feat: enhance HTTP/2 support by ensuring Host header is set and adding multiplexed request tests

rust/crates/rustproxy-http/src/proxy_service.rs

@@ -244,7 +244,10 @@ impl HttpProxyService {
             .map(|h| {
                 // Strip port from host header
                 h.split(':').next().unwrap_or(h).to_string()
-            });
+            })
+            // HTTP/2 uses :authority pseudo-header instead of Host;
+            // hyper maps it to the URI authority component
+            .or_else(|| req.uri().host().map(|h| h.to_string()));
 
         let path = req.uri().path().to_string();
         let method = req.method().clone();
@@ -397,11 +400,18 @@ impl HttpProxyService {
             }
         }
 
+        // Ensure Host header is set (HTTP/2 requests don't have Host; need it for h1 backends)
+        if !upstream_headers.contains_key("host") {
+            if let Some(ref h) = host {
+                if let Ok(val) = hyper::header::HeaderValue::from_str(h) {
+                    upstream_headers.insert(hyper::header::HOST, val);
+                }
+            }
+        }
+
         // Add standard reverse-proxy headers (X-Forwarded-*)
         {
-            let original_host = parts.headers.get("host")
+            let original_host = host.as_deref().unwrap_or("");
-                .and_then(|h| h.to_str().ok())
-                .unwrap_or("");
             let forwarded_proto = if route_match.route.action.tls.as_ref()
                 .map(|t| matches!(t.mode,
                     rustproxy_config::TlsMode::Terminate
@@ -574,10 +584,11 @@ impl HttpProxyService {
         source_ip: &str,
         pool_key: &crate::connection_pool::PoolKey,
     ) -> Result<Response<BoxBody<Bytes, hyper::Error>>, hyper::Error> {
+        // Always use HTTP/1.1 for h1 backend connections (h2 incoming requests have version HTTP/2.0)
         let mut upstream_req = Request::builder()
             .method(parts.method)
             .uri(upstream_path)
-            .version(parts.version);
+            .version(hyper::Version::HTTP_11);
 
         if let Some(headers) = upstream_req.headers_mut() {
             *headers = upstream_headers;
@@ -848,6 +859,7 @@ impl HttpProxyService {
 
         // Copy all original headers (preserving the client's Host header).
         // Skip X-Forwarded-* since we set them ourselves below.
+        let mut has_host_header = false;
         for (name, value) in parts.headers.iter() {
             let name_str = name.as_str();
             if name_str == "x-forwarded-for"
@@ -856,13 +868,25 @@ impl HttpProxyService {
             {
                 continue;
             }
+            if name_str == "host" {
+                has_host_header = true;
+            }
             raw_request.push_str(&format!("{}: {}\r\n", name, value.to_str().unwrap_or("")));
         }
 
+        // HTTP/2 requests don't have Host header; add one from URI authority for h1 backends
+        let ws_host = parts.uri.host().map(|h| h.to_string());
+        if !has_host_header {
+            if let Some(ref h) = ws_host {
+                raw_request.push_str(&format!("host: {}\r\n", h));
+            }
+        }
+
         // Add standard reverse-proxy headers (X-Forwarded-*)
         {
             let original_host = parts.headers.get("host")
                 .and_then(|h| h.to_str().ok())
+                .or(ws_host.as_deref())
                 .unwrap_or("");
             let forwarded_proto = if route.action.tls.as_ref()
                 .map(|t| matches!(t.mode,

rust/crates/rustproxy-passthrough/src/sni_parser.rs

@@ -196,6 +196,7 @@ pub fn is_http(data: &[u8]) -> bool {
         b"PATC",
         b"OPTI",
         b"CONN",
+        b"PRI ",   // HTTP/2 connection preface
     ];
     starts.iter().any(|s| data.starts_with(s))
 }

test/test.perf-improvements.ts

@@ -255,81 +255,62 @@ tap.test('HTTPS with TLS termination: multiple requests through TLS', async (too
 // ===========================================================================
 // 5. TLS ALPN negotiation verification
 // ===========================================================================
-tap.test('TLS ALPN negotiation: h2 advertised, h1.1 functional', async (tools) => {
+tap.test('HTTP/2 end-to-end: ALPN h2 with multiplexed requests', async (tools) => {
   tools.timeout(15000);
 
