(Swift 3,4,5...) Send XMLHttpRequest and Get Response

Demonstrates how to send an HTTP XML request and retrieve the response.

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

    let http = CkoHttp()!

    // The XML sent in the body of the request is application
    // specified -- it should contain whatever the server-side
    // application is expecting..
    var xmlStr: String? = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><appXml><something>123</something></appXml>"

    // The PostXml method may be called to send the XMLHttpRequest
    // using the "POST" HTTP method (also known as "verb").
    var urlEndpoint: String? = "http://www.chilkatsoft.com/xmlEcho.asp"
    var xmlCharset: String? = "utf-8"

    var resp: CkoHttpResponse?
    resp = http.postXml(urlEndpoint, xmlDoc: xmlStr, charset: xmlCharset)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    // The raw HTTP request sent by the above call is:

    // POST /xmlEcho.asp HTTP/1.1
    // Content-Type: text/xml
    // Host: www.chilkatsoft.com
    // Accept: */*
    // Accept-Charset: ISO-8859-1,utf-8;q=0.7,*; q=0.7
    // Accept-Language: en-us,en;q=0.5
    // Accept-Encoding: gzip
    // Content-Length: 81
    // 
    // <?xml version="1.0" encoding="UTF-8"?><appXml><something>123</something></appXml>

    // Examine the Body of the HTTP response
    // This would be the XML response sent by the server.
    print("\(resp!.bodyStr!)")

    resp = nil

}