(Swift) POST JSON to REST API with non-us-ascii Chars Escaped

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Note: This example requires Chilkat v11.1.0 or greater.

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func chilkatTest() {
    var success: Bool = false

    success = false

    let rest = CkoRest()!

    // Connect using TLS.
    var bAutoReconnect: Bool = true
    success = rest.connect("chilkatsoft.com", port: 443, tls: true, autoReconnect: bAutoReconnect)

    // Load JSON containing the following Korean text.

    //  {
    //    "BillAddr": {
    //       "Id": "239615",
    //       "Line1": "류리하",
    //       "Line2": "류리하류리하",
    //       "City": "류리하류리하",
    //       "Country": "US",
    //       "CountrySubDivisionCode": "AK",
    //       "PostalCode": "류리하"
    //     }
    // }

    let json = CkoJsonObject()!
    json.emitCompact = false
    success = json.loadFile("qa_data/json/korean.json")
    if success == false {
        print("\(json.lastErrorText!)")
        return
    }

    success = rest.addHeader("Content-Type", value: "application/json; charset=UTF-8")

    let sb = CkoStringBuilder()!
    json.emitSb(sb)
    sb.encode("unicodeescape", charset: "utf-8")

    print("\(sb.getAsString()!)")

    // The StringBuilder contains this:

    // {
    //   "BillAddr": {
    //     "Id": "239615",
    //     "Line1": "\ub958\ub9ac\ud558",
    //     "Line2": "\ub958\ub9ac\ud558\ub958\ub9ac\ud558",
    //     "City": "\ub958\ub9ac\ud558\ub958\ub9ac\ud558",
    //     "Country": "US",
    //     "CountrySubDivisionCode": "AK",
    //     "PostalCode": "\ub958\ub9ac\ud558"
    //   }
    // }

    let sbResp = CkoStringBuilder()!
    success = rest.fullRequestSb("POST", uriPath: "/echo_request_body.asp", requestBody: sb, responseBody: sbResp)
    if success == false {
        print("\(rest.lastErrorText!)")
        return
    }

    // Show the response. 
    print("Json Response: \(sbResp.getAsString()!)")

}