ConnectAsync will block forever if there's an invalid extra header

[fstanis]

I just came across an interesting issue, I had a bug in my code that generated an invalid value for the Authorization header. This caused a very hard-to-debug issue where ConnectAsync would just block forever. Here's a minimum repro:

var client = new SocketIOClient.SocketIO("http://localhost:8080/", new SocketIOOptions
{
    ExtraHeaders = new()
    {
        { "Authorization", ":" }
    }
});
await client.ConnectAsync();

Edit: this sounds a lot like #300 however I'm using .NET 9.0