Accept header is overwritten and cannot be set

[DonetCracker]

After calling the LoadRequest method, the Accept header is overwritten and cannot be set.

I overrode the LoadUrlWithPostData method through IFrame.LoadRequest(IRequest). ACCEPT header was added to IRequeset.Headers, but were eventually overwritten. And I don't want to set it up in the OnBeforeResourceLoad method, although it's an effective way.

private static void LoadUrl(ChromiumWebBrowser browser, string url, byte[] postDataBytes, string requestMethod = "POST", WebHeaderCollection headers = null)
        {
            using (var frame = browser.GetMainFrame())
            {
                ThrowExceptionIfFrameNull(frame);


                var initializePostData = requestMethod.ToLower() == "post";

                var request = frame.CreateRequest(initializePostData: initializePostData);
                if (initializePostData)
                {
                    request.InitializePostData();
                    request.PostData.AddData(postDataBytes);
                }

                request.Url = url;
                request.Method = requestMethod;

                if (headers != null && headers.HasKeys())
                {
                    var originHeader = request.Headers ?? new NameValueCollection();

                    foreach (string keyName in headers.AllKeys)
                    {
                        originHeader.Set(keyName, headers[keyName]);
                    }

                    var refererValue = headers[HttpRequestHeader.Referer];

                    // Set Referer
                    if (!string.IsNullOrEmpty(refererValue))
                    {
                        request.SetReferrer(refererValue, ReferrerPolicy.Default);
                    }


                    request.Headers = originHeader;
                }


                frame.LoadRequest(request);
            }
        }

        public static void LoadUrlWithPostDataLocal(this ChromiumWebBrowser browser, string url, byte[] postDataBytes, WebHeaderCollection headers = null)
        {
            LoadUrl(browser, url, postDataBytes, "POST", headers);
        }

Here is my example:

var postdata = "mact=1&search_flag=1&page=1&search_text=";
var buffer = Encoding.UTF8.GetBytes(postdata);
var cookies = "";
var headers = new WebHeaderCollection
{
        {"Accept","application/json, text/javascript, */*; q=0.01" },
        {HttpRequestHeader.Cookie,cookies }
};
//  Accept header will be rewritten  
browser.LoadUrlWithPostDataLocal(url, buffer, header);

Does anyone help me?

[support]

👋 @DonetCracker, we use the issue tracker exclusively for bug reports and feature requests. However, this issue appears to be a support request. Please use our support channels to get help with the project.
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[amaitland]

For reference LoadUrlWithPostData has been marked as Obsolete and will be removed (#2705)

LoadRequest bypasses the normal navigation pipeline

https://magpcss.org/ceforum/viewtopic.php?f=6&t=16592&p=41067#p41074

There are many problems with LoadRequest in 71.0.x, these are CEF issues.

And I don't want to set it up in the OnBeforeResourceLoad method, although it's an effective way.

That is the only reliably way. LoadRequest is just unreliable now, it worked in older versions.

[amaitland]

More specifically it looks like your issue is https://magpcss.org/ceforum/viewtopic.php?f=6&t=16561&p=40960.

Closing as upstream.

[DonetCracker]

More specifically it looks like your issue is https://magpcss.org/ceforum/viewtopic.php?f=6&t=16561&p=40960.

Closing as upstream.

Thank you very much, you save my life!!