I can't change the Webview 4 header. Please fix it.

[sodlf159]

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.

[salvadordf]

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.

[sodlf159]

So does this mean that custom headers cannot be changed?

[salvadordf]

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.

[sodlf159]

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