diff --git a/client_read_test.go b/client_read_test.go
index 326012d9..d28cb2be 100644
--- a/client_read_test.go
+++ b/client_read_test.go
@@ -15,6 +15,7 @@ import (
 	psdp "github.com/pion/sdp/v3"
 	"github.com/stretchr/testify/require"
 
+	"github.com/aler9/gortsplib/pkg/auth"
 	"github.com/aler9/gortsplib/pkg/base"
 	"github.com/aler9/gortsplib/pkg/headers"
 	"github.com/aler9/gortsplib/pkg/rtcpsender"
@@ -759,6 +760,26 @@ func TestClientReadAutomaticProtocol(t *testing.T) {
 			require.NoError(t, err)
 			require.Equal(t, base.Describe, req.Method)
 
+			v := auth.NewValidator("myuser", "mypass", nil)
+
+			err = base.Response{
+				StatusCode: base.StatusUnauthorized,
+				Header: base.Header{
+					"WWW-Authenticate": v.GenerateHeader(),
+				},
+			}.Write(bconn.Writer)
+			require.NoError(t, err)
+
+			req, err = readRequest(bconn.Reader)
+			require.NoError(t, err)
+			require.Equal(t, base.Describe, req.Method)
+
+			err = v.ValidateHeader(req.Header["Authorization"],
+				base.Describe,
+				mustParseURL("rtsp://localhost:8554/teststream"),
+				nil)
+			require.NoError(t, err)
+
 			track, err := NewTrackH264(96, []byte("123456"), []byte("123456"))
 			require.NoError(t, err)
 
@@ -823,11 +844,31 @@ func TestClientReadAutomaticProtocol(t *testing.T) {
 			require.NoError(t, err)
 			bconn = bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn))
 
+			req, err = readRequest(bconn.Reader)
+			require.NoError(t, err)
+			require.Equal(t, base.Setup, req.Method)
+
+			v = auth.NewValidator("myuser", "mypass", nil)
+
+			err = base.Response{
+				StatusCode: base.StatusUnauthorized,
+				Header: base.Header{
+					"WWW-Authenticate": v.GenerateHeader(),
+				},
+			}.Write(bconn.Writer)
+			require.NoError(t, err)
+
 			req, err = readRequest(bconn.Reader)
 			require.NoError(t, err)
 			require.Equal(t, base.Setup, req.Method)
 			require.Equal(t, mustParseURL("rtsp://localhost:8554/teststream/trackID=0"), req.URL)
 
+			err = v.ValidateHeader(req.Header["Authorization"],
+				base.Setup,
+				mustParseURL("rtsp://localhost:8554/teststream/trackID=0"),
+				nil)
+			require.NoError(t, err)
+
 			inTH = headers.Transport{}
 			err = inTH.Read(req.Header["Transport"])
 			require.NoError(t, err)
@@ -880,7 +921,7 @@ func TestClientReadAutomaticProtocol(t *testing.T) {
 			ReadTimeout: 1 * time.Second,
 		}
 
-		conn, err := c.DialRead("rtsp://localhost:8554/teststream")
+		conn, err := c.DialRead("rtsp://myuser:mypass@localhost:8554/teststream")
 		require.NoError(t, err)
 
 		frameRecv := make(chan struct{})
diff --git a/clientconn.go b/clientconn.go
index d4719d82..44c05217 100644
--- a/clientconn.go
+++ b/clientconn.go
@@ -897,7 +897,7 @@ func (cc *ClientConn) do(req *base.Request, skipResponse bool) (*base.Response,
 		cc.session = sx.Session
 	}
 
-	// setup authentication
+	// if required, send request again with authentication
 	if res.StatusCode == base.StatusUnauthorized && req.URL.User != nil && cc.sender == nil {
 		pass, _ := req.URL.User.Password()
 		user := req.URL.User.Username()
@@ -908,7 +908,6 @@ func (cc *ClientConn) do(req *base.Request, skipResponse bool) (*base.Response,
 		}
 		cc.sender = sender
 
-		// send request again
 		return cc.do(req, false)
 	}
 
@@ -1036,7 +1035,7 @@ func (cc *ClientConn) doDescribe(u *base.URL) (Tracks, *base.Response, error) {
 	}
 
 	baseURL, err := func() (*base.URL, error) {
-		// prefer Content-Base (optional)
+		// use Content-Base
 		if cb, ok := res.Header["Content-Base"]; ok {
 			if len(cb) != 1 {
 				return nil, fmt.Errorf("invalid Content-Base: '%v'", cb)
@@ -1047,10 +1046,13 @@ func (cc *ClientConn) doDescribe(u *base.URL) (Tracks, *base.Response, error) {
 				return nil, fmt.Errorf("invalid Content-Base: '%v'", cb)
 			}
 
+			// add credentials from URL of request
+			ret.User = u.User
+
 			return ret, nil
 		}
 
-		// if not provided, use DESCRIBE URL
+		// if not provided, use URL of request
 		return u, nil
 	}()
 	if err != nil {
diff --git a/pkg/auth/validator.go b/pkg/auth/validator.go
index 71199c90..ea8bb488 100644
--- a/pkg/auth/validator.go
+++ b/pkg/auth/validator.go
@@ -10,7 +10,7 @@ import (
 	"github.com/aler9/gortsplib/pkg/headers"
 )
 
-// Validator allows to validate some credentials generated by a Sender.
+// Validator allows to validate credentials generated by a Sender.
 type Validator struct {
 	user       string
 	userHashed bool