(Swift 3,4,5...) HTTP multipart/form-data Upload

Demonstrates how to upload files to an HTTP server using a multipart/form-data 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()!
    req.httpVerb = "POST"
    req.contentType = "multipart/form-data"
    req.path = "rcvFormDataUpload.aspx"

    // Send an "Expect: 100-continue" header in the request.
    // This causes the HTTP server to end a 100-continue response
    // immediately after receiving the HTTP header.  The client
    // (Chilkat) will receive this intermediate response, and if
    // it's not an error response, it knows that the HTTP server will
    // accept the data that is forthcoming.
    // The alternative is to get an error response after trying to upload
    // the entire contents of the files.
    req.addHeader("Expect", value: "100-continue")

    // Call AddFileForUpload2 for each file to be uploaded in the HTTP multipart/form-data POST
    // To allow Chilkat to determine the content-type automatically based on file-extension,
    // call AddFileForUpload instead.

    // The 1st arg is the filename passed in the HTTP request.
    // The 2nd arg is the path in the local filesytem.
    // The file is not loaded into memory.  It is streamed directly from the file
    // when the HTTP POST is sent.
    var success: Bool = req.addFile(forUpload2: "starfish.jpg", path: "c:/qa_data/starfish.jpg", contentType: "image/jpg")
    if success != true {
        print("\(req.lastErrorText!)")
        return
    }

    success = req.addFile(forUpload: "something.pdf", path: "c:/qa_data/something.pdf")
    if success != true {
        print("\(req.lastErrorText!)")
        return
    }

    // Its also possible to add a file from a string:
    success = req.addString(forUpload: "test.xml", filename: "test.xml", strData: "<abc>This is the test.xml content</abc>", charset: "utf-8")
    // We'll assume success since no files are involved..

    // This sends the HTTP request (with 3 files being uploaded) to
    // http://www.mywebserver123abc.com/rcvFormDataUpload.aspx
    var resp: CkoHttpResponse?
    resp = http.synchronousRequest("www.mywebserver123abc.com", port: 80, ssl: false, req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
    }
    else {
        print("HTTP response status: \(resp!.statusCode.intValue)")
        // See the online reference documentation for 
        // other information that can be obtained from the response object.
        resp = nil
    }

    // To send using SSL/TLS, do this instead.
    // This sends to https://www.mywebserver123abc.com/rcvFormDataUpload.aspx
    resp = http.synchronousRequest("www.mywebserver123abc.com", port: 443, ssl: true, req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
    }
    else {
        print("HTTP response status: \(resp!.statusCode.intValue)")
        // See the online reference documentation for 
        // other information that can be obtained from the response object.
        resp = nil
    }


}