BasicAuthenticationRequired event removes Content-Type header from Request.

[rpriest1260]

Discussed in #4841

^{Originally posted by rpriest1260 September 30, 2024}
Hello,

I am seeing an issue and wondering if this is a bug in the WebView2 code. Essentially, after the BasicAuthenticationRequested event fires and the credentials are supplied, the WebView2 code appears to remove the Content-Type header (if supplied), from the initial POST request sent. The webservice I intend to use needs that header, so this breaks the request. Should I file a bug for it? Has anyone else run into this?

Just to check I created the same POST request with a HttpWebRequest, object, and that does not have this problem - it does not strip the Content-Type header after the 407-Proxy Auth Required has been satisfied with the supplied credentials.

I am using:

• .NET 4.7.2
• WebView2 1.0.2792.45
• Proxy Server - with Proxy Authentication Required (I am testing with Fiddler Classic).
• A web service that accepts a POST request

My POST request is done as follows:

 var postDataStream =  new MemoryStream (Encoding.UTF8.GetBytes (PostData ?? ""));;
 var request = webView.CoreWebView2.Environment.CreateWebResourceRequest(TargetUrl,
   "POST", postDataStream, "Content-Type: application/x-www-form-urlencoded");
 webView.CoreWebView2.NavigateWithWebResourceRequest(request);

And my credentials are supplied using the BasicAuthenticationRequired even, like so

webView.CoreWebView2.BasicAuthenticationRequested += (s, args) =>
    {
        //var creds = new {UserName="1", Password="1"};
        var creds = (webProxy == null || string.IsNullOrEmpty(webProxy?.Address.ToString())) ? null : webProxy?.Credentials as NetworkCredential;
        if (creds != null)
        {
            s_logger.Debug($"Setting proxy creds. User = {creds.UserName}");
            args.Response.UserName = creds.UserName;
            args.Response.Password = creds.Password;
        }
    };

And as mentioned, above, A basic HttpWebRequest, does not have this issue. If you would like to see what code I used to compare to WebView2, it looks like this:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);            
WebProxy myProxy = new WebProxy();
// Associate the newUri object to 'myProxy' object so that new myProxy settings can be set.
myProxy.Address = new Uri("http://localhost:9191");
// Create a NetworkCredential object and associate it with the 
// Proxy property of request object.
myProxy.Credentials = new NetworkCredential("1", "1");            
request.Proxy = myProxy;

request.Method = "POST";
ASCIIEncoding encoding = new ASCIIEncoding();
request.ContentType = "application/x-www-form-urlencoded";
byte[] data = encoding.GetBytes("data1=postdatastring_fff");
request.ContentLength = data.Length;
Stream newStream = request.GetRequestStream(); //open connection
newStream.Write(data, 0, data.Length); // Send the data.
newStream.Close();
string text;
var response = (HttpWebResponse)request.GetResponse();

if any other information or sample code is needed, please just ask and I will supply.

Thank you in advance.