(Swift 2) Send HTTP POST using non-UTF8 such as Windows-1250

Demonstrates how to specify the character encoding (charset) to be used for the body of an HTTP POST.

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

    let http = CkoHttp()

    let req = CkoHttpRequest()

    // Load a JSON file containing strings with Polish chars.
    let json = CkoJsonObject()
    var success: Bool = json.LoadFile("qa_data/json/has_polish_chars.json")
    if success == false {
        print("\(json.LastErrorText)")
        return
    }

    // Add the request params expected by the server-side:
    req.AddParam("tytul", value: json.StringOf("tytul"))
    req.AddParam("tresc", value: json.StringOf("tresc"))

    // Indicate we wish to explicitly send the charset attribute in the HTTP request header.
    req.SendCharset = true

    // Send the POST
    // You can send the POST to the URL below.  It will respond with the request body in quoted-printable format.
    // Using quoted-printable, we can easily see the binary bytes for the accented chars.
    var resp: CkoHttpResponse?
    resp = http.PostUrlEncoded("https://www.chilkatsoft.com/echoPost.cshtml", req: req)
    if http.LastMethodSuccess != true {
        print("\(http.LastErrorText)")
        return
    }

    print("\(http.LastHeader)")
    print("\(resp!.BodyStr)")

    // Sample output:

    // --------------------------------------------------
    // POST /echoPost.cshtml HTTP/1.1
    // Host: www.chilkatsoft.com
    // Content-Type: application/x-www-form-urlencoded; charset=utf-8
    // Content-Length: 79
    // 
    // <pre>tytul=3DPrzyk%C5%82ad&amp;tresc=3DPrzyk%C5%82ad
    // %82oszenie</pre>
    // --------------------------------------------------

    // We can see by the %C5%82 that utf-8 was sent, because %C5%82 is the 2-byte representation of a particular Polish char.

    resp = nil

    // -----------------------
    // However.. we can change the charset used for the HTTP request by specifying the request object's charset.

    req.SendCharset = true
    req.Charset = "windows-1250"

    resp = http.PostUrlEncoded("https://www.chilkatsoft.com/echoPost.cshtml", req: req)
    if http.LastMethodSuccess != true {
        print("\(http.LastErrorText)")
        return
    }

    print("\(http.LastHeader)")
    print("\(resp!.BodyStr)")

    // Sample output...
    // You can see how the bytes used for the Polish chars are now 1-byte per char (i.e. using Windows-1250) 

    // --------------------------------------------------
    // POST /echoPost.cshtml HTTP/1.1
    // Host: www.chilkatsoft.com
    // Content-Type: application/x-www-form-urlencoded; charset=windows-1250
    // Content-Length: 70
    // 
    // <pre>tytul=3DPrzyk%B3ad&amp;tresc=3DPrzyk%B3ad
    // e</pre>
    // --------------------------------------------------

    resp = nil

}