diff --git a/cef/aux_viewsource.go b/cef/aux_viewsource.go
index 0ae3fc27..7cdbf6ba 100644
--- a/cef/aux_viewsource.go
+++ b/cef/aux_viewsource.go
@@ -43,7 +43,14 @@ func (m *ICefBrowser) createBrowserViewSource() {
 			}
 			if assetserve.AssetsServerHeaderKeyValue != "" {
 				viewSourceWindow.Chromium().SetOnBeforeResourceLoad(func(sender lcl.IObject, browser *ICefBrowser, frame *ICefFrame, request *ICefRequest, callback *ICefCallback, result *TCefReturnValue) {
-					request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+					if application.IsSpecVer49() {
+						headerMap := request.GetHeaderMap()
+						headerMap.Append(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue)
+						request.SetHeaderMap(headerMap)
+						headerMap.Free()
+					} else {
+						request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+					}
 				})
 			}
 			viewSourceWindow.Chromium().SetOnBeforePopup(func(sender lcl.IObject, browser *ICefBrowser, frame *ICefFrame, beforePopupInfo *BeforePopupInfo, popupFeatures *TCefPopupFeatures, windowInfo *TCefWindowInfo, client *ICefClient, settings *TCefBrowserSettings, resultExtraInfo *ICefDictionaryValue, noJavascriptAccess *bool) bool {
diff --git a/cef/browser_window_lcl.go b/cef/browser_window_lcl.go
index b8780d64..4426de8e 100644
--- a/cef/browser_window_lcl.go
+++ b/cef/browser_window_lcl.go
@@ -897,7 +897,14 @@ func (m *LCLBrowserWindow) registerDefaultEvent() {
 	})
 	m.Chromium().SetOnBeforeResourceLoad(func(sender lcl.IObject, browser *ICefBrowser, frame *ICefFrame, request *ICefRequest, callback *ICefCallback, result *consts.TCefReturnValue) {
 		if assetserve.AssetsServerHeaderKeyValue != "" {
-			request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			if application.IsSpecVer49() {
+				headerMap := request.GetHeaderMap()
+				headerMap.Append(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue)
+				request.SetHeaderMap(headerMap)
+				headerMap.Free()
+			} else {
+				request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			}
 		}
 		if bwEvent.onBeforeResourceLoad != nil {
 			bwEvent.onBeforeResourceLoad(sender, browser, frame, request, callback, result, m)
diff --git a/cef/browser_window_views_framework.go b/cef/browser_window_views_framework.go
index 39da6ae8..11eb264b 100644
--- a/cef/browser_window_views_framework.go
+++ b/cef/browser_window_views_framework.go
@@ -370,7 +370,14 @@ func (m *ViewsFrameworkBrowserWindow) registerDefaultEvent() {
 	})
 	m.Chromium().SetOnBeforeResourceLoad(func(sender lcl.IObject, browser *ICefBrowser, frame *ICefFrame, request *ICefRequest, callback *ICefCallback, result *consts.TCefReturnValue) {
 		if assetserve.AssetsServerHeaderKeyValue != "" {
-			request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			if application.IsSpecVer49() {
+				headerMap := request.GetHeaderMap()
+				headerMap.Append(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue)
+				request.SetHeaderMap(headerMap)
+				headerMap.Free()
+			} else {
+				request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			}
 		}
 		if bwEvent.onBeforeResourceLoad != nil {
 			bwEvent.onBeforeResourceLoad(sender, browser, frame, request, callback, result, m)
diff --git a/cef/tray_views_frame_commponent_windows.go b/cef/tray_views_frame_commponent_windows.go
index 07d05289..4dcdf444 100644
--- a/cef/tray_views_frame_commponent_windows.go
+++ b/cef/tray_views_frame_commponent_windows.go
@@ -108,7 +108,14 @@ func (m *ViewsFrameTray) registerChromiumEvent() {
 	})
 	m.trayWindow.Chromium().SetOnBeforeResourceLoad(func(sender lcl.IObject, browser *ICefBrowser, frame *ICefFrame, request *ICefRequest, callback *ICefCallback, result *consts.TCefReturnValue) {
 		if assetserve.AssetsServerHeaderKeyValue != "" {
-			request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			if application.IsSpecVer49() {
+				headerMap := request.GetHeaderMap()
+				headerMap.Append(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue)
+				request.SetHeaderMap(headerMap)
+				headerMap.Free()
+			} else {
+				request.SetHeaderByName(assetserve.AssetsServerHeaderKeyName, assetserve.AssetsServerHeaderKeyValue, true)
+			}
 		}
 	})
 	m.trayWindow.Chromium().SetOnBeforeClose(func(sender lcl.IObject, browser *ICefBrowser) {
diff --git a/cef/types_string_multi_map.go b/cef/types_string_multi_map.go
index 099e35ca..7279e4a4 100644
--- a/cef/types_string_multi_map.go
+++ b/cef/types_string_multi_map.go
@@ -69,20 +69,20 @@ func (m *ICefStringMultiMap) GetEnumerate(key string, index uint32) (r string) {
 }
 
 // GetKey 根据 index 获取key
-func (m *ICefStringMultiMap) GetKey(index uint32) (r string) {
-	value := NewTString()
-	imports.Proc(def.StringMultimap_GetKey).Call(m.Instance(), uintptr(index), value.Instance())
-	r = value.Value()
-	value.Free()
-	return r
+func (m *ICefStringMultiMap) GetKey(index uint32) (key string) {
+	tKey := NewTString()
+	imports.Proc(def.StringMultimap_GetKey).Call(m.Instance(), uintptr(index), tKey.Instance())
+	key = tKey.Value()
+	tKey.Free()
+	return
 }
 
 // GetValue 根据 index 获取value
-func (m *ICefStringMultiMap) GetValue(index uint32) (r string) {
-	value := NewTString()
-	imports.Proc(def.StringMultimap_GetValue).Call(m.Instance(), uintptr(index), value.Instance())
-	r = value.Value()
-	value.Free()
+func (m *ICefStringMultiMap) GetValue(index uint32) (value string) {
+	tValue := NewTString()
+	imports.Proc(def.StringMultimap_GetValue).Call(m.Instance(), uintptr(index), tValue.Instance())
+	value = tValue.Value()
+	tValue.Free()
 	return
 }