Enable h2 ALPN with rustls-tls backend

Cargo.toml

@@ -35,7 +35,7 @@ tokio-timer = "0.2.6" # a minimum version so trust-dns-resolver compiles
 trust-dns-resolver = { version = "0.10", optional = true }
 url = "1.2"
 uuid = { version = "0.7", features = ["v4"] }
-hyper-rustls = { version = "0.15", optional = true }
+hyper-rustls = { version = "0.15.1", optional = true }
 tokio-rustls = { version = "0.8", optional = true }
 webpki-roots = { version = "0.15", optional = true }
 rustls = { version = "0.14", features = ["dangerous_configuration"], optional = true }

src/async_impl/client.rs

@@ -142,6 +142,10 @@ impl ClientBuilder {
                     use ::tls::NoVerifier;
 
                     let mut tls = ::rustls::ClientConfig::new();
+                    tls.set_protocols(&[
+                        "h2".into(),
+                        "http/1.1".into(),
+                    ]);
                     tls.root_store.add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
 
                     if !config.certs_verification {