HttpListener in WinUI app doesn't catch params in link

Question

Hi! I try to get authorization code for Microsoft, using authorization via browser. I use HttpListener for catching redirect with code, but it's catch only redirect without parameters. In browser I saw redirect with code.

My code:

private string localhostCodeKey = "{0}/#code";
public const string RedirectScript = "";

NameValueCollection queryParams;    
string code = string.Empty; 
if (args.RedirectUri.Contains("localhost"))
{
    codeKey = string.Format(localhostCodeKey, args.RedirectUri);
}   
else    
{   
    codeKey = string.Format(codeKey, args.RedirectUri);   
}    
string scope = AuthUtilities.FormatMicrosoftScope(args.ScopeType, args.CustomScopes);
scope = HttpUtility.UrlEncode(scope);

string signInUri = $"{Constants.MsAuthUri}" +
                   $"?client_id={args.ClientId}" +
                    "&response_type=code" +
                   $"&redirect_uri={args.RedirectUri}" +
                    "&response_mode=fragment" +
                   $"&scope={scope}";

if (httpListener.IsListening)
{
  httpListener?.Stop();
}
httpListener = new HttpListener();
httpListener.Prefixes.Add(args.RedirectUri + "/");
httpListener.Start();

Launcher.LaunchUriAsync(new Uri(signInUri));

var context = await httpListener.GetContextAsync();
var codeResponse = context.Response;
var buffer = Encoding.UTF8.GetBytes(Constants.RedirectScript);
codeResponse.ContentLength64 = buffer.Length;
var responseOutput = codeResponse.OutputStream;
Task responseTask = responseOutput.WriteAsync(buffer, 0, buffer.Length).ContinueWith((task) =>
{
responseOutput.Close();
httpListener.Stop();
});

queryParams = HttpUtility.ParseQueryString(context.Request.Url.AbsoluteUri);

code = queryParams[codeKey];```

`context.Request.Url.AbsoluteUri` contains only redirect uri. Similar code works fine with Google auth, I don't know what I am doing wrong.

Accepted Answer

It is probably a form post rather than a get. You will need to parse the body.

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HttpListener in WinUI app doesn't catch params in link

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