Add HTTP/2 support via auto protocol detection

Use hyper-util auto builder to handle both HTTP/1.1 and HTTP/2
connections. CONNECT upgrades remain available on HTTP/1.1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: madeye

Cargo.toml

@@ -14,8 +14,8 @@ futures = "0.3"
 base64 = "0.22"
 clap = { version = "4", features = ["derive"] }
 http-body-util = "0.1"
-hyper = { version = "1", features = ["http1", "server", "client"] }
-hyper-util = { version = "0.1", features = ["tokio", "http1", "server-auto", "client-legacy"] }
+hyper = { version = "1", features = ["http1", "http2", "server", "client"] }
+hyper-util = { version = "0.1", features = ["tokio", "http1", "http2", "server-auto", "client-legacy"] }
 libc = "0.2"
 serde = { version = "1", features = ["derive"] }
 socket2 = { version = "0.5", features = ["all"] }

src/main.rs

@@ -130,12 +130,16 @@ async fn run_server(config_path: String) -> anyhow::Result<()> {
                 async move { handle_request(req, &shared).await }
             });
 
-            if let Err(e) = hyper::server::conn::http1::Builder::new()
-                .preserve_header_case(true)
-                .title_case_headers(true)
-                .serve_connection(io, service)
-                .with_upgrades()
-                .await
+            if let Err(e) = hyper_util::server::conn::auto::Builder::new(
+                hyper_util::rt::TokioExecutor::new(),
+            )
+            .http1()
+            .preserve_header_case(true)
+            .title_case_headers(true)
+            .http2()
+            .max_concurrent_streams(250)
+            .serve_connection_with_upgrades(io, service)
+            .await
             {
                 error!("{peer_addr}: connection error: {e}");
             }