Use HTTPX for HTTP/2

[dush]

https://gitlab.com/honeyryderchuck/httpx is ruby HTTP library with support for HTTP/2 without libcurl dependency.

[yuki24]

I have seen some critical issues in the http-2 gem (internally used by httpx) in the past, most notably igrigorik/http-2#73 and igrigorik/http-2#132. There is also igrigorik/http-2#144 that makes me a bit hesitant to use it as a dependency.

While libcurl and nghttp2 are not trivial dependencies, they have been used by billions of devices world-wide and a lot more reliable than http-2 (or almost all Ruby implementations). In the future, we should switch to a pure-Ruby implementation, but today is not the time to make the move.

[HoneyryderChuck]

I've only seen this now. I'm the httpx maintainer. I've forked the http-2 gem over 3 years ago, and made it pass all http/2 compliance checks, and it has been pretty solid for years now.

[yuki24]

It's been more than 3 years since the last activity and it's probably a good idea to re-visit this.

I'm not sure how long it will take though - I have been away from Android related projects in Ruby and I'm not even sure what people do to send push notifications. I'll re-open this issue so we know the conversation is up in the air.

[HoneyryderChuck]

I can fill in the information gaps where needed. I gave a look at the readme, and it seems you're using net-http-persistent. Httpx supports both http 1 and 2, and ships with a persistent plugin that should deliver the same functionality. By replacing one with the other, you could remove the libcurl based implementation.