Support for YARL and Hyperlink URL objects

[gwerbin]

It'd be really nice if HTTPX suported yarl.URL and hyperlink.EncodedURL/hyperlink.DecodedURL in addition to httpx.URL. The data models are pretty similar, and I think it should be possible to convert directly from any of these types to httpx.URL without round-tripping through str first.

Would the maintainers be open to a PR for this?

If so, would httpx.Request.__init__ be the right place to do this conversion? That seems to be the "entry point" where all non-URL objects are converted to URL: https://github.com/encode/httpx/blob/1.0.0.beta0/httpx/_models.py#L1092. For example, we could have a _convert_url helper function instead of calling URL directly.

Naturally, it would need to gracefully handle the case when either package is not available, and the type annotations would have to be updated.

[gwerbin]

I've been using HTTPX a lot and I'd still be very interested in helping contribute here.

[karpetrosyan]

Is it truly necessary? Adding such features is not cheap; it complicates the development process, introduces new dependencies, and so on.

[gwerbin]

No, it's definitely not necessary.