-  // Verify the Rust TLS layer advertises h2 via ALPN by inspecting a raw TLS socket
+  // Connect an HTTP/2 session over TLS
-  const alpnProtocol = await new Promise<string>((resolve, reject) => {
+  const session = http2.connect(`https://localhost:${PROXY_HTTPS_PORT}`, {
-    const socket = tls.connect(
+    rejectUnauthorized: false,
-      {
-        host: 'localhost',
-        port: PROXY_HTTPS_PORT,
-        ALPNProtocols: ['h2', 'http/1.1'],
-        rejectUnauthorized: false,
-        servername: 'localhost',
-      },
-      () => {
-        const proto = (socket as any).alpnProtocol || 'none';
-        socket.destroy();
-        resolve(proto);
-      },
-    );
-    socket.on('error', reject);
-    socket.setTimeout(5000, () => {
-      socket.destroy(new Error('timeout'));
-    });
   });
 
+  await new Promise<void>((resolve, reject) => {
+    session.on('connect', () => resolve());
+    session.on('error', reject);
+    setTimeout(() => reject(new Error('h2 connect timeout')), 5000);
+  });
+
+  // Verify ALPN negotiated h2
+  const alpnProtocol = (session.socket as tls.TLSSocket).alpnProtocol;
   console.log(`TLS ALPN negotiated protocol: ${alpnProtocol}`);
-  // Rust advertises h2+http/1.1; the negotiated protocol should be one of them
+  expect(alpnProtocol).toEqual('h2');
-  expect(['h2', 'http/1.1'].includes(alpnProtocol)).toBeTrue();
 
-  // Now try an actual HTTP/2 session — Rust may or may not support h2 end-to-end
+  // Send 5 multiplexed POST requests on the same h2 session
-  let h2Supported = false;
+  const REQUEST_COUNT = 5;
-  try {
+  const promises: Promise<{ status: number; body: string }>[] = [];
-    const session = http2.connect(`https://localhost:${PROXY_HTTPS_PORT}`, {
-      rejectUnauthorized: false,
-    });
 
-    await new Promise<void>((resolve, reject) => {
+  for (let i = 0; i < REQUEST_COUNT; i++) {
-      session.on('connect', () => resolve());
+    promises.push(
-      session.on('error', reject);
+      new Promise<{ status: number; body: string }>((resolve, reject) => {
-      setTimeout(() => reject(new Error('h2 connect timeout')), 5000);
+        const reqStream = session.request({
-    });
+          ':method': 'POST',
+          ':path': '/echo',
+          'content-type': 'text/plain',
+        });
 
-    // If we get here, h2 session connected. Try a request.
+        let data = '';
-    const result = await new Promise<{ status: number; body: string }>((resolve, reject) => {
+        let status = 0;
-      const reqStream = session.request({
-        ':method': 'POST',
-        ':path': '/echo',
-        'content-type': 'text/plain',
-      });
 
-      let data = '';
+        reqStream.on('response', (headers) => {
-      let status = 0;
+          status = headers[':status'] as number;
-
+        });
-      reqStream.on('response', (headers) => {
+        reqStream.on('data', (chunk: Buffer) => {
-        status = headers[':status'] as number;
+          data += chunk.toString();
-      });
+        });
-      reqStream.on('data', (chunk: Buffer) => {
+        reqStream.on('end', () => resolve({ status, body: data }));
-        data += chunk.toString();
+        reqStream.on('error', reject);
-      });
+        reqStream.end(`h2-msg-${i}`);
-      reqStream.on('end', () => resolve({ status, body: data }));
+      }),
-      reqStream.on('error', reject);
+    );
-      reqStream.end('h2-test');
-    });
-
-    expect(result.status).toEqual(200);
-    expect(result.body).toEqual('echo:h2-test');
-    h2Supported = true;
-
-    await new Promise<void>((resolve) => session.close(() => resolve()));
-  } catch {
-    // h2 end-to-end not yet supported — that's OK, h1.1 over TLS is verified above
-    console.log('HTTP/2 end-to-end not yet supported by Rust engine (expected)');
   }
 
-  console.log(`HTTP/2 full support: ${h2Supported ? 'yes' : 'no (ALPN advertised but h2 framing not handled)'}`);
+  const results = await Promise.all(promises);
+  for (let i = 0; i < REQUEST_COUNT; i++) {
+    expect(results[i].status).toEqual(200);
+    expect(results[i].body).toEqual(`echo:h2-msg-${i}`);
+  }
+
+  await new Promise<void>((resolve) => session.close(() => resolve()));
+  console.log(`HTTP/2 end-to-end: ${REQUEST_COUNT} multiplexed requests completed successfully`);
 });
 
 // ===========================================================================