diff --git a/infra/conf/transport_internet.go b/infra/conf/transport_internet.go
index 071a9170..ee05dd33 100644
--- a/infra/conf/transport_internet.go
+++ b/infra/conf/transport_internet.go
@@ -1980,6 +1980,22 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 		if strings.EqualFold(c.Security, "reality") {
 			return nil, errors.New("sockopt.browserDialer does not support REALITY")
 		}
+		if config.ProtocolName == "splithttp" {
+			splitHTTPSettings := c.SplitHTTPSettings
+			if c.XHTTPSettings != nil {
+				splitHTTPSettings = c.XHTTPSettings
+			}
+			if splitHTTPSettings != nil {
+				splitHTTPSettingsCopy := *splitHTTPSettings
+				hs, err := splitHTTPSettingsCopy.Build()
+				if err != nil {
+					return nil, errors.New("Failed to build XHTTP config.").Base(err)
+				}
+				if splitHTTPConfig, ok := hs.(*splithttp.Config); ok && splitHTTPConfig.Mode != "auto" && splitHTTPConfig.Mode != "packet-up" {
+					return nil, errors.New("sockopt.browserDialer only supports XHTTP mode auto or packet-up")
+				}
+			}
+		}
 	}
 
 	switch strings.ToLower(c.Security) {
diff --git a/transport/internet/browser_dialer/dialer_test.go b/transport/internet/browser_dialer/dialer_test.go
index 73efa586..9384306f 100644
--- a/transport/internet/browser_dialer/dialer_test.go
+++ b/transport/internet/browser_dialer/dialer_test.go
@@ -1,10 +1,6 @@
 package browser_dialer
 
-import (
-	"net/http"
-	"strings"
-	"testing"
-)
+import "testing"
 
 func TestParseBrowserDialerAddressRequireUUIDPath(t *testing.T) {
 	valid := "127.0.0.1:8080/123e4567-e89b-12d3-a456-426614174000"
@@ -24,61 +20,3 @@ func TestParseBrowserDialerAddressRequireUUIDPath(t *testing.T) {
 		}
 	}
 }
-
-func TestGetDialerByAddressReusesExistingServerForSameListenAddress(t *testing.T) {
-	listenAddr := "127.0.0.1:39000"
-	server := &dialerServer{
-		server:     &http.Server{Addr: listenAddr},
-		pageRoutes: make(map[string]*dialerInstance),
-	}
-
-	mu.Lock()
-	oldDialers, oldServers := sockoptDialers, dialerServers
-	sockoptDialers = make(map[string]*dialerInstance)
-	dialerServers = map[string]*dialerServer{listenAddr: server}
-	mu.Unlock()
-	t.Cleanup(func() {
-		mu.Lock()
-		sockoptDialers = oldDialers
-		dialerServers = oldServers
-		mu.Unlock()
-	})
-
-	if _, err := getDialerByAddress(listenAddr + "/123e4567-e89b-12d3-a456-426614174000"); err != nil {
-		t.Fatalf("failed to create first dialer: %v", err)
-	}
-	if _, err := getDialerByAddress(listenAddr + "/123e4567-e89b-12d3-a456-426614174001"); err != nil {
-		t.Fatalf("failed to create second dialer on same listener: %v", err)
-	}
-	if len(dialerServers) != 1 {
-		t.Fatalf("expected one shared listener, got %d", len(dialerServers))
-	}
-}
-
-func TestGetDialerByAddressRejectsSamePortDifferentAddress(t *testing.T) {
-	listenAddr := "127.0.0.1:39001"
-	server := &dialerServer{
-		server:     &http.Server{Addr: listenAddr},
-		pageRoutes: make(map[string]*dialerInstance),
-	}
-
-	mu.Lock()
-	oldDialers, oldServers := sockoptDialers, dialerServers
-	sockoptDialers = make(map[string]*dialerInstance)
-	dialerServers = map[string]*dialerServer{listenAddr: server}
-	mu.Unlock()
-	t.Cleanup(func() {
-		mu.Lock()
-		sockoptDialers = oldDialers
-		dialerServers = oldServers
-		mu.Unlock()
-	})
-
-	_, err := getDialerByAddress("127.0.0.2:39001/123e4567-e89b-12d3-a456-426614174011")
-	if err == nil {
-		t.Fatal("expected error for same port with different listen address")
-	}
-	if !strings.Contains(err.Error(), "cannot use the same port with a different listen address") {
-		t.Fatalf("unexpected error: %v", err)
-	}
-}