diff --git a/ConnInfo.ts b/ConnInfo.ts
index 8df690a..623941c 100644
--- a/ConnInfo.ts
+++ b/ConnInfo.ts
@@ -3,5 +3,5 @@ export type ConnInfo = Readonly<{
     readonly localAddr: Deno.Addr;
     /** The remote address of the connection. */
     readonly remoteAddr: Deno.Addr;
-    alpnProtocol: string;
+    alpnProtocol: string | null;
 }>;
diff --git a/on_tcp_connection.ts b/on_tcp_connection.ts
index a2cb31f..2afc9e7 100644
--- a/on_tcp_connection.ts
+++ b/on_tcp_connection.ts
@@ -34,7 +34,7 @@ export async function on_tcp_connection({
     // const { alpnProtocol } = hand_shake_info;
     const conn_info: ConnInfo = {
         localAddr,
-        alpnProtocol: "http/1.1",
+        alpnProtocol: null,
         remoteAddr,
     };
     const httpConn = Deno.serveHttp(conn);
diff --git a/on_tls_connection.ts b/on_tls_connection.ts
index ac579be..35e8f3f 100644
--- a/on_tls_connection.ts
+++ b/on_tls_connection.ts
@@ -31,10 +31,10 @@ export async function on_tls_connection({
     const { localAddr, remoteAddr } = conn;
 
     const hand_shake_info = await conn.handshake();
-    const { alpnProtocol = "http/1.1" } = hand_shake_info;
+    const { alpnProtocol } = hand_shake_info;
     const conn_info: ConnInfo = {
         localAddr,
-        alpnProtocol: alpnProtocol ?? "http/1.1",
+        alpnProtocol: alpnProtocol,
         remoteAddr,
     };
     const httpConn = Deno.serveHttp(conn);