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// GET
NSURL *URL                      = [NSURL URLWithString:@"http://example.com/resources/123.json"];
AFHTTPSessionManager *manager   = [AFHTTPSessionManager manager];
[manager    GET:URL.absoluteString 
    parameters:nil 
    progress:nil 
    success:^(NSURLSessionTask *task, id responseObject) {
        NSLog(@"JSON: %@", responseObject);
    } 
    failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }
];


// POST
NSURL *URL                      = [NSURL URLWithString:@"http://yoururl"];
AFHTTPSessionManager *manager   = [AFHTTPSessionManager manager];
[manager POST:URL.absoluteString
   parameters:@{    
                @"key1":@"val1",
                @"key2":@"val2"
                }
    progress:nil
    success:^(NSURLSessionTask *task, id responseObject) {
        //NSLog(@"JSON: %@", responseObject);
    }
    failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }
    ];
};

// For POST you can set up Timeout 

// POST
NSURL *URL                      = [NSURL URLWithString:@"http://yoururl"];
AFHTTPSessionManager *manager   = [AFHTTPSessionManager manager];
[manager.requestSerializer setTimeoutInterval:300]; // set up time out as 5 mins
[manager POST:URL.absoluteString
   parameters:@{    
                @"key1":@"val1",
                @"key2":@"val2"
                }
    progress:nil
    success:^(NSURLSessionTask *task, id responseObject) {
        //NSLog(@"JSON: %@", responseObject);
    }
    failure:^(NSURLSessionTask *operation, NSError *error) {
        NSLog(@"Error: %@", error);
    }
    ];
}