c#post tcp httpclient servicepointmanager

c# httpclient post force single packet

Using Microsoft Message Analyzer, I can see that post data using the HttpClient is being sent in two tcp packets. One for the header, then one for the post data. This data could easily fit into one packet, however it is being split into two. I have explicitly turned on nagling and expect 100 continue off using the ServicePointManager, though, it doesn't seem to help.

        ServicePointManager.Expect100Continue = false;
        ServicePointManager.UseNagleAlgorithm = true;

5023 (.Net) shows 2 packets are sent to destination, 8170 (Postman) shows 1 packet being sent. Tests were done with the same payload.

Below is some sample code used to generate the request in .net

    public void TestRequest()
    {
        var uri = new Uri("http://www.webscantest.com/");
        ServicePointManager.Expect100Continue = false;
        ServicePointManager.UseNagleAlgorithm = true;
        var p = ServicePointManager.FindServicePoint(uri);
        p.Expect100Continue = false;
        p.UseNagleAlgorithm = true;
        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Add("Connection", "close");

        var values = new Dictionary<string, string>
        {
            { "thing1", "hello" },
            { "thing2", "world" }
        };

        var content = new FormUrlEncodedContent(values);

        var response = client.PostAsync("http://www.webscantest.com/", content, CancellationToken.None).Result;
    }

Is there a way to force the payload into a single packet?

Using .Net Framework 4.7