use isahc::config::VersionNegotiation;
use isahc::prelude::*;
fn main() -> Result<(), isahc::Error> {
let response = Request::get("https://nghttp2.org")
.version_negotiation(VersionNegotiation::http2())
.body(())
.map_err(Into::into)
.and_then(isahc::send)?;
println!("{:?}", response.headers());
Ok(())
}