Support both http 0.2 and 1.0

[Nemo157]

This implements the idea I had in #683, supporting both versions of http and with the planned breaking change to supporting TryFrom<http::request::Builder> instead of From<http::request::Builder> since it's non-breaking as a new feature.

[algesten]

Thanks!

The problem with this solve is that the implementations are mutually exclusive. That means if some project get diamond dependencies on ureq with different feature flags, the compilation might break completely.

cargo test --features http http-interop

The immediate problem can of course make one of the flags "win", but that wouldn't help impls that depend on one that doesn't win.

What are the drivers for solving the retaining of the old dependency?

[Nemo157]

The problem with this solve is that the implementations are mutually exclusive.

They aren't, they're entirely independent. cargo test --all-features works fine and using both features together from one build will work.

What are the drivers for solving the retaining of the old dependency?

Avoiding breakage of code relying on the previous API. If it had been documented that the http-interop feature wasn't going to be semver compatible then I would have avoided using it in my crate and just performed the conversion manually. I assume my crate is not going to be the only one hit by this incompatibility, I'm likely just the first to notice as I have a CI job that tests against updated dependencies daily.

[Nemo157]

Hmm, it's less than I thought, if I did this correctly these should be the only (published) crates that are likely currently broken with ureq 2.9.0:

> fd -0tf -Econfig.json '' crates.io-index | xargs -0 tail -qn1 | jq -r '.name as $name | .deps[] | select(.name == "ureq" and (.features | contains(["http-interop"]))) | $name'
crates-index
cargo-dl
cargo-features-manager
cargo-upgrades

EDIT: Quickly testing them, crates-index only has broken tests (and is the only library so there should be no transitive breakage), cargo-features-manager and cargo-upgrades both have broken normal builds.

[algesten]

Alright. Let's try to land this.

Would it be possible to duplicate src/http_interop.rs and have one file for http1 and one for http02, and that would give us a smaller diff?

[Nemo157]

Done. It doesn't really reduce the diff but it does probably make it more readable.

[algesten]

I'll do the rest here. Thanks!

[algesten]

In released version 2.9.1, renamed the http feature to http-crate since in the context of ureq, the name "http" is a bit too generic.

[MarijnS95]

Did you forget to remove this planned removal from https://github.com/algesten/ureq/blob/main/FUTURE.md, after borrowing the suggested implementation from it?