http conflict with axum

[JamesMc86]

I've been trying to get this working with axum however there is a dependency conflict as axum depends on v1 of the http crate.

I see you have examples for warp which uses an old version of the crate so the only direct way to support both would be a feature flag. In my case I can probably use warp instead and hopefully everyone will be on 1.0 soon.

[JamesMc86]

Just seen there is already PR #22 where someone has looked on this but not the compatibility for other frameworks.