BriskBard, CEF4Delphi, WebView4Delphi, WebUI4Delphi and WebUI4CSharp

procedure TBrowserFrame.WVBrowser1WebResourceRequested(Sender: TObject;
const aWebView: ICoreWebView2;
const aArgs: ICoreWebView2WebResourceRequestedEventArgs);
var
TempArgs : TCoreWebView2WebResourceRequestedEventArgs;
RequestHeaders:ICoreWebView2HttpRequestHeaders;
begin
TempArgs:= TCoreWebView2WebResourceRequestedEventArgs.Create(aArgs);
try
TempArgs.Request.Get_Headers(RequestHeaders);
RequestHeaders.SetHeader('Accept-Language','zh-cn;q=0.8,en-US;q=0.9');

finally
TempArgs.Free ;
end;
end;

No response.

Hi,

WebView4Delphi is just a WebView2 wrapper.

If setting a new header is not working you should contact Microsoft at the WebView2 feedback repository and report the issue :
https://github.com/MicrosoftEdge/WebView2Feedback/issues

It should be possible to set the language and the accept-languages header with TWVBrowserBase.Language before creating the browser.
You can also set GlobalWebView2Loader.Language before the GlobalWebView2Loader.StartWebView2 call.

So does this mean that custom headers cannot be changed?

The documentation states that the headers are mutable at that event but it wouldn't be the first time I see that Chromium or Edge don't allow us to modify some of them.

procedure TMainForm.WVBrowser1AfterCreated(Sender: TObject);

WVBrowser1.AddWebResourceRequestedFilter('*', COREWEBVIEW2_WEB_RESOURCE_CONTEXT_ALL);
WVBrowser1.AddWebResourceRequestedFilterWithRequestSourceKinds('*',COREWEBVIEW2_WEB_RESOURCE_CONTEXT_IMAGE, COREWEBVIEW2_WEB_RESOURCE_REQUEST_SOURCE_KINDS_ALL);
WVBrowser1.AddWebResourceRequestedFilterWithRequestSourceKinds('*',COREWEBVIEW2_WEB_RESOURCE_CONTEXT_MEDIA,COREWEBVIEW2_WEB_RESOURCE_REQUEST_SOURCE_KINDS_ALL);

It is solved by putting