(Swift) SharePoint -- Update the Contents of a File (PUT)

Demonstrates how to update the contents of a SharePoint file.

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

    let http = CkoHttp()

    //  If SharePoint Windows classic authentication is used, then set the
    //  Login, Password, LoginDomain, and NtlmAuth properties.
    http.Login = "SHAREPOINT_USERNAME"
    http.Password = "SHAREPOINT_PASSWORD"
    http.LoginDomain = "SHAREPOINT_NTLM_DOMAIN"
    http.NtlmAuth = true

    //  The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
    //  If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
    //  establish the cookie as shown at SharePoint Online Authentication

    //  Indicate that we want a JSON reply
    http.Accept = "application/json;odata=verbose"

    //  Update /Documents/ChilkatTest/sample.docx with new content...
    let req = CkoHttpRequest()
    req.HttpVerb = "POST"
    req.Path = "/_api/web/GetFileByServerRelativeUrl('/Documents/ChilkatTest/sample.docx')/$value"
    //  Give the location of the file to be uploaded.
    //  Note: The file is not loaded into memory at this point.  It is never fully loaded
    //  into memory.  Instead, the file data is streamed directly from the file when
    //  when the upload occurs.
    req.StreamBodyFromFile("qa_data/msword/sample.docx")

    //  We need to add a form digest value in the X-RequestDigest header field.
    //  See this example for details on
    //  how to get (and cache) a form digest value
    req.AddHeader("X-RequestDigest", value: "SHAREPOINT_FORM_DIGEST")

    //  Also need to add this header..
    req.AddHeader("X-HTTP-Method", value: "PUT")

    //  Upload..
    var bUseTls: Bool = true
    var resp: CkoHttpResponse? = http.SynchronousRequest("SHAREPOINT_HTTPS_DOMAIN", port: 443, ssl: bUseTls, req: req)
    if http.LastMethodSuccess != true {
        print("\(http.LastErrorText)")
        return
    }

    //  A successful update will return a 204 status code with an empty body.
    //  A non-successful update will return a JSON response body..
    if resp!.StatusCode.intValue != 204 {
        print("Response status code = \(resp!.StatusCode.intValue)")
        let json = CkoJsonObject()
        json.Load(resp!.BodyStr)
        json.EmitCompact = false
        print("\(json.Emit())")
        print("Failed")
        resp = nil
        return
    }

    resp = nil

    print("Success.")

}