO which will make it easier to plug-in a TLS acceptor. See #2479