diff --git a/net/ghttp/internal/client/client_request.go b/net/ghttp/internal/client/client_request.go
index 74f46675f..f74ec6042 100644
--- a/net/ghttp/internal/client/client_request.go
+++ b/net/ghttp/internal/client/client_request.go
@@ -251,6 +251,10 @@ func (c *Client) prepareRequest(method, url string, data ...interface{}) (req *h
 	} else {
 		req = req.WithContext(context.Background())
 	}
+	// Client agent.
+	if c.agent != "" {
+		req.Header.Set("User-Agent", c.agent)
+	}
 	// Custom header.
 	if len(c.header) > 0 {
 		for k, v := range c.header {
@@ -279,10 +283,6 @@ func (c *Client) prepareRequest(method, url string, data ...interface{}) (req *h
 	if len(c.authUser) > 0 {
 		req.SetBasicAuth(c.authUser, c.authPass)
 	}
-	// Client agent.
-	if c.agent != "" {
-		req.Header.Set("User-Agent", c.agent)
-	}
 	return req, nil
 }