AFJSONParameterEncoding in AFNetworking 2.x.x - ios

Question

I am implementing following paypal REST API:
curl -v https://api.sandbox.paypal.com/v1/vault/credit-card \
-H 'Content-Type:application/json' \
-H 'Authorization: Bearer {accessToken}' \
-d '{
"payer_id":"user12345",
"type":"visa",
"number":"4417119669820331",
"expire_month":"11",
"expire_year":"2018",
"first_name":"Joe",
"last_name":"Shopper"
}'
I have successfully implement this api in AFNetworking 1.3.3 with following Code. Where PPWebService is subclass of AFHTTPClient
[[PPWebService sharedClient] setParameterEncoding:AFJSONParameterEncoding];
[[PPWebService sharedClient] setDefaultHeader:#"Content-Type" value:#"application/json"];
[[PPWebService sharedClient] setDefaultHeader:#"Authorization" value:[NSString stringWithFormat:#"Bearer %#", accessToken]];
[[PPWebService sharedClient] postPath:#"vault/credit-card"
parameters:creditCard
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSDictionary *response = [self JSONToObject:operation.responseString];
creditCardId = response[#"id"];
if(creditCardId)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Credit card" message:#"Saved !!" delegate:nil cancelButtonTitle:#"on" otherButtonTitles:nil];
[alert show];
}
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Credit card" message:error.description delegate:nil cancelButtonTitle:#"on" otherButtonTitles:nil];
[alert show];
}];
I want to use AFNetworking 2.x.x in my project. But I am not able to do it with this new version.
I have subclass AFHTTPRequestOperationManager. I search internet and people suggest me to use AFJSONRequestSerializer. All other code is very similar. But than also I am getting bad request error.
So how can I send raw JSON string in with POST method in AFNetworking 2.x.x?
EDIT
Code for AFNetworking 2.X.X
Error Status : 404 Bad Request
Response :
{"name":"MALFORMED_REQUEST","message":"The request JSON is not well formed.","information_link":"https://developer.paypal.com/docs/api/#MALFORMED_REQUEST","debug_id":"ab3c1dd874a07"}
I am getting proper response by using Postman as shown in following screenshot.

Answer 1

So finally I got answer. I use subclass of AFHTTPSessionManager to implement API in my project. And use it with singleton object. So this is my singleton method.
+ (MASWebService *)APIClient
{
static MASWebService *_sharedClient = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^
{
NSURL *baseURL = [NSURL URLWithString:BaseURL];
NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
_sharedClient = [[MASWebService alloc] initWithBaseURL:baseURL sessionConfiguration:config];
_sharedClient.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
_sharedClient.requestSerializer = [AFJSONRequestSerializer serializer];
[_sharedClient.requestSerializer setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
});
return _sharedClient;
}
The main key line is setting Request Serializer HTTP Header "Content-Type" to "application/json"
If you are not subclassing AFHTTPSessionManager and using AFHTTPRequestOperationManager for single request than also it will work because AFHTTPRequestOperationManager is also conform to AFURLRequestSerialization protocol as property of AFHTTPRequestSerializer. I have not done it but it should look like this.
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
NSDictionary *parameters = #{#"foo": #"bar"};
manager.responseSerializer = [AFJSONResponseSerializer serializerWithReadingOptions:NSJSONReadingAllowFragments];
manager.requestSerializer = [AFJSONRequestSerializer serializer];
[manager.requestSerializer setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[manager POST:#"http://example.com/resources.json" parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"JSON: %#", responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Error: %#", error);
}];
I hope this will work. Inform me in comment if I am wrong somewhere.
Source : AFNetworking 2.0 POST request working example code snippet

Answer 2

So how can I send raw JSON string in with POST method in AFNetworking 2.x.x?
I had the same issue when trying to use SOAP+XML data with AFHTTPRequestOperationManager. Apparently the request serializer should be subclassed to make provision for your special serialisation needs, but this way seems easier:
NSError *error = nil;
NSData *envelopeData = [NSJSONSerialization dataWithJSONObject:params options:options error:nil];
NSMutableURLRequest *request = [self.requestSerializer requestWithMethod:#"POST"
URLString:path
parameters:nil
error:&error];
// In my case, I also needed the following:
// [request setValue:action forHTTPHeaderField:#"SOAPAction"];
[request setHTTPBody:envelopeData];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] init];
operation = [self HTTPRequestOperationWithRequest:request
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
// parse response here
}
failure:^(AFHTTPRequestOperation *operation, NSError *error)
{
// parse response here
}];
It hijacks the request serialiser that is created by AFHTTPRequestOperationManager, inserts the parameter data into the HTTP body, and then passes this new request into the AFHTTPRequestOperation.