An AFHTTPClient subclass that works around the NSURLConnection caching bug in iOS 6.

HMHTTPClient.h

//
//  HMHTTPClient.h
//
//  Created by Hesham Abd-Elmegid on 4/10/13.
//  Copyright (c) 2013 Startappz. All rights reserved.
//

#import "AFHTTPClient.h"

@interface HMHTTPClient : AFHTTPClient

@end

HMHTTPClient.m

//
//  HMHTTPClient.m
//
//  Created by Hesham Abd-Elmegid on 4/10/13.
//  Copyright (c) 2013 Startappz. All rights reserved.
//

#import "HMHTTPClient.h"

@implementation HMHTTPClient

- (void)getPath:(NSString *)path
     parameters:(NSDictionary *)parameters
        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    NSMutableURLRequest *request = [self requestWithMethod:@"GET" path:path parameters:parameters];
    [request setCachePolicy:NSURLRequestReturnCacheDataElseLoad];
    AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
    [self enqueueHTTPRequestOperation:operation];
}

- (void)postPath:(NSString *)path
      parameters:(NSDictionary *)parameters
         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    NSMutableURLRequest *request = [self requestWithMethod:@"POST" path:path parameters:parameters];
    [request setCachePolicy:NSURLRequestReturnCacheDataElseLoad];
  AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
    [self enqueueHTTPRequestOperation:operation];
}

- (void)putPath:(NSString *)path
     parameters:(NSDictionary *)parameters
        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    NSMutableURLRequest *request = [self requestWithMethod:@"PUT" path:path parameters:parameters];
    [request setCachePolicy:NSURLRequestReturnCacheDataElseLoad];
	AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
    [self enqueueHTTPRequestOperation:operation];
}

- (void)deletePath:(NSString *)path
        parameters:(NSDictionary *)parameters
           success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
           failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    NSMutableURLRequest *request = [self requestWithMethod:@"DELETE" path:path parameters:parameters];
    [request setCachePolicy:NSURLRequestReturnCacheDataElseLoad];
	AFHTTPRequestOperation *operation = [self HTTPRequestOperationWithRequest:request success:success failure:failure];
    [self enqueueHTTPRequestOperation:operation];
}

- (AFHTTPRequestOperation *)HTTPRequestOperationWithRequest:(NSURLRequest *)urlRequest
                                                    success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success
                                                    failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure
{
    AFHTTPRequestOperation *operation = [super HTTPRequestOperationWithRequest:urlRequest success:success failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        if (error.code == kCFURLErrorNotConnectedToInternet) {
            NSCachedURLResponse *cachedResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:urlRequest];
            if (cachedResponse != nil && [[cachedResponse data] length] > 0) {
                id JSON = [NSJSONSerialization JSONObjectWithData:cachedResponse.data options:0 error:&error];
                success(operation, JSON);
            } else {
                failure(operation, error);
            }
        } else {
            failure(operation, error);
        }
    }];
    
    return operation;
}

@end

When i disable WIFI on my iPad, the errorCode is kCFURLErrorCannotConnectToHost and not kCFURLErrorNotConnectedToInternet...
Do we need to manage other errorCode for a more robust solution ?