diff --git a/proxy/middle.go b/proxy/middle.go
index b387be8..a5d093c 100644
--- a/proxy/middle.go
+++ b/proxy/middle.go
@@ -73,7 +73,7 @@ type Middle struct {
 	Server   *http.Server
 }
 
-func NewMiddle(proxy *Proxy,caPath string) (Interceptor, error) {
+func NewMiddle(proxy *Proxy, caPath string) (Interceptor, error) {
 	ca, err := cert.NewCA(caPath)
 	if err != nil {
 		return nil, err
@@ -141,7 +141,8 @@ func (m *Middle) intercept(serverConn *connBuf) {
 		return
 	}
 
-	if buf[0] == 0x16 && buf[1] == 0x03 && (buf[2] >= 0x0 || buf[2] <= 0x03) {
+	// https://github.com/mitmproxy/mitmproxy/blob/main/mitmproxy/net/tls.py is_tls_record_magic
+	if buf[0] == 0x16 && buf[1] == 0x03 && (buf[2] >= 0x0 && buf[2] <= 0x03) {
 		// tls
 		m.Listener.(*listener).connChan <- serverConn
 	} else {