(SQL Server) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example assumes Chilkat HTTP to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @success int

    DECLARE @http int
    -- Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    DECLARE @req int
    -- Use "Chilkat_9_5_0.HttpRequest" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.HttpRequest', @req OUT

    EXEC sp_OASetProperty @req, 'HttpVerb', 'POST'
    EXEC sp_OASetProperty @req, 'ContentType', 'text/xml'
    EXEC sp_OASetProperty @req, 'SendCharset', 1
    EXEC sp_OASetProperty @req, 'Charset', 'utf-8'
    EXEC sp_OASetProperty @req, 'Path', '/webtax2/wsgsis/RgWsPublic/RgWsPublicPort?WSDL'

    DECLARE @xmlRequest nvarchar(4000)
    SELECT @xmlRequest = '...SOAP envelope...'
    EXEC sp_OAMethod @req, 'LoadBodyFromString', @success OUT, @xmlRequest

    EXEC sp_OASetProperty @http, 'FollowRedirects', 1

    -- 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.
    DECLARE @resp int
    EXEC sp_OAMethod @http, 'SynchronousRequest', @resp OUT, 'www3.gsis.gr', 443, 1, @req
    EXEC sp_OAGetProperty @http, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @req
        RETURN
      END

    DECLARE @xmlResponse nvarchar(4000)
    EXEC sp_OAGetProperty @resp, 'BodyStr', @xmlResponse OUT

    PRINT @xmlResponse

    EXEC @hr = sp_OADestroy @resp


    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @req


END
GO