(Swift 3,4,5...) 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 Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes Chilkat HTTP to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success: Bool
    let http = CkoHttp()!

    let req = CkoHttpRequest()!
    req.httpVerb = "POST"
    req.contentType = "text/xml"
    req.sendCharset = true
    req.charset = "utf-8"
    req.path = "/webtax2/wsgsis/RgWsPublic/RgWsPublicPort?WSDL"

    var xmlRequest: String? = "...SOAP envelope..."
    req.loadBody(from: 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.
    var resp: CkoHttpResponse? = http.synchronousRequest("www3.gsis.gr", port: 443, ssl: true, req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    var xmlResponse: String? = resp!.bodyStr
    print("\(xmlResponse!)")

    resp = nil

}