(Objective-C) 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"
      }
    ]
  }
}

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#import <CkoHttpRequest.h>
#import <CkoJsonObject.h>
#import <CkoJsonArray.h>
#import <NSString.h>

// This example demonstrates building an application/json request.

CkoHttpRequest *req = [[CkoHttpRequest alloc] init];

// 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.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json AppendString: @"username" value: @"my_username"];
[json AppendString: @"password" value: @"my_password"];
CkoJsonObject *vFactors = [json AppendObject: @"validation-factors"];
CkoJsonArray *vArray = [vFactors AppendArray: @"validationFactors"];
[vArray AddObjectAt: [NSNumber numberWithInt: 0]];
CkoJsonObject *factorObj = [vArray ObjectAt: [NSNumber numberWithInt: 0]];
[factorObj AppendString: @"name" value: @"remote_address"];
[factorObj AppendString: @"value" value: @"127.0.0.1"];

// 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 = NO;
[req LoadBodyFromString: [json Emit] charset: @"utf-8"];

// View the request that would be sent if SynchronousRequest was called:
NSString *requestMime = [req GenerateRequestText];
NSLog(@"%@",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