Hyper 1.0 support

[davidpdrsn]

Hyper is aiming to ship 1.0 this year and in the process making a lot of changes to the public API which will impact axum. We can discuss the changes here.

Off the top of my head the biggest changes will probably be

• Hyper dropping tower::Service support since tower-service wont be 1.0 in time.
• Moving hyper::Server into hyper-util. I don't think we should have a public dependency on hyper-util since breaking releases would cascade into axum.
• Removing hyper::Body (or possibly moving it into hyper-util). I think we should consider giving axum-core its own body type. Relevant to Middleware that change the request body have poor usability #1110

I haven't thought much about this yet but once 0.6.0 is out we start that work.

Relevant links

• Hyper 1.0 project board
• Hyper's roadmap

[genusistimelord]

I guess the newer FromRequestParts and IntoResponseParts functions and State help Cover the loss of tower::Service. But this will heavily affect every single layer-based library when and if you do update to the newest Hyper. So maybe we can improve and prepare all the Parts changes to make migration easier later. I am willing to switch my libraries over to using them so they can be used as Examples for other library makers to change theirs over too.

I'm guess hyper-util will be a faster change with more API breaking branch?

I think Axum should also have its own Body type. This would make it easier to Abstract the Body from different source's and allow you more flexibility over them.

[davidpdrsn]

I've started the work in #1882 but it's currently blocked by tower-http getting updated. That is blocked by figuring out how to implement the (de?)compression middleware.

[davidpdrsn]

An update on where we're at with regards to hyper 1.0 support:

• Sean is planning to ship hyper 1.0 on November 15th 2023. This is super exciting! I can't guarantee that axum will be ready on the same day but that's my goal.
• The majority of the work to port axum is done. See Update to latest versions of hyper and http-body #1882
• I've moved all issues, except this one, that were on the 0.7 milestone to a new 0.8 milestone. The focus for 0.7 is hyper 1.0 support. Other API changes will have to wait for the next major version.
• tower-http also needs to be updated. Most of that work is also done. See Upgrade to http-body 1.0 tower-rs/tower-http#348. The only thing missing is compression and decompression middleware.

Finally most of the high level utilities that were previously in hyper (such as hyper::Server) are being moved to hyper-util. hyper-util is still early in development and thus pretty lean in terms of the conveniences it offers. That probably will hurt axum's usability at bit at first. I wanna encourage people to submit patches to hyper-util. I have started contributing myself (hyperium/hyper-util#46).