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

Demonstrates how to construct and send a multipart/form-data HTTP POST.

For more information, see https://chilkatsoft.com/http_multipart_form_data_post.asp

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    // Sends the following multipart/form-data POST:

    // POST /xyz/something HTTP/1.1
    // Host: domain
    // Content-Type: multipart/form-data; boundary=------------090708030009010000030901
    // Content-Length: 2220
    // 
    // --------------090708030009010000030901
    // Content-Disposition: form-data; name="param1"
    // 
    // value1
    // --------------090708030009010000030901
    // Content-Disposition: form-data; name="param2"
    // 
    // value2
    // --------------090708030009010000030901
    // Content-Disposition: form-data; name="starfish20"; filename="starfish20.jpg"
    // Content-Type: image/jpeg
    // 
    // JPEG DATA HERE...
    // --------------090708030009010000030901
    // Content-Disposition: form-data; name="helloWorld"; filename="helloWorld.pdf"
    // Content-Type: application/pdf
    // 
    // PDF DATA HERE...
    // --------------090708030009010000030901
    // Content-Disposition: form-data; name="tinyA"; filename="tinyA.xml"
    // Content-Type: text/xml
    // 
    // XML DATA HERE...
    // --------------090708030009010000030901--
    // 

    let req = CkoHttpRequest()!
    req.httpVerb = "POST"
    req.contentType = "multipart/form-data"
    req.path = "/xyz/something"

    req.addParam("param1", value: "value1")
    req.addParam("param2", value: "value2")

    // Add some small files to the request. (Small so we can see what the full request looks like without too much data..)
    let bd = CkoBinData()!
    var success: Bool = bd.loadFile("qa_data/jpg/starfish20.jpg")
    req.addBd(forUpload: "starfish20", remoteFilename: "starfish20.jpg", byteData: bd, contentType: "image/jpeg")

    success = bd.loadFile("qa_data/pdf/helloWorld.pdf")
    req.addBd(forUpload: "helloWorld", remoteFilename: "helloWorld.pdf", byteData: bd, contentType: "application/pdf")

    success = bd.loadFile("qa_data/xml/tinyA.xml")
    req.addBd(forUpload: "tinyA", remoteFilename: "tinyA.xml", byteData: bd, contentType: "text/xml")

    let http = CkoHttp()!

    var resp: CkoHttpResponse? = http.synchronousRequest("example.com", port: 443, ssl: true, req: req)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    print("HTTP response status: \(resp!.statusCode.intValue)")

    print("Received:")
    print("\(resp!.bodyStr!)")

    resp = nil

}