(Swift) curl POST with JSON Input and JSON Output

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Note: This example requires Chilkat v11.5.0 or greater.

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func chilkatTest() {
    var success: Bool = false

    // Run the following curl command

    //  curl -X POST https://httpbin.org/post \
    //       -H "Content-Type: application/json" \
    //       -d '{
    //             "title": "foo",
    //             "body": "bar",
    //             "userId": 1
    //           }'

    // The backslashes at the end of lines are not required.  Chilkat ignores them if present.
    let sbTargetCurl = CkoStringBuilder()!
    sbTargetCurl.appendLn(" curl -X POST https://httpbin.org/post \\")
    sbTargetCurl.appendLn("      -H \"Content-Type: application/json\" \\")
    sbTargetCurl.appendLn("      -d '{")
    sbTargetCurl.appendLn("            \"title\": \"foo\",")
    sbTargetCurl.appendLn("            \"body\": \"bar\",")
    sbTargetCurl.appendLn("            \"userId\": 1")
    sbTargetCurl.appendLn("          }'")

    let httpCurl = CkoHttpCurl()!

    // Run the curl command.
    success = httpCurl.doYourThing(sbTargetCurl.getAsString())
    if success == false {
        print("\(httpCurl.lastErrorText!)")
        return
    }

    let responseJson = CkoJsonObject()!
    responseJson.emitCompact = false

    httpCurl.getResponseJson(responseJson)

    var statusCode: Int = httpCurl.statusCode.intValue
    print("response status code: \(statusCode)")

    print("\(responseJson.emit()!)")

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": "{\r\n            \"title\": \"foo\",\r\n            \"body\": \"bar\",\r\n            \"userId\": 1\r\n          }",
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "Content-Length": "96",
    //     "Content-Type": "application/json",
    //     "Host": "httpbin.org",
    //     "X-Amzn-Trace-Id": "Root=1-69e8db8b-459b3bdf7b7a3bc749184968"
    //   },
    //   "json": {
    //     "body": "bar",
    //     "title": "foo",
    //     "userId": 1
    //   },
    //   "origin": "123.222.222.222",
    //   "url": "https://httpbin.org/post"
    // }

    // ----------------------------------------------------------------------------------
    // Another example:

    // curl -X POST https://postman-echo.com/post \
    //      -H "Content-Type: application/json" \
    //      -d '{"foo":"bar"}'

    var targetCurl: String? = "curl -X POST https://postman-echo.com/post -H \"Content-Type: application/json\" -d '{\"foo\":\"bar\"}'"

    // Run the curl command.
    success = httpCurl.doYourThing(targetCurl)
    if success == false {
        print("\(httpCurl.lastErrorText!)")
        return
    }

    httpCurl.getResponseJson(responseJson)

    statusCode = httpCurl.statusCode.intValue
    print("response status code: \(statusCode)")

    print("\(responseJson.emit()!)")

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": {
    //     "foo": "bar"
    //   },
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "host": "postman-echo.com",
    //     "content-length": "13",
    //     "content-type": "application/json",
    //     "x-forwarded-proto": "https",
    //     "accept-encoding": "gzip, br"
    //   },
    //   "json": {
    //     "foo": "bar"
    //   },
    //   "url": "https://postman-echo.com/post"
    // }

}