diff --git a/pkg/base/url.go b/pkg/base/url.go
index a2172ff1..83e74450 100644
--- a/pkg/base/url.go
+++ b/pkg/base/url.go
@@ -83,7 +83,7 @@ func (u *URL) RTSPPath() (string, bool) {
 	return path, true
 }
 
-// RTSPPathAndQuery returns the path and the query of a RTSP URL.
+// RTSPPathAndQuery returns the path and query of a RTSP URL.
 func (u *URL) RTSPPathAndQuery() (string, bool) {
 	var pathAndQuery string
 	if u.RawPath != "" {
@@ -104,6 +104,19 @@ func (u *URL) RTSPPathAndQuery() (string, bool) {
 	return pathAndQuery, true
 }
 
+// SetRTSPPathAndQuery sets the path and query of a RTSP URL.
+func (u *URL) SetRTSPPathAndQuery(pathAndQuery string) {
+	nu1 := &URL{
+		Scheme: u.Scheme,
+		Opaque: u.Opaque,
+		User:   u.User,
+		Host:   u.Host,
+		Path:   "/",
+	}
+	nu2, _ := ParseURL(nu1.String() + pathAndQuery)
+	*u = *nu2
+}
+
 // AddControlAttribute adds a control attribute to a RTSP url.
 func (u *URL) AddControlAttribute(controlPath string) {
 	if controlPath[0] != '?' {
diff --git a/serverconf_test.go b/serverconf_test.go
index 5c2ace55..557425cc 100644
--- a/serverconf_test.go
+++ b/serverconf_test.go
@@ -170,6 +170,22 @@ func (ts *testServ) handleConn(conn *ServerConn) {
 	}
 
 	onSetup := func(req *base.Request, th *headers.Transport, trackID int) (*base.Response, error) {
+		reqPath, ok := req.URL.RTSPPath()
+		if !ok {
+			return &base.Response{
+				StatusCode: base.StatusBadRequest,
+			}, fmt.Errorf("invalid path (%s)", req.URL)
+		}
+
+		switch conn.State() {
+		case ServerConnStateInitial, ServerConnStatePrePlay:
+			if reqPath != "teststream" {
+				return &base.Response{
+					StatusCode: base.StatusBadRequest,
+				}, fmt.Errorf("invalid path (%s)", req.URL)
+			}
+		}
+
 		return &base.Response{
 			StatusCode: base.StatusOK,
 			Header: base.Header{
diff --git a/serverconn.go b/serverconn.go
index 49d8fc97..a1817503 100644
--- a/serverconn.go
+++ b/serverconn.go
@@ -514,12 +514,8 @@ func (sc *ServerConn) handleRequest(req *base.Request) (*base.Response, error) {
 					trackID := int(tmp)
 
 					// remove track ID from path
-					nu := &base.URL{
-						Scheme: req.URL.Scheme,
-						Host:   req.URL.Host,
-						User:   req.URL.User,
-					}
-					nu, _ = base.ParseURL(nu.String() + pathAndQuery[:i])
+					nu := req.URL.Clone()
+					nu.SetRTSPPathAndQuery(pathAndQuery[:i])
 					req.URL = nu
 
 					return trackID, nil
diff --git a/track.go b/track.go
index d77cd08d..627acf1a 100644
--- a/track.go
+++ b/track.go
@@ -167,7 +167,7 @@ func (t *Track) URL() (*base.URL, error) {
 		return nil, fmt.Errorf("empty base url")
 	}
 
-	control := func() string {
+	controlAttr := func() string {
 		for _, attr := range t.Media.Attributes {
 			if attr.Key == "control" {
 				return attr.Value
@@ -177,13 +177,13 @@ func (t *Track) URL() (*base.URL, error) {
 	}()
 
 	// no control attribute, use base URL
-	if control == "" {
+	if controlAttr == "" {
 		return t.BaseURL, nil
 	}
 
 	// control attribute contains an absolute path
-	if strings.HasPrefix(control, "rtsp://") {
-		ur, err := base.ParseURL(control)
+	if strings.HasPrefix(controlAttr, "rtsp://") {
+		ur, err := base.ParseURL(controlAttr)
 		if err != nil {
 			return nil, err
 		}
@@ -196,7 +196,7 @@ func (t *Track) URL() (*base.URL, error) {
 
 	// control attribute contains a relative control attribute
 	ur := t.BaseURL.Clone()
-	ur.AddControlAttribute(control)
+	ur.AddControlAttribute(controlAttr)
 	return ur, nil
 }