diff --git a/README.md b/README.md
index da789f2a..f2dbf722 100644
--- a/README.md
+++ b/README.md
@@ -57,4 +57,3 @@ This software is released under the GPL-3.0 license.
 - [x] Redir proxy
 - [x] UDP support
 - [x] Connection manager
-- [ ] ~~Event API~~
diff --git a/component/gun/gun.go b/component/gun/gun.go
index 0da84a0d..d1eef3b8 100644
--- a/component/gun/gun.go
+++ b/component/gun/gun.go
@@ -167,7 +167,7 @@ func NewHTTP2Client(dialFn DialFn, tlsConfig *tls.Config) *http2.Transport {
 		state := cn.ConnectionState()
 		if p := state.NegotiatedProtocol; p != http2.NextProtoTLS {
 			cn.Close()
-			return nil, errors.New("http2: unexpected ALPN protocol " + p + "; want q" + http2.NextProtoTLS)
+			return nil, fmt.Errorf("http2: unexpected ALPN protocol %s, want %s", p, http2.NextProtoTLS)
 		}
 		return cn, nil
 	}
diff --git a/proxy/redir/udp.go b/proxy/redir/udp.go
index 74b47570..45a726e0 100644
--- a/proxy/redir/udp.go
+++ b/proxy/redir/udp.go
@@ -75,5 +75,5 @@ func handleRedirUDP(pc net.PacketConn, buf []byte, lAddr *net.UDPAddr, rAddr *ne
 		lAddr: lAddr,
 		buf:   buf,
 	}
-	tunnel.AddPacket(adapters.NewPacket(target, pkt, C.REDIR))
+	tunnel.AddPacket(adapters.NewPacket(target, pkt, C.TPROXY))
 }
diff --git a/tunnel/tunnel.go b/tunnel/tunnel.go
index 316e3f4c..77c24d88 100644
--- a/tunnel/tunnel.go
+++ b/tunnel/tunnel.go
@@ -335,7 +335,7 @@ func match(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
 			}
 
 			if metadata.NetWork == C.UDP && !adapter.SupportUDP() {
-				log.Debugln("%v UDP is not supported", adapter.Name())
+				log.Debugln("%s UDP is not supported", adapter.Name())
 				continue
 			}
 			return adapter, rule, nil