(Swift 3,4,5...) Creating an application/json HTTP POST Request

Demonstrates how to create an HTTP POST request having the Content-Type application/json, where the body of the HTTP request is the following JSON:

{
   "username" : "my_username",
   "password" : "my_password",
   "validation-factors" : {
      "validationFactors" : [
         {
            "name" : "remote_address",
            "value" : "127.0.0.1"
         }
      ]
   }
}

The generated HTTP request looks like this:

POST /something HTTP/1.1
Content-Type: application/json
Accept: application/json
Host: domain
Content-Length: 216

{
  "username": "my_username",
  "password": "my_password",
  "validation-factors": {
    "validationFactors": [
      {
        "name": "remote_address",
        "value": "127.0.0.1"
      }
    ]
  }
}

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

func chilkatTest() {
    // This example demonstrates building an application/json request.

    let req = CkoHttpRequest()!

    // The ContentType, HttpVerb, and Path properties should
    // always be explicitly set.
    req.httpVerb = "POST"
    req.path = "/something"
    req.contentType = "application/json"

    // We may wish to add an "Accept" header to the request.
    // This tells the server we'll accept an application/json response.
    req.addHeader("Accept", value: "application/json")

    // We'll use Chilkat's JSON API to create the JSON body of the HTTP request.
    let json = CkoJsonObject()!
    json.append("username", value: "my_username")
    json.append("password", value: "my_password")
    var vFactors: CkoJsonObject? = json.append("validation-factors")
    var vArray: CkoJsonArray? = vFactors!.appendArray("validationFactors")
    vArray!.addObject(at: 0)
    var factorObj: CkoJsonObject? = vArray!.object(at: 0)
    factorObj!.append("name", value: "remote_address")
    factorObj!.append("value", value: "127.0.0.1")
    factorObj = nil
    vArray = nil
    vFactors = nil

    // Use the JSON for the HTTP request body
    // By default, the Emit method will output compact JSON.
    // This is best for generating the smallest size request.
    // To generate a more human-readable (pretty-printed) JSON request body,
    // set the EmitCompact property to FALSE
    json.emitCompact = false
    req.loadBody(from: json.emit(), charset: "utf-8")

    // View the request that would be sent if SynchronousRequest was called:
    var requestMime: String? = req.generateText()
    print("\(requestMime!)")

    // A few important comments about the HTTP request that is generated:
    // 
    // 1) The Content-Length header is automatically generated based on the actual length of the MIME message
    //    that follows the intial (topmost) MIME header.
    // 2) The HOST header will automatically get filled in with the actual domain when SynchronousRequest
    //    is called

}