(VB.NET) Duplicate TLS 1.2 SOAP Request that uses .NET HttpWebRequest

This example shows how to duplicate a SOAP request that uses .NET's HttpWebRequest and requires TLS 1.2.

        string xmlRequest = "...envelope..."

        System.Net.ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;

        string url = "https://www3.gsis.gr/webtax2/wsgsis/RgWsPublic/RgWsPublicPort?WSDL";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        req.ContentType = "text/xml;charset=UTF-8";

        byte[] reqBytes = new System.Text.UTF8Encoding().GetBytes(xmlRequest);

        req.ContentLength = reqBytes.Length;

        try {
            using (System.IO.Stream reqStream = req.GetRequestStream()) {
                reqStream.Write(reqBytes, 0, reqBytes.Length);
                reqStream.Flush();
                reqStream.Close();
            }

        } catch (Exception ex) {
            actionLogger.AddError(ex.Message, null);
            actionLogger.Validate();
        }

        string xmlResponse = null;
        using (HttpWebResponse resp = (HttpWebResponse)req.GetResponse()) {
            try {
                using (System.IO.StreamReader sr = new System.IO.StreamReader(resp.GetResponseStream())) {
                    xmlResponse = sr.ReadToEnd();
                    sr.Close();
                }
            } catch (Exception ex) {
                actionLogger.AddError(ex.Message, null);
                actionLogger.Validate();
            } finally {
                resp.Close();
            }
        }

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example assumes Chilkat HTTP to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim success As Boolean
Dim http As New Chilkat.Http

Dim req As New Chilkat.HttpRequest
req.HttpVerb = "POST"
req.ContentType = "text/xml"
req.SendCharset = True
req.Charset = "utf-8"
req.Path = "/webtax2/wsgsis/RgWsPublic/RgWsPublicPort?WSDL"

Dim xmlRequest As String = "...SOAP envelope..."
req.LoadBodyFromString(xmlRequest)

http.FollowRedirects = True

' Chilkat will automatically offer TLS 1.2.  It is the server that
' chooses the TLS protocol version.  Assuming the server wishes to use
' TLS 1.2, then that is what will be used.
Dim resp As Chilkat.HttpResponse = http.SynchronousRequest("www3.gsis.gr",443,True,req)
If (http.LastMethodSuccess <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim xmlResponse As String = resp.BodyStr
Debug.WriteLine(xmlResponse